Armyworm Update Week of August 8 - Numbers are high!
It is time to pay attention to armyworms again. The number of moths caught in the pheromone traps has gone up significantly in several locations. Moths are flying, mating, and laying eggs. Using the degree day model, we can predict the presence of small larvae by August 15, and large larvae by August 20. Larvae will feed on the panicle and cause broken branches with blank kernels. Larvae will also cause some defoliaiton, but at this stage of rice development panicle feeding is more important. If 10% of panicles are injured, and larvae can be found in the field, a treatment is recommended.
For pictures of armyworm panicle injury, go here: http://ucanr.edu/blogs/blogcore/postdetail.cfm?postnum=7990
Download graphs: Week August 8
Map to trap locations: Armyworm traps 2018
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