Archives

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

Evaluation of Low Pressure Irrigation Systems (LPS) for Cotton in Reduced Tillage Systems

 

Recently, water, energy, fertilizer, pesticides, labor cost and the capital investment in modem irrigation systems have risen dramatically and at a rate greater than farmer returns. Studies have demonstrated that drip irrigation can improve water use efficiency, reduce fertilizer losses and reduce application of pesticides and fungicides, particularly when compared with flood, furrow and sprinkler irrigation. As drip irrigation knowledge has evolved, Netafim Irrigation has developed Low Pressure Systems (LPS) that operate at 3 psi pressure while achieving a distribution uniformity of 90% or better. The conversion of leveled furrow irrigated fields to LPS using pressurized district water eliminates additional energy expenditures. It also conserves significant water and energy and allows the use of low pressure components, thus reducing the capital inputs of LPS. Three years of…

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

Low Pressure Drip Irrigation

 

Maximizing application efficiency (Ae) of irrigation systems depends mostly on the irrigation manager’s ability to:

1. Reduce and/or eliminate runoff.
2. Reduce deep percolation below the root zone.
3. Overcome the infi ltration variability of the soil surface.
4. Optimize irrigation scheduling.

Presently, the subsurface drip irrigation (SDI) method is the only method capable of giving a manager this…

 

Download full copy of Research here

UPLAND COTTON VARIETAL RESPONSE TO SHORT-SEASON VERSUS LONG-SEASON MANAGEMENT PRACTICES

 

1998 was a year which brought many changes in the variety situation in the CA cotton industry. Many o f the management recommendations currently in place for CA Upland cotton are based upon years of research on varieties such as SJ-2, GC-510 and Maxxa. The introduction of some potentially widely-different varieties which were developed in environments outside of CA in most cases represents a real challenge in terms o f identifying the most suitable management practices for best results under SJV conditions. These “newly-available” varieties that will come into CA will have the name designation “CA Upland”…

Download full copy of Research here

ANNUAL MORNINGGLORY CONTROL WITH BXN COTTON

 

Ron Vargas, Fann Advisor, Madera County
Brian Marsh, Fann Advisor, Kern County
Tome Martin Duvall, SRA, Madera County
University of California Cooperative Extension
559-675-7879, Ex1. 212 rnvargas@ucdavis.edu

BXN (Buctril) transgenic tolerant cotton has been tested on a limited basis in University trials in 1997 and 1998 with extensive testing in 1999. In 1999, due to the changes in “One Quality Law” governed by the SJY Cotton Board, several thousand acres o f Stoneville BXN-47 cotton are now being commercially grown. Results of University trials, as well as grower experience, has indicated excellent control of most summer annual broad leaf weeds when…

 

Download full copy of Research here