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  • Southern IPM blog posts

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  • Funded by USDA National Institute of Food and Agriculture

    The Southern Region IPM Center is located at North Carolina State University, 1730 Varsity Drive, Suite 110, Raleigh, NC 27606, and is sponsored by the United States Department of Agriculture, National Institute of Food and Agriculture.
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UGA plant pathologist cautions Georgia grape growers against fungicide resistance to downy mildew

By Clint Thompson, University of Georgia

Fungicide resistance to downy mildew disease is a growing concern for Georgia grape producers. University of Georgia Extension Fruit Disease Specialist Phil Brannen advises growers to modify their fungicide applications to combat the increasing resistance.

“If producers properly rotate the chemical ingredients (used in the different fungicides) that treat for downy mildew, this will help our chemical classes be sustainable for years to come,” Brannen said. “We have already essentially lost one of our fungicides — the quinone outside inhibitors (Qol) — and we simply can’t afford to lose more classes if we are to manage this aggressive disease in the future.” Continue reading

Cotton growers should be patient in treating for target spot

In Delta Farm Press

Conditions in west Tennessee are setting up as conducive for target spot infestations in cotton. Or maybe not.

Heather Kelly, Extension pathologist at the University of Tennessee Research and Extension Center in Jackson, says several factors need to coincide for target spot to pose a threat to cotton. Continue reading

Bacterial blight on resistant cotton varieties

See Southwest Farm Press for photos and data tables

The moderate temperatures and wet conditions experienced throughout the High Plains from May to July were conducive for the development of bacterial blight (Fig. 1). An increase in the disease was observed across most of the region with observations of bacterial blight-like symptoms occurring on varieties that had previously been documented as being resistant or immune.

Initial ratings of a research trial near Plains, Texas, found the disease to be present in most all plots with disease incidence averaging nearly 25 percent. Upon closer examination, the ratings were found to be incorrect resulting from erroneous labeling of plots in the field. This is good news from a production perspective, as the updated disease ratings with correctly labeled plots immune.

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IPM grants help peach and strawberry growers thwart resistant crop diseases

In 2006 an Extension plant pathologist from Clemson won a $115,000 Regional IPM grant from USDA National Institute of Food and Agriculture (then CSREES) to develop a kit that would help peach growers in Georgia and South Carolina choose an effective fungicide to fight resistant brown rot disease. That initial investment spurred at least three additional grants that refined the kit and has since benefited both the peach and strawberry industries at an estimate of $12 million.

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Know your FRAC codes

Don’t know what a FRAC code is? It’s important when dealing with fungicide resistance. In this blog post at UT Crops, authors Alice Cochran (Graduate Research Asst.) and Heather Kelly (Extension Plant Pathologist) discuss what FRAC codes are and why it’s important when you’re rotating fungicides. FRAC stands for the Fungicide Resistance Action Committee, and although the authors focus on Tennessee, the recommendations apply to anyone in any state in the U.S. Continue reading

Soybean diseases showing fungicide resistance

From Delta Farm Press

Nature always finds a way and that’s why the Mid-South is facing not only herbicide resistance in weeds but also an upswing of fungicide resistance in some soybean diseases.

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