FARM ADVISOR AND SPECIALIST VARIETY TRIALS IN THE SAN JOAQUIN VALLEY

University of California California Cotton Review The Newsletter of the UC Cooperative Extension Cotton Advisors Volume 53 January 2000 In This Issue Farm Advisor and Specialist Trials in the San Joaquin Valley Trial Information / UCCE Cotton Web Site Winter Cotton Production Meeting Announcement Conservation Tillage Meeting Announcement Visit our web site at: cottoninfo.ucdavis.edu Cooperative Extension FARM ADVISOR AND SPECIALIST VARIETY TRIALS IN THE SAN JOAQUIN VEY Bob Hutmacher, Ron Vargas, Bill Weir, Steve Wright, Bruce Roberts, Dan Munk, Brian Marsh, Mark Keeley, Raul Delgado The variety picture for CA cotton certainly became much more complicated for the 1999 season, with relatively large acreages planted with Approved Acalas, Approved Pimas, CA Uplands, CA Pima and experimental varieties. This first full year of such broad options also meant a much more complex set of variety trials. We will attempt, in this issue of the California Cotton Review to summarize results from the trials in which the University of CA has a primary role. There certainly is additional data also available from the seed companies, as well as individual growers who were doing their own comparisons this past year. All available sources of information should prove useful in making informed and reasonable choices on how much of your acreage to devote to each variety. Approach Used in Determining Entries in Trials. Approved Acala Trials. These tests were conducted by UCCE Farm Advisors and Extension Specialist and staff to provide continuing large-scale evaluations of some varieties already approved by the San Joaquin Valley Cotton Board (SJVCB). Tests were supported by a grant from the State Support Committee of Cotton Incorporated. It is important to note that not all varieties currently approved for the SJV are in these approved trials. In Acala tests, entries included varieties newly-approved by SJVCB for the current year, varieties released last year that are in their second year of testing, plus the top 6 or 7 previously-approved varieties (in terms of planted acreage). New varieties are the focus of tests, but only remain in the tests for the first two years following release unless the variety moves into the top 6 or 7 varieties in planted acreage. Some exceptions to this rule were made based upon recommendations of individual seed companies that some varieties are for limited markets or varieties they see as of declining interest. For some of these reasons, you will not see recent yield results for varieties such as DP-6100, CPCSD-NemX, CPCSD Acala Royale or Germain s GC-510. In each case, more recently-released varieties have been substituted in the tests even if actual planted acreage is smaller. After consulting with some grower representatives of the Cotton Incorporated State Support Committee, we decided to also include two CA Upland varieties (DPL- Nucotton-33B and Stoneville BXN-47) in the Approved Acala tests in order to provide more locations for comparison of specific CA Upland varieties with Approved Acalas. Approved Pima Trials. The approach for Pima varieties has been similar, but fewer entries are retained in the tests than in Acala trials. Some varieties have lower long-term yield performance (such as S-6) and have been excluded from most tests to avoid yield losses in grower fields. Other varieties (such as Conquistador and Oro Blanco) are grown on such limited acreage, they were not retained in 1999 tests in order to keep experiment size manageable for the very limited funds available for these tests. California Upland Trials. A testing program was initiated in 1999 (with financial support from participating seed companies). Two specific testing programs were initiated: (1) a multi-county

