This temporal difference coincided with the estimated duration of the egg stage plus an assumed mating period. The raw catch numbers of the two trap types in August and September 20 preceded subsequent damage peaks by an average of 5.3 days. To determine the relationship between pest arrival and crop damage, trap catch numbers and the number of soybean leaves damaged by 1st-instar larvae were examined by separately comparing raw numbers and cumulative numbers. litura in a soybean field in southwestern Japan was preliminarily investigated using a searchlight trap in comparison to a pheromone trap at one location, from August to mid-October in 2016–2018. To understand the occurrence of soybean leaf damage, the dispersal of S.

Thus, there is no accurate means of forecasting soybean damage, and insecticide is applied on the basis of farmers’ observations of actual damage in fields. Pheromone traps are used to monitor male adults, but the catch peaks do not always predict leaf damage in soybean fields. The common cutworm, Spodoptera litura Fabricius (Lepidoptera: Noctuidae) is a major pest of soybean.

Download types of cutworms