Kudzu bugs have two generations per season on soybeans. Adults move from kudzu to early-planted soybeans in the spring, deposit egg masses and eventually die. The immatures then hatch and eventually become adults after about six weeks and begin to deposit eggs for the next generation.

A limited number of kudzu bugs may appear in beans season-long. The most efficient and economic use of insecticides occurs when an application is made when the majority of the population in each generation is in the immature stage.

Some fields have already exceeded treatment threshold and will likely require two or more sprays during the 2013 season. Fields with lower populations may be able to wait until mid-July or later for a treatment. Only one application may be needed in these fields during the 2013 season. 

Applications made when a high number of unhatched egg masses are present may have to be repeated within one to two weeks. Our goal should be to strategically time these insecticide applications for maximum effectiveness.

Treating soybeans repeatedly at close intervals has not resulted in yield increases over fewer well-timed applications. The key point is for growers and field men to focus on the peaks of immature kudzu bugs as we move through the 2013 season.

There will be no way to economically prevent yield losses to kudzu bugs and minimize inputs without monitoring or scouting soybeans weekly just as we have done in other row crops for decades.

Kudzu bugs are not the end of the world for soybean production in Alabama, but they do create a new day.

Pictures of adult and immatures are available on Ron Smith’s blog http://alabama-insects.blogspot.com/. Basic Kudzu bug information can be found at http://www.clemson.edu/extension/Kudzubugs/index.html. Updates on the Kudzu bug status will be posted on the www.alabamacrops.com website. The Extension Soybean IPM guide has recommendations for Kudzu bugs on page six http://www.aces.edu/pubs/docs/I/IPM-0413/IPM-0413.pdf.

 

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