(6 location) study with large field plots in grower fields (hereafter referred to as the CA Upland Large-Scale test), and (2) a smaller-scale study (3 locations, small field plots 50-75 feet in length) for screening purposes (hereafter called the Advanced Strains CA Upland test). Seed companies were allowed a maximum of 2 entries per company in the Large-Scale trials, and 3 entries in the Advanced Strains trials. The choice of varieties entered was made by the seed companies. For comparison purposes, two Acala varieties (CPCSD Maxxa and Phytogen-33) were included in these tests. Measurements and Sampling. All plots were machine harvested for yield measurements, with six pound seedcotton samples ginned at Shafter REC. Fiber samples were sent to the USDA Classing Office for HVI fiber quality analyses. Twentyfive plants were evaluated per replication in several varieties in each test for presence/absence of vascular streaking and leaf discoloration as an index of incidence of Verticilium wilt. Although incidence of Verticilium wilt was very limited in the Approved Acala and most CA Upland tests in 1999, these evaluations were still done. Since the Verticilium wilt tolerance of non-acala Uplands is either not known or less than in most Acala varieties, evaluations were also done on BXN-47 and Nucotton-33B. This data has also not yet been summarized. The incidence of Verticilium wilt was generally quite low in these test locations, but additional comments will be withheld until evaluations from each site are fully analyzed. This information, plus lint quality HVI data, and information on soil types, location and management at all test sites will be available in mid-february at the University of CA Cooperative Extension cotton website "cottoninfo.ucdavis.edu" (see Announcement on the last page of this publication). UCCE Approved Acala Trials Ten approved Acala varieties plus two California Upland varieties (for comparison) were planted in "Approved Acala" tests in 1999. Varieties included are shown in Table 1. California Upland varieties included in all but one test location (Kings County) were DPL Nucotton- 33B and Stoneville BXN-47. Tests were located in each of the six San Joaquin Valley cotton-producing counties, plus the Shafter and West Side Research and Extension Centers of the University of CA. Tests in grower fields were large, with individual entries grown in 6 to 8 row width plots averaging 1000 to 1300 feet or more in length. Studies had 4 replications in randomized complete block designs. Studies at West Side and Shafter locations were smaller, with plots 4 rows in width by 300 feet length. Planting dates, soil type and management practices varied across the locations and with grower differences in inputs and management approach. Lint yields in the Approved Acala variety trials in 1999 averaged 1552 lbs/acre (in the 7 locations with all 12 entries). In comparing across recent years in the UCCE Approved Acala trials, 1999 averages were 42% higher than the 1092 lbs/acre average of 1998, 66% higher than the 1995 average (935 lbs/acre), 15% higher than the 1996 average (1353 lbs lint/acre), and 2% higher than the 1997 average (1525 lbs/acre). The average yields across farm locations in these variety trials is almost 280 lbs/acre higher than the USDA estimates for statewide average yields (about 1272 lbs/acre in CDFA/USDA estimates of December 17. Statistical separation of variety yields is indicated by the LSD (least significant difference) test results. Lint yields and gin