Quality Attributes of Sugarcane Adapted Internode Borer Strain of Trichogramma chilonis Ishii (Trichogrammatidae: Hymenoptera) in Successive Generations
Keywords:
Trichogramma chilonis, internode borer, generation, egg parasitoid, strain, sugarcane.Abstract
Quality attributes of Trichogramma chilonis Ishii (Trichogrammatidae: Hymenoptera) (internode borer strain) was studied for F1 to F10 generations. The low fecundity rate (38.1-42.5) in the F1 to F5 generations and a better performance in advanced generations can be related to the establishment process and maintenance of colonies of Trichogramma chilonis in the laboratory. The adult emergence was significantly higher in F3-F4 , F6-F9 (100.8-115.2%) than F1-F2 and F5(73.1-89.0%). In generations F3, F6, F7, F8, F9 Corcyra eggs were super parasitised because more than 100 percentages of adults emerged and these eggs yielded less female ratio. The female ratios of T. chilonis were higher than 50 per cent in all generations except F generation, which demonstrates that the reproductive potential of 8 T. chilonis was not affected by number of generations in the laboratory. It also shows that T.chilonis present good adaptable to laboratory host, Corcyra cephalonica eggs in the laboratory. It is concluded that INB-reared strain of T.chilonis seems to be a more promising candidate for biological control of sugarcane borers due to its high fecundity rate and female biased sex ratios.
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