Project Summaries. Seed treatment evaluations were done in 2004 at Shafter and West Side REC test locations for several reasons:
(1) to have a California location to participate in tests done at a national level for new and continuing seed treatments for cotton as part of the National Standards Seed Trt Test; and
(2) for University of California trials on select treatments likely to be widely available, or under consideration for future use under CA cotton production conditions by several large seed treatment companies
Prior to 2001 , these trials were done in conjunction with CA Cotton Planting Seed Distributors and consulting Plant Pathologist Dr. Dick…
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The Gossypium hirsutum gene pool from Mexico encompasses a wide range of habitats and is one of the primary sources for improvement of most of the Acala and Upland cotton growing in the world today. Despite the existence oflarge collections of landraces of G. hirsutum, they are poorly evaluated and difficult to characterize for their value in
the collection and potential for cotton…
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Many Acala cottons go rank when over-irrigated, and the final yield is often less than maximum. Under-watering also reduces yield. The goal of this project was to find the depth of water application that would maximize yield. This is the end of the third season of an experiment in field 41A of the south 40, with 6 different application rates, using daily irrigation with a subsurface drip irrigation system. A RCB split plot design was used with 2 reps to compare Maxxa to PhytoGen-72. Each of the main treatment…
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Project Summary . This project at Shafter REC is part of a multi-location trial that has been conducted for over five years to evaluate the potential of a change in cotton planting configurations on growth, yield potential and quality. The bulk of the field evaluations in years prior to 2002 were done by two main groups: (1) Dr. Bill Weir of UCCE – Farm Advisor Emeritus from Merced County in cooperation with San Juan Ranch and Bowles Farms in western Merced County, and (2) trials conducted by Hntmacher, Keeley and Delgado with cooperation from staff for multiple years at Shafter…
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1. Abstract
Management of cotton root-knot nematode (Meloidogyne incognita) is essential in those areas that produce
cotton on sandy to sandy-loam soils. The primary management approach to root-knot nematode involves
cultural approaches including crop rotation and use of a resistant variety in Acala production. Chemical
approaches are limited but new products…
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Variety trial yield and fiber quality results are the focus of these trials conducted at both Shafter and West Side Research and Extension Centers. As the yield and fiber quality data for the current year does not become available until well after the field day, a listing is provided of both the entries included in the 2004 field trials as well as a data
summary of the 2003 efforts (provided as an example of ongoing data collected in this trial).
2004 Activities- at Shafter and West Side REC sites. This testing program was downsized to small plot trials at UC Shafter and UC West Side Research and Extension Centers…
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Justification and Problem Statement
Lygus hesperus continues to be one of the most damaging pests of cotton in the San Joaquin Valley. L. lineolaris, a
closely related species is quickly becoming the primary pest of cotton in the Southeast US. Current controls consist
ofthe application of broad spectrum pesticides that may also impact natural enemies. The depletion of natural
enemies may lead to increases of other pests such as aphids, whiteflies and spider mites later in the season. A
control that is selective for Lygus would be a benefit to the cotton industry. Both Lygus species are infected, in
nature, by a fungus called Beauveria bassiana. B. bassiana occurs worldwide, and is used commercially. Tests in
our laboratory and in published reports suggest that the commercial products are not very effective against either
Lygus species (Noma and Stickler 2000; Steinkraus and Tugwell 1997). Surveys for B. bassiana done in 2000-2002
revealed widespread prevalence of the fungus (McGuire 2002). B. bassiana was found in all SJV…
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The objectives of these studies with Acala and Pima varieties are to evaluate approved Acala varieties and Pima varieties submitted for testing under different environmental conditions and management across the San Joaquin Valley region of Califomia. In order to provide a reasonable limit on the number of varieties in the tests, the entries include newly-approved varieties (approved by the San Joaquin VaJJey Cotton Board) for the current year, varieties released last year that are in their second year of testing, plus the top 4 or 5 previously-approved varieties (in terms of planted acreage). The new varieties are the focus of tests, but only remain in tests for a minimum of two years following release unless that variety moves into the top 4 or 5 varieties in planted acreage. Released varieties also may…
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