Seasonal Prevalence of Adult Emergence and Prediction of Date of First Emergence of Podocarpus Longicorn, Hirticlytus comosus (Matsushita) (Coleoptera: Cerambycidae), in Chiba Prefecture

Abstract

The podocarpus longicorn, Hirticlytus comosus (Matsushita), is a pest of bigleaf podocarp, Podocarpus macrophyllus (Thunb.) D. Don, mainly in the Kyushu region of Japan. It was recorded in Chiba prefecture for the first time in 2008. Because one of the main control methods is pesticide spraying during adult emergence, we investigated the date of first emergence and the emergence pattern of adults. The cumulative temperature for first emergence was estimated to be 40.9 degree-days above 14.6°C from February 16. The rate of emergence increased with a rise of maximum air temperature above 20°C during the emergence period.