How resistant is cotton to new races of fusarium wilt?

decrease font size  Resize text   increase font size       Printer-friendly version of this article Printer-friendly version of this article

During the past nine years, a new race of Fusarium wilt known as FOV Race 4 has caused increasing damage to cotton in California’s San Joaquin Valley. In a paper published online in Agronomy Journal on Sept. 6, researchers now report the results of field studies that measured the ability of elite cotton breeding lines to resist this new pathogen.

Once Fusarium is introduced into crop production areas, it expands widely and is nearly impossible to eradicate from soil as no chemicals can control it. Instead, one of the most effective and low-cost methods to manage the disease is to plant Fusarium-resistant cotton.

But little is known so far about the genetic resistance in U.S. upland cultivars and germplasm to Race 4 and other FOV races, or how these races interact with other cotton pathogens, such as Verticillium and reniform nematode. Moreover, the complete host range of the new FOV races is not well understood. With such limited knowledge about the ecological factors that favor these races, cotton production across the United States could be at risk.

To begin filling this knowledge gap, researchers from the USDA-ARS and the University of California were involved in 2008, 2010, and 2011 in FOV host-plant resistance trials. The team evaluated advanced breeding lines from the Regional Breeders Testing Network (RBTN, for disease resistance to FOV Race 1 and a second race, Race 4. Ten replicated field evaluations were conducted for each race on three different sites in the San Joaquin Valley.

During all three years, the elite breeding lines showed significant differences in their levels of resistance-response to FOV Races 1 and 4, as evidence by two measures of disease severity and overall plant survival. Studies of upland cotton lines also revealed interactions in FOV disease response between elite germplasm lines, FOV Races 1 and 4, and evaluation sites.

Elite lines selected from breeding programs in the states of Alabama, Arkansas, Louisiana, and Mississippi showed at least a moderate level of tolerance to both Fusarium races. Thus, the studies identified germplasm or genetic sources of FOV resistance that could be useful to breeders for improving cotton.

However, based on these evaluations, many of the entries in the current elite upland germplasm pools used by public plant breeders may be more susceptible than expected to some FOV races, and sources of acceptable levels of resistance may be limited when tested under infestation levels that resulted in only 5 to 35% plant survival in susceptible check cultivars. Continued development of cotton germplasm with wide adaptability, improved host-plant resistance, and enhanced fiber quality is essential for the long-term survival of the U.S. cotton industry.

Access the paper's abstract: Elite Upland Cotton Germplasm-Pool Assessment of Fusarium Wilt Resistance in California

Buyers Guide

Doyle Equipment Manufacturing Co.
Doyle Equipment Manufacturing prides themselves as being “The King of the Rotary’s” with their Direct Drive Rotary Blend Systems. With numerous setup possibilities and sizes, ranging from a  more...
A.J. Sackett Sons & Company
Sackett Blend Towers feature the H.I.M, High Intensity Mixer, the next generation of blending and coating technology which supports Precision Fertilizer Blending®. Its unique design allows  more...
R&R Manufacturing Inc.
The R&R Minuteman Blend System is the original proven performer. Fast, precise blending with a compact foot print. Significantly lower horsepower requirement. Low inload height with large  more...
Junge Control Inc.
Junge Control Inc. creates state-of-the-art product blending and measuring solutions that allow you to totally maximize operating efficiency with amazing accuracy and repeatability, superior  more...
Yargus Manufacturing
The flagship blending system for the Layco product line is the fully automated Layco DW System™. The advanced technology of the Layco DW (Declining Weight) system results in a blending  more...
Yargus Manufacturing
The LAYCOTE™ Automated Coating System provides a new level of coating accuracy for a stand-alone coating system or for coating (impregnating) in an automated blending system. The unique  more...
John Deere
The DN345 Drawn Dry Spreader can carry more than 12 tons of fertilizer and 17.5 tons of lime. Designed to operate at field speeds up to 20 MPH with full loads and the G4 spreader uniformly  more...
Force Unlimited
The Pro-Force is a multi-purpose spreader with a wider apron and steeper sides. Our Pro-Force has the most aggressive 30” spinner on the market, and is capable of spreading higher rates of  more...
BBI Spreaders
MagnaSpread 2 & MagnaSpread 3 — With BBI’s patented multi-bin technology, these spreaders operate multiple hoppers guided by independent, variable-rate technology. These models are built on  more...

Comments (0) Leave a comment 

e-Mail (required)


characters left

1325 Bushel Grain Cart

Equipped with a 22” computer balanced auger with 5/16” flighting,the unloading speed is 50% faster than smaller grain carts with ... Read More

View all Products in this segment

View All Buyers Guides

Feedback Form
Feedback Form