タイトル無し

概要

論文の詳細を見る
Functional response of Encarsia forniosa GAHAN was examined at 25°C. First, second, third and fourth instar larvae of the greenhouse whitefly Trialeurodes vaporariorum (WESTWOOD) were prepared. The larvae at each instar were divided into seven groups of densities; 1, 2, 4, 9, 16, 25 and 36 individuals per Petri dish, 6 cm in diameter. Each group was exposed for 3 hours to a female of E. Formosa which was 2-4 days old and had not experienced oviposition. The number of hosts parasitized and killed by host-feeding was calculated. The functional response curve in each instar host showed a saturated type. The theoretical maximum number of hosts parasitized was between 10 and 14 individuals and did not vary with the host larval instars. The theoretical maximum number of hosts killed by host-feeding was 10 in the first instar hosts and the value decreased in the older hosts. It was suggested that in the younger hosts the mortality by host-feeding was higher than that by parasitization. On the other hand in the older hosts the opposite relation would be observed.
九州病害虫研究会の論文