Reproduction characteristics of trichogramma brasiliensis and t. lutea, parasitising eggs of heliothis armiger
1982
KFIR, RAMI
The search rate, the number of ♀ progeny per ♀ parent and the sex ratio of the progeny of Trichogrammatoidea lutea Girault were severely affected by increasing the parasite density from 1/150 hosts to 8/150. Trichogramma brasiliensis Ashmead was very little affected. Females of T. lutea were more susceptible than ♀ ♀ of T. brasiliensis to interference from other searching ♀ ♀ or by encountering hosts that had been previously parasitised. T. lutea ♀ ♀ tended to leave the area they searched following interference. T. lutea was found to be arrhenotokous and T. brasiliensis deuterotokous. T. lutea clustered its progeny in the hosts more than T. brasiliensis. The average number of T. lutea progeny that developed in a host was 2.02 as compared with 1.28 for T. brasiliensis. The clustering of ♀ progeny in the parasitised hosts by the 2 species did not differ. The average number of T. lutea ♀ ♀ per host was 1.32. When more than one progeny of a mated T. lutea ♀ developed in a host, usually only one ♀ emerged, the rest being ♀ ♀. T. lutea produced more ♀ progeny per ♀ parent than T. brasiliensis and its developmental time was shorter.
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