turnouts which are separated by the amount shown in the LSD column (or more) were statistically different. Acala Varietal Performance and Comparison with Two CA Uplands. Looking across the 7 locations where there was a CA Upland / Acala comparison, and the 8 locations comparing Acala entries, two varieties had statistically higher yields than Maxxa (Table 1). BXN-47 yields were 6.0 percent (93 lbs/acre) higher than Maxxa, while GTO Maxxa yields were 3.7 percent (58 lbs/acre) higher than Maxxa. GC-500 was 2.2 percent (34 lbs/acre) higher, DP-6207 yields were 1.7 percent (26 lbs/acre) higher than average Maxxa yields, and Phytogen-33 yields were 1.0 percent (15 lbs/acre), but these were not statistically different. All other varieties produced 94 to 99 percent of Maxxa yields. Compared with the relative yield performance of several CA Upland varieties (relative to Maxxa and other Acalas) in the 1998 trials (when some CA Upland entries outyielded Acala standards by 10 to 30 percent), the yields of the two CA Upland entries in these 1999 tests were within +/- 6 percent of the Maxxa standard Acala variety in 1999. Gin turnouts were moderate compared with recent years, with an average over locations and varieties being 34.9 percent in 1999 versus 32.6 percent (1998) and 36.2 percent (1997). California Cotton Review Page 2

Table 1. Lint yields, gin turnouts, statistical analyses in 1999 Acala Approved Trials (10 Approved Acala entries plus two CA Upland varieties (DPL-Nucott-33B and BXN-47 for comparison) at only 7 of the original 8 locations). Data shown for Acala entries is for all 8 locations, and statistics shown are for the 12-variety tests, with the exception of Kings County. Seed Company 40 Shafter 40 West Side 40 Kern 40 Kings 38 Tulare 38 Fresno 30 Madera 30 Merced Lint (lbs /ac) Lint Mean Gin T.O. CPCSD Maxxa 1401 1767 1606 1525 1446 1238 1792 1654 1554 100 35.7 CPCSD GTO Maxxa 1593 1775 1655 1590 1508 1352 1718 1702 1612 103.7 38.7 Phytogen Phy-33 1450 1816 1638 1669 1373 1395 1575 1638 1569 101.0 33.5 Delta Pine &Land DP-6211 1461 1734 1643 1522 1362 1290 1645 1613 1534 98.7 35.5 CPCSD SJ-2 1527 1732 1621 1402 1302 1282 1661 1605 1517 97.6 32.1 Germains GC-500 1410 1804 1719 1631 1389 1303 1683 1762 1588 102.2 36.6 CPCSD C-141 1433 1703 1553 1545 1394 1288 1635 1566 1515 97.5 34.6 Delta Pine DP-6207 1383 1801 1683 1663 1364 1369 1683 1694 1580 101.7 34.7 Buttonwillow BR-9605 1438 1702 1619 1545 1473 1344 1636 1585 1543 99.3 35.0 CPCSD C-166 1559 1647 1613 1289 1589 1119 1547 1646 1501 96.6 34.8 Delta Pine &LandCo Nucott- 33B 1430 1824 1698 **(not in test) 1251 1346 1406 1337 ** (not calc.) 94.4 7-site ave 32.4 Stoneville Seed BXN-47 1444 1960 2022 **(not in test) 1377 1430 1674 1651 ** (not calc.) 106.0 7-site ave 34.5 1461 1772 1673 **1538 (7-site) 1402 1313 1638 1621 1552 34.9 LSD 0.05 110 76 68 58 (7-site) 81 144 125 183 52 0.3 C.V. (%) 6.3 3.0 2.8 2.6 4.0 7.6 5.3 7.8 6.1 1.8 P 0.061 0.000 0.000 0.000 0.000 0.015 0.000 0.013 0.000.000 LSD = least significant difference between yields required to be significantly different at the 5% level of signficance; C.V. = coefficienct of variation; P = probability VARIETY by LOCATION (for yields): (LSD 0.05 = 136; C.V. (%) = 6.3; P = 0.000) ** no DPL Nucotton-33B or Stoneville BXN-47 at Kings site, therefore, no overall average calculated, just 7-site average for % of Maxxa yield Long-Term Evaluations and Comparisons. In order to keep yield data in perspective, it is useful to look at the long term, relative yield performance of varieties. Table 2 shows lint yields Maxxa standard) during the period from 1994 through 1999 using combined data from UCCE Farm Advisor trials