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Asian Journal of Agriculture and Development (AJAD) - Call for papers!

The Potency of Egg Parasitoid Trichogrammatoieda bactrae bactrae Nagaraja Against Soybean Pod Borer Etiella spp

(Indonesia), Master of Science in Entomology (Gadjah Mada University)

Abstract:

 

The potency of egg parasitoid Trichogrammatoieda bactrae bactrae parasitizing soybean pod borer was conducted in the field and laboratory from August 1997 to June 1998. The field experiment was carried out in the Agricultural, Research, Education and Development Garden, Faculty of Agriculture, Jember University, Jubung, and in a farmer’s field in Sukorejo, Jember, East Java. The objectives of the study were to (1) investigate the proper release-time of the parasitoid in relation to soybean plant phenology, (2) investigate the impact of released T. bactrae bactrae, and (3) describe numerical response of T. bactrae bactrae against the egg of Etiella spp. Laboratory experiment, which was carried out at the Entomological Laboratory, Department of Pest and Plant Diseases, Faculty of Agriculture, Jember University, aimed to investigate the host range of T. bactrae bactrae.

The results of the field experiment indicated that egg population of Etiella spp. was the same in all plot experiments. Parasitization level of T. bactrae bactrae against pod borer’s egg was higher at the plot where parasitoid was released at R3 generative stage of soybean than at R1 or R5. Soybean pod damage was lower at R3 stage. Numerical response of T. bactrae bactrae against pod borer’s egg by release of T. bactrae bactrae on soybean field was positive and strong.

The results of the laboratory experiment indicated that parasitization level of T. bactrae bactrae against Etiella spp., Chrysodeixis chalcites, Helicoperva armigera, and Nezara viridula was not different. The number of parasitoid adult was higher on Etiella spp., and development stages of T. bactrae bactrae were different, where the average of parasitization on egg of Etiella spp. was 7.60 days, on C. chalcites was 7.51 days, and on H. armigera was 7.41 days.