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• W2184722317 abstract "he biology, behaviour and mass multiplication of two species of indigenous Tparasitoids of the teak defoliator, Hyblaea puera Cramer (Lepidoptera : Hyblaeidae) namely, Sympiesis hyblaeae Surekha (Hymenoptera : Eulophidae) and Palexorista solennis (Walker) (Diptera : Tachinidae) were studied and the usefulness of these parasitoids as candidates for the biological control programme was evaluated based on their biological characteristics. The acceptance of H. puera eggs by two species of exotic egg parasitoids namely Trichogramma dendrolimi Matsumara and T. embryophagum (Hartig) was also investigated. S. hyblaeae preferred to lay eggs onfirst or second instar host larvae. The larvae selected for oviposition was paralysed and a single egg was deposited on the lateral side of the body in the intersegmental region. A single parasitoid laid an average of 15 eggs during its lifespan. Continuous multiplication of the larvae in the laboratory was not possible as the parasitoid entered diapause in the pupal stage during the months February-May. As the diapause period coincides with the early phase of pest buildup, the parasitoid population is not able to numerically respond to the increasing pest population. The scope for mass multiplying the parasitoid for release in the field during the critical period of pest incidence thus appears to be limited. It is concluded that S. hyblaeae is not a suitable candidate for use in the biological control programme against the teak defoliator. P. solennis is an endoparasite and infested third and fourth instar larvae of H. puera. The female laid an average of 43 eggs during its lifespan. Host larva was not paralysed prior to oviposition. Normally a single parasitoid larva developed within a n host. Laboratory studies established the feasibility of continuous rearing of the parasitoid on host larvae. An agar based artificial diet was developed and method of rearing P. solennis tested. The feasibility of mass multiplication suggests that this species can be produced in large numbers. However, further refinement of the methods of multiplication is needed before using this species for practical biological control. Under laboratory conditions the egg parasitoids. T. dendrolimi and T. embryophagum parasitised H. puera eggs. In terms of percentage parasitism T. embryophagum was found superior to T. dendrolimi Both the species preferred to parasitise fresh eggs and percentage parasitism on one-day old eggs was significantly lower than that on fresh eggs. This indicated that successful parasitism by these parasitoids is dependent on the availability of fresh eggs for their oviposition. It is concluded that the success of using these egg parasitoids in the practical biological control programme depends on our ability to predict the pest incidence and timing of their inundative release in thefield." @default.
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• W2184722317 date "1997-01-01" @default.
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• W2184722317 title "EVALUATION OF PARASITOIDES FOR BIOLOGICAL CONTROL OF THE TEAK DEFOLIATOR" @default.
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