Archives

Identification and development of cotton germplasm and potential breeding lines with improved Fusarium wilt (FOV) resistance, fiber quality, and yield

 

OBJECTIVES (related to #(1) and #(2) above:
1. Develop cotton progeny and breeding populations segregating for FOV race 4 resistance. (approximately 2/3 of efforts will focus on Upland / Acala types of cotton, with remainder of effort on Pima germplasm).

For 2013 evaluations: Over 500 entries were sent from Mauricio Ulloa in Lubbock, TX representing populations derived from cooperative work with Bob Hutmacher and Steve Wright of UCCE in recent years. These entries were planted at one major field screening site for race 4 FOV in Tulare County, and evaluations of all entries were done in the summer and fall of 2013. For 2014 evaluations: Over 410 entries were sent from Mauricio Ulloa of USDA-ARS in Lubbock, TX representing populations of interest. All of the entries were planted at the Tulare County FOV screening site in May, 2014 and about half of the entries were also planted at the Kern County FOV screening site that we have developed

 

Download full copy of Research here

2014 Verticillium Wilt resistance of cotton germplasm

 

Objectives of Research:
The overall objective of this research was to identify and utilize field screening locations with a moderate to high level of sustained Verticillium wilt inoculum to provide a location for field screening of cotton germplasm of interest in CA Cotton production. The aim of the work is to utilize locations with a Verticillium wilt population for field screenings to identify relative susceptibility of newer commercial varieties of interest for CA Cotton production, and to then screen experimentals from both commercial breeders or seed companies plus those from USDA-ARS or other public breeding programs…

Download full copy of Research here

2014 Field Evaluation Support and Variety Screening Evaluations

 

PROJECT SUMMARY:
This project matches the efforts in a similar named project supported by the California Cotton Incorporated State Support Committee. The difference between the two is that the Cotton Incorporated part of the project is set up to support only Acala and Upland cultivar research, while the CA Cotton Alliance project supplements that support and also allows us to also focus on Pima variety screening and related efforts for Pima production. CA Cotton Alliance funds support the same areas of work as the Cotton Incorporated funded project, but since Cotton Incorporated funds are collected for Upland variety work, the expanded efforts in screening, including Pima, are covered under this same project summary report…

Download full copy of Research here

Assessment of Fusarium in SJV Cotton: Field Evaluation Support and Variety Screening Evaluations

 

PROJECT SUMMARY
In California, Fusarium wilt of cotton has been considered a potentially serious fungal disease caused by the organism Fusarium oxysporum vas infectum (also called “FOV”). However, in the past, damage associated with Fusarium in SJV cotton has been notable only in production areas with the combination of: (a) moderate to high populations of a specific race of FOV (usually race 1 ); (b) soils witl1 a sandy or sandy loam texture; and (c) root knot nematodes present in high-enough populations to cause significant galling and root damage. Past research generally indicated that FOV damage was worst when both FOV inoculum and nematodes were present in relatively higl1 concentrations. Methods used in the past to limit damage to cotton associated with Fusarium wilt have been to avoid planting cotton in soils in which the combination of sandy or sandy loam texture is combined with the presence of root knot nematode, or grow cotton only infrequently…

Download full copy of Research here

Assessment of Fusarium in the San Joaquin Valley: Field Evaluations and Variety Screening

 

Fusarium w.ilt of cotton in California has been considered a potentially serious fungal disease caused by the organism Fusarium oxysporum vas infectum (also called ”FOV”) for many decades in several areas of the San Joaquin Valley (SJV). In the past, however, damage associated with FOV in SJV cotton has been notable only in areas with the combination of: (a) moderate to high populations of one or more specific races of FOV (usually race 1 ); (b) soils with a sandy or sandy loam texture; and (c) where root lrnot nematodes were present in high-enough populations to cause some significant root damage. Past research generally indicated that FOV damage was worst when both FOV inoculum and nematodes were present in relatively high…

 

Download full copy of Research here