plus San Joaquin Valley Cotton Board tests (see Table caption for more information). In addition, available yields (shown as % of Maxxa yield) over the 1994 through 1999 period are shown in Table 2 with data separated into averages for south SJV (Shafter, Kern and Tulare data), central SJV (Fresno and Kings data), and north SJV (Madera and Merced data). Although this grouping is somewhat arbitrary, this analysis still indicates that the relative ranking of varieties can vary across the SJV, and growers may want to look carefully at location differences in evaluating variety performance data from UCCE and the San Joaquin Valley Cotton Board (SJVCB). Earlier copies of Approved trials and SJVCB results can be reviewed to provide actual yield data by locations. California Cotton Review Page 3

Table 2. Lint yields of Approved Acala varieties (1994-1999) Maxxa yield). Values were determined from data from 7 to 8 locations per year in either Farm Advisor trials or SJVCB trials. Values shown in italics and outlined are from San Joaquin Valley Cotton Board tests in years prior to approval of variety. All other values shown were determined in multi-location "Approved Acala" variety trials of the University of CA Cooperative Extension Farm Advisors and Specialist. "Blank" areas in the table indicate that the varieties were not included in tests (either because they were not yet released (more recent varieties) or because acreage was limited and earlier testing had been done (older varieties). 1994 Lint s 1995 Lint s 1996 Lint s 1997 Lint s 1998 Lint s 1999 Lint s Shafter, Kern & Tulare County s 1994-1999 WSREC Fresno & Kings County s 1994-1999 Madera and Merced County s 1994-1999 Maxxa 100 100 100 100 100 100 100 100 100 100 GC-510 94 91 93 92 93 96 * 93 * 89 * 93 * Royale 96 94 96 97 97 103 * 97 * 91 * 96 * SJ-2 94 99 99 97 98 98 102 95 96 98 Phytogen- 33 All Sites s 1994-1999 97 102 102 103 105 101 108 101 95 102 GC-535 95 97 97 97 99 100 * 99 * 92 * 97 * DP-6204 96 93 97 95 99 101 * 97 * 89 * 96 * DP-6211 104 103 104 99 106 * 103 * 98 * 103 * DP-6207 104 106 102 106 * 104 * 101 * 104 * DP-6166 96 89 97 * 95 * 88 * 93 * CPCSD C-141 GTO Maxxa 99 103 98 102 98 103 * 103 * 95 * 100 * 104 102 106 104 104 107 * 107 * 98 * 104 * GC-500 94 93 99 100 102 100 * 97 * 96 * 98 * GC-717 99 97 89 94 101 * 97 * 90 * 95 * El Dorado 91 96 97 96 * 98 * 89 * 95 * GC-703 97 95 87 94 * 95 * 88 * 93 * GC-702 99 95 108 * 98 * 93 * 97 * BR-9605 98 97 100 101 * 98 * 95 * 98 * CPCSD C-166 96 89 97 97 * 91 * 93 * 94 * CB-305 ** 98 106 113 * 101 * 99 * 102 * CPCSD Prema 91 96 * 92 * 87 * 91 * DP-6100 90 94 * 100 * 82 * 90 * Kings Acala 91 97 * 92 * 86 * 91 * in tests - in lbs lint/a 1227 935 1354 1482 1092 1551 California Cotton Review Page 4 * = less than 6-years test results; ** = variety no longer available

UCCE Approved Pima Tests Objectives of Pima studies were also to evaluate approved varieties under different environmental conditions and management. The number of test locations was expanded considerably in 1998 and 1999 in response to increasing Pima plantings and the need for a broader base of information on varietal performance. Pima variety trials had limited financial support in 1999, supported largely from general research funds of UCCE Specialists and Farm Advisors, and in part through grants from the California Crop Improvement Association. Two test locations (Shafter and West Side Research and Extension Ctrs. of the Univ. of CA) were used with 8 varieties in the 1999 trials, plus four additional locations where growers agreed to include 6 varieties. The four large-scale test sites were on grower-cooperator locations in Kern, Kings, Fresno