Effects of Temperature on Development of Three Trissolcus spp. (Hymenoptera: Scelionidae), Egg Parasitoids of the Brown Marmorated Stink Bug, Halyomorpha halys (Hemiptera: Pentatomidae)(Physiology, Biochemistry, Development and Genetics)

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Laboratory experiments were carried out to study the effects of six constant temperatures, ranging from 15 to 27.5℃, on the rate of development and emergence of Trissolcus mitsukurii, T. plautiae and T. itoi using Halyomorpha halys eggs as hosts. At 15℃, both male and female progenies completed their development to adulthood, but a few females were able to emerge from the host eggs. Both sexes developed and successfully emerged from host eggs at 17.5℃ and above. Males of all parasitoids developed faster than females at each temperature. The value of the effective cumulative temperature shows that these three parasitoids may produce 11-15 generations annually. As H. halys produce 1-2 generations annually in Japan, the results indicated that these parasitoids do not depend solely on H. halys eggs for their hosts.
2002-06-25