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http://dx.doi.org/10.5656/KSAE.2015.03.0.007

Construction and Evaluation of Cohort Based Model for Predicting Population Dynamics of Riptortus pedestris (Fabricicus) (Hemiptera: Alydidae) Using DYMEX  

Park, Chang-Gyu (Crop protection Division, Department of Crop Life Safety, National Academy of Agricultural Science)
Yum, Ki-Hong (R&D Trialing team, Syngenta Korea Ltd.)
Lee, Sang-Ku (Crop protection Division, Department of Crop Life Safety, National Academy of Agricultural Science)
Lee, Sang-Guei (Crop protection Division, Department of Crop Life Safety, National Academy of Agricultural Science)
Publication Information
Korean journal of applied entomology / v.54, no.2, 2015 , pp. 73-81 More about this Journal
Abstract
A Cohort based model for temperature-dependent population dynacmics of Riptortus pedestris was constructed by using a commercial software (DYMEX) and seasonal occurrence along with pesticide treatments effect was simulated and validated with pheromone trap data. Ten modules of DYMEX software were used to construct the model and Lifecycle module was consisted of seven developmental stages (egg, 1 - 5 nymphal instars, and adult) of R. pedestirs. Simulated peaks of adult populations occurred three or four times after the peak of overwintered populations which was similar to those observed from pheromone trap catch. Estimated dates for the second peak were quite similar (1-2 day difference) with those observed with pheromone trap. However, the estimated dates for the first population peak were 9-16 days later than the observed dates by pheromone trap and the estimated dates for the last peak were 17-23 days earlier than the observed dates. When insecticide treatments were included in the simulation, the biggest decrease in R. pedestris adult density occurred when insecticide was applied on July 1 for the first peak population: the estimated adult density of the second peak was 3% of untreated population density. When insecticide was assumed to be applied on August 30 for the second peak population, the estimated adult density of the following generation was about 25% of untreated population and the peak density of the following generation reached about two weeks later than untreated population. These results can be used for the efficient management strategies for the populations of R. pedestris.
Keywords
Riptortus pedestris; DYMEX; Population dynamics model; Simulation;
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