and Merced counties. Approved Pima varieties included in the tests are shown in Tables 3 and 4. The Fresno County site is separated in the results due to the test location at a a site with significant soil salinity problems, and the large differences across replications within that test (note high C.V. (Coefficient of Variation) at that test location, Table 4). Results for the six varieties grown at five locations are shown in Table 3, data for the eight varieties at two locations in Table 4, and yields at the Fresno County saline site are in Table 4. Table 3. Lint yields (in lbs/acre) by test location and average gin turnout for each variety in 1999 Pima Approved Trial (5 locations with 6 varieties evaluated). Seed Company Shafter REC West Side REC ** Kern ** Kings Merced Lint (lbs lint / acre) Lint (as % of S-7) Gin Turnout ( % ) Public S-7 1189 1828 1473 1146 1086 1344 100 32.4 Delta Pine & Land Company Buttonwillow Research DP-HTO 1048 1868 1413 1050 978 1271 95 35.1 CH-252 1065 1468 1205 847 724 1062 79 32.6 Phytogen Phytogen-57 1192 1610 1556 1102 1065 1305 97 30.9 Delta Pine & Land Company University of Arizona DP-White Pima 1238 1824 1530 1224 1041 1371 102 32.5 UA-4 1193 1859 1267 1171 664 1231 92 33.5 1154 1743 1407 1090 926 1264 94 32.8 LSD 0.05 135 176 122 51 92 62 0.3 C.V. ( % ) 7.8 6.7 5.7 3.1 6.6 7.3 1.5 P 0.045 0.001 0.000 0.000 0.000 0.000 0.000 VARIETY by LOCATION interaction (for yields): (LSD 0.05 = 159; C.V. (%) = 8.9; P = 0.000) ** = includes first and second picks at these sites Across all locations and varieties, 1195 lbs of lint per acre were produced in the Pima Approved Trials this year, compared with 791 lbs/acre (1998), 1703 lbs/acre (1997) and 1256 lbs/acre in 1996 trials. Planting dates in 1999 trials ranged from April 12 to April 27, and plants in most locations suffered from delayed development and flowering due to cool conditions that prevailed into mid-june. Pest problems (lygus in some locations, spider mites in three sites) were causes of moderate early and mid-season losses in at least three locations. Data from multiple years should be considered in making variety choices, as one year s data may not represent long-term performance. For instance, CH-252 performance in yield tests has been similar to S-7 in many locations and numerous years prior to 1999, but 1999 yields were significantly lower. More complete comparisons of varietal yield performance across different years (1992 through 1999) will be available later in February, 2000 at the University of CA cotton web site previously mentioned. California Cotton Review Page 5

Table 4. Lint yields (in lbs/acre) by test location and average gin turnout for each variety in 1999 Pima Approved Trial at West Side REC and Shafter REC (2 locations with 8 varieties evaluated) plus Fresno County location (saline site with 6 varieties evaluated). Seed Company Shafter REC West Side REC * Mean Lint (lbs lint / acre) Ave. Lint (as % of S-7) Gin Turnout ( % ) Fresno County Lint (lbs / acre) Fresno Gin Turnout ( % ) Public DeltaPine & Land Co Buttonwillow Research S-7 1189 1828 1509 100 32.2 827 33.5 DP-HTO 1048 1868 1458 97 34.9 924 36.6 CH-252 1065 1468 1267 84 32.5 674 33.9 Phytogen Phy-57 1192 1610 1401 93 30.6 928 33.2 Delta Pine & Land Co DP-White Pima 1238 1824 1531 101 31.9 1140 33.9 University Of Arizona UA-4 1193 1859 1526 101 33.0 616 35.2 Phytogen Conquistador 1193 1813 1503 100 31.1 Public S-6 981 1456 1219 81 33.1 1137 1597 1367 32.4 852 34.4 LSD 0.05 165 147 101 0.6 278 1.1 C.V. ( % ) 9.8 6.3 7.1 1.6 21.6 2.1 P 0.036 0.000 0.000 0.000 0.013 0.000 VARIETY by LOCATION interaction (for yields at Shafter and WSREC sites): (LSD 0.05 = NS; C.V. (%) = 11.0; P = 0.118) * = first and second picks included at this site UCCE CA Upland Tests Objectives in these trials were to begin to develop a University of CA data base on yield performance and quality characteristics of CA Upland varieties now available to CA growers. The purpose of the two tests ( CA Upland Large- Scale versus Advanced Strains tests) and for including two Acala entries (CPCSD Maxxa and Phytogen-33 ) in the tests was to get a broad range of varieties in replicated tests, continuing and expanding the comparisons initiated by the San Joaquin Valley Cotton Board in the 1998 so-called Barn-Burner tests. In reviewing the data, it is important to take note of several things: (1) this is one-year data for the 1999 season; (2) data in Table 5 is from the Large Scale trial, with large tests in grower fields; (3) data in Table 6 is from the Advanced Strains tests (small plots at only three locations). As stated previously, until more is known regarding long-term yield performance, quality characteristics and Verticilium resistance, some caution should be exercised in interpreting this year s yield data, and growers should also consult other available sources of data on these varieties. We felt it was important to include data from both Large Scale and Advanced Strains trials this year, since any of these varieties could be brought into CA if seed companies make them available. Although relative performance of varieties (yield ranking relative to other varieties) was fairly consistent across locations in many entries in the Large California Cotton Review Page 6

Scale test, it is worth noting the great variability in relative ranking of varieties (by yield) in the Advanced Strains trials, where Acala entries were near the bottom in yield ranking at two of the sites, but at the top at the third site. More complete comparisons of varietal yield performance across different years (1998 in SJVCB trials versus 1999) will be available later in February, 2000 at the University of CA web site previously mentioned. Table 5. Lint yields (in lbs/acre) by test location and average gin turnout for each variety in 1999 California Upland LARGE SCALE Trial (6 locations with 1 Acala variety ( and 17 California Upland varieties, with 2 additional varieties (Phytogen-33 (Acala) and GC-204 (CA Upland) missing from one location each. Company / Kern Kings *** Tulare ** Fresno Madera Merced *** Mean Lint (lbs lint / acre) Mean Lint (as% of Mean Gin Turnout ( % ) CPCSD Maxxa 1450 1679 1261 1304 1078 1396 1361 100 35.3 Phytogen 33 1379 *** 1292 1552 967 1271 *** not calc. 99.4 5-site avg AgrEvo Fiber-Max 989 1216 1840 1003 1246 1087 1226 1270 93.3 33.5 AgrEvo ACSI IF-1000 1288 1849 1278 1297 1001 1262 1329 97.6 33.7 AgriPro AP 6101 1264 1613 880 1759 947 1185 1275 93.7 32.4 AgriPro AP 7115 1455 1844 991 1409 1149 1336 1364 100.2 33.9 Stoneville BXN47 1480 1849 1004 1178 1236 1362 1352 99.3 33.3 Olvey & Assoc.. OA-36 1218 1606 1169 1471 1080 1208 1292 94.9 33.4 Buttonwillow BR-C9801 1296 1622 1246 1575 992 1184 1319 96.9 32.7 Buttonwillow BR-C9802 1333 1743 1490 1578 1154 1312 1435 105.4 31.9 Paymaster PM-1560BG 1377 1616 1286 1564 1149 1254 1374 101.0 33.6 Phytogen PSC-413 1335 1659 1243 1219 946 1148 1258 92.4 32.5 Phytogen GA-161 1298 1605 988 1303 1022 1100 1219 89.6 32.2 Delta Pine NuCotton 33-B 1254 1907 843 1434 972 1118 1255 92.2 31.4 Delta Pine 448-B 1416 1768 1157 1742 1234 1273 1432 105.2 32.8 Suregrow SG-747 1389 1738 967 1852 1187 1186 1387 101.9 33.6 Suregrow SG-501 1462 1770 1254 1865 1109 1354 1469 107.9 35.3 Helena Cotton HCR-9220 1385 1650 1002 1494 1004 1271 1301 95.6 33.0 32.1 Helena Cotton HCR-7114-46 1277 