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Bean leaf beetle numbers 'extremely large' in Ohio

Agriculture.com Staff 09/06/2006 @ 12:22pm

Bean leaf beetles are showing up in "extremely large" numbers in Ohio soybean fields, according to two Ohio State University Extension entomologists.

"Just last week, we received reports of extremely large bean leaf beetle populations on later planted soybeans in northern Ohio that averaged 10 to 20 adult beetles per sweep," wrote OSU Extension entomologists Ron Hammond and Bruce Eisley this week.

The high numbers were found on beans in the late R5 stage of development, meaning pod-fill is still underway in pods higher up in the plant. Coming this late in the season, the OSU entomologists say defoliation is no longer a great concern, but growers should remain wary of damage to the pods themselves.

"Injury to the pod is a concern because of both potential yield and quality loss," Hammond and Eisley wrote. "This concern is especially important with food-grade soybeans and those being grown for seed, both situations where seed quality is an issue."

Growers should exercise caution when implementing control measures, even in the presence of high populations, especially considering the shortened time interval between now and fall harvest.

"Growers are strongly advised to continue monitoring those soybean fields that are still green and will remain so for a few weeks for the presence of bean leaf beetles," the OSU entomologists wrote. "However, fields that still filling pods are at also risk for yield losses. If populations are high, beetles are still active and continuing to feed, and pod injury has reached 10% and is relatively new feeding, treatment is warranted to prevent further pod damage.

"Growers should be careful with their insecticide choice because of the shorter time period from application to harvest."

Bean leaf beetles are showing up in "extremely large" numbers in Ohio soybean fields, according to two Ohio State University Extension entomologists.

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