On the Parasitic Activity and the Age in Days of Adult Paracentrobia andoi (ISHII) (Hymenoptera : Trichogrammatidae), an Egg Parasite of the Green Rice Leafhopper, Nephotettix cincticeps UHLER(Homoptera : Deltocephalidae) : (Studies on Natural Enemies of Leafhoppers 4.)

Paracentrobia andoi (ISHII) is one of the dominant egg parasites of Nephotettix cincticeps UHLER in Japan. Under a laboratory condition, when honey was given as diet, P. andoi deposited eggs on the average 27.9, 14.5, 12.1, 12.1 and 0.9 host eggs on the 1st, 4th, 8th, 12th and 16th day after emergence, respectively. When the diet was water alone, however, parasitized eggs lowered, and the average numbers were 22.8, 22.9, 10.7, 0.9 and 0.7 on the respective days. The highest egg depositing period ranged from 2 to 3 days after emergence and a large part of eggs was deposited on the first day of oviposition. The duration of adult life of P. andoi was prolonged by giving honey. From the results obtained in the present experiment, it could be considered that P, andoi is a pro-ovigenic parasrte.