1680 1145 1549 1184 1163 1333 97.9 34.0 Germains GC-400BG 1331 1698 769 1510 1054 1130 1249 91.8 32.8 Germains GC-204 1332 1645 1264 1476 1117 *** *** not calc. 1343 1723 (no Phy-33) 1104 1492 1083 1235 (no GC-204) 101.4 5-site avg. 30.3 1260 33.2 LSD 0.05 (6 county aver.) 99 165 227 308 168 114 86 0.8 C.V. ( % ) (6 county aver.) 4.5 5.8 12.4 12.5 9.4 5.6 9.5 3.4 ** this location includes first and second picks *** no Phy-33 at Kings location, no Germains GC-204 at Merced site, therefore, no overall average calculated, just 5-site average for % of Maxxa yld.variety by LOCATION interaction (for yields): (LSD 0.05 = 126; C.V. (%) = 11.3; P = 0.002) California Cotton Review Page 7

Table 6. Lint yields (in lbs/acre) by test location and average gin turnout for each variety in 1999 California Upland Advanced Strains Trial (3 locations with 2 Acala varieties [Maxxa and Phytogen-33] and 26 California Upland varieties). Seed Company Shafter REC West Side REC Merced County Site Lint (lbs lint / acre) Lint Maxxa ) Shafter West Side Merced 3- loc. REC REC Avg. Gin Turnout CPCSD Maxxa 1265 1662 1832 1586 100 100 100 100 36.5 Phytogen Phy-33 1549 1746 1873 1722 122 105 102 109 34.1 AgrEvo ACSI Expo-223 1450 2020 1658 1709 115 122 91 108 36.5 AgrEvo ACSI Expo-052 1573 2081 1876 1843 124 125 102 116 36.6 AgrEvo ACSI Expo-781 1440 1748 1772 1653 114 105 97 104 36.2 AgriPro APX-9257 1570 2046 1709 1775 124 123 93 112 35.4 AgriPro APX-7126 1473 1939 1543 1652 116 117 84 104 36.0 AgriPro AP-6102 1484 1944 1588 1672 117 117 87 105 34.2 Olvey & Assoc OA-77 1555 1951 1705 1737 123 117 93 110 34.6 Olvey & Assoc OA-66 1307 1882 1596 1595 103 113 87 101 33.9 Buttonwillow BR-9904 1344 2043 1690 1693 106 123 92 107 32.9 Buttonwillow BR-9905 1404 1898 1835 1712 111 114 100 108 33.4 Buttonwillow BR-9906 1681 1821 1779 1761 133 110 97 111 32.2 Paymaster PM-1560 BG/RR 1346 1765 1601 1571 106 106 87 99 34.7 Phytogen PSC-355 1437 1850 1635 1641 114 111 89 104 34.0 Phytogen HS-12 1402 1858 1439 1566 111 112 79 99 34.0 Phytogen PSC-952 1394 1881 1590 1621 110 113 87 102 34.1 Delta Pine Topaz 1371 2050 1709 1710 108 123 93 108 36.1 Delta Pine Pearl 1442 1828 1595 1622 114 110 87 102 35.6 Suregrow SG-105 1583 2090 1643 1772 125 126 90 112 34.5 Suregrow SG-821 1478 2111 1738 1776 117 127 95 112 35.0 Helena Cotton HCR-9240 1732 1828 1693 1751 137 110 92 110 35.4 Helena Cotton HCR-9310 1394 1696 1349 1480 110 102 74 93 33.4 Helena Cotton HCR-9263 1440 1805 1556 1600 114 109 85 101 35.0 Germains GC-9810 1586 1856 1531 1657 125 112 84 105 33.4 Germains GC-9811 1571 1933 1599 1701 124 116 87 107 35.1 Germains GC-9812 1704 1974 1645 1774 135 119 90 112 33.6 Pure Genetics VT-901 1476 2022 1813 1770 117 122 99 112 32.7 1480 1905 1664 1683 34.6 LSD 0.05 NS 190 217 111 0.5 ( % ) C.V. ( % ) 3-county analysis 13.9 7.1 9.3 8.1 1.8 VARIETY by LOCATION interaction (for yields): (LSD 0.05 = NS; C.V. (%) = 13.4; P = 0.571) California Cotton Review Page 8

Information on San Joaquin Valley Cotton Board Results and Lint Quality Information on all 1999 Trials Another issue of the California Cotton Review will be published during the month of February, 2000. It will include information on several important topics that would not fit into this variety trial issue, including: trial results from the San Joaquin Valley Cotton Board (both Pima and Acala tests) Lint quality (HVI data) on the variety trials covered in this January issue (Approved Acala, Approved Pima, and CA Upland variety trials) 1999 Growing season review (weather and crop yield summary, pest assessment, acreage figures) Some of this information scheduled for the February issue will be available also on the new