As larvae grow, they take on a more dull yellow to olive coloration. Pupae Pupae are bright orange-yellow when newly formed. While the life history of elm leaf beetles in Kansas has not been documented, there are most certainly two generations per year, with a partial third likely to occur in years with early breaking springs followed by favorable and extended summer conditions. The timing of events may vary, depending upon one s location in Kansas. During the fall, adult elm leaf beetles seek the protection of sheltered sites for the purpose of surviving the rigors of winter.
Many beetles seek indoor refuges including homes, garages, sheds and outbuildings.
When leaves begin to develop and unfurl in the spring, over wintered elm leaf beetles seek out the new foliage on which they begin foraging and mating activities. Eggs are deposited, and a week to 10 days later, first-generation larvae emerge and begin feeding in groups on lower leaf surfaces. This text was extracted from the publication, MF2392.