University of CA cotton web site (cottoninfo.ucdavis.edu) as early as mid-february (see ANNOUNCEMENT section below). ANNOUNCEMENTS VARIETY TRIAL INFORMATION / UCCE COTTON WEB SITE. trial information from this year s Approved Acala, Approved Pima and CA Uplands trials will be some of the first information to be put on the new University of CA cotton web site. The basic yield information presented in this issue of the CA Cotton Review should be available starting about February 10, with the HVI quality information following within about a week or less. UCCE staff intend to develop this site over the course of the year to include more information and updates useful to growers / PCA s. It already has recent issues of the CA Cotton Review, Field Check, and Quick Check posted: The web site address is: cottoninfo.ucdavis.edu Please call Brian Marsh (661) 868-6210 or Bob Hutmacher (661) 746-8020 with questions. WINTER COTTON PRODUCTION MEETING FEBRUARY 16. The CA Cotton Growers Association Annual Meeting will again be held in conjunction with the University of CA Cooperative Extension Winter Cotton Production Meeting on Wednesday, February 16 th at the Visalia Convention Center. Please contact your Farm Advisor for details, or register by FAX to the CCGA office (FAX: (559) 252-0551). See you there! CONSERVATION TILLAGE MEETING focus is on Conservation Tillage Success Stories from around the U.S. Speakers from industry and research in CA as well as many other states. Thursday (Feb. 10), 8:30 4:00 (West Side REC, Five Points) Ph: (559) 884-2411. Friday (Feb. 11), 8:30 4:00 (Western Ctr. For Agric. Exper., Davis) Ph: (530) 752-0516.. SPECIAL THANKS to the many growers, seed companies and others who helped in these variety trials and our other field studies in 1999. The variety trials took up a lot of space and required our cooperators to change many Support for this publication is provided by California Cotton Growers through their Cotton Incorporated State Support Program. California Cotton Review Page 9

Disclaimer Discussion of research findings necessitates using trade names. This does not constitute product endorsement, nor does it suggest products not listed would not be suitable for use. Some research results included involve use of chemicals which are not currently registered for use, or may involve use which would be considered out of label. These results are reported but are not a recommendation from the University of California for use. Consult the label and use it as the basis of all recommendations. The University of California Cooperative Extension Cotton Advisors and Specialists Web site: cottoninfo.ucdavis.edu Any individual requiring accommodations should contact the advisor in advance. Statewide Bob Hutmacher (661) 746-8020 Area Pete Goodell (559) 646-6515 Fresno Dan Munk (559) 456-7561 Kern Brian Marsh (661) 868-6210 Kings Bruce Roberts (559) 582-3211 Madera Ron Vargas (559) 675-7879 Merced Bill Weir (209) 385-7403 Tulare Steve Wright (559) 733-6482 Glenn Doug Munier (530) 865-1107 The University of California, in accordance with applicable Federal and State law and University policy, does not discriminate on the basis of race, color, national origin, religion, sex, disability, age, medical condition (cancer related), ancestry, marital status, citizenship, sexual orientation, or status as a Vietnam-era veteran or special disabled veteran. The University also prohibits sexual harassment. Inquiries regarding the University s nondiscrimination policies may be directed to the Affirmative Action Director, University of California, Agriculture and Natural Resources, 1111 Franklin Street, 6th Floor, Oakland, CA 94607-5200.