An Evidence to Use Cotes/a plutellae (Kurdjumov) (Hymenoptera: Braconidae) as a Field Control Agent against Diamondback Moth,Plutella xylostella L (Lepidoptera: Plutellidae) |
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| Institution: | 1. Institute of Agriculture and Life Science, Gyeongsang National University, Jinju 52828, Republic of Korea;2. Department of Plant Medicine, Gyeongsang National University, Jinju, Republic of Korea;3. Laboratory of Insect Biosystematics, Division of Entomology, School of Agricultural Biotechnology, Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul 08826, Republic of Korea;4. Animal and Plant Quarantine Agency, 177, Hyeoksin 8-ro, Gimcheon-si, Gyeongsangbuk-do 39660, Republic of Korea;5. Department of Plant Medicine, College of Life Science and Natural Resources, Sunchon National University, 255 Jungang-ro, Suncheon-si, Jeonnam Province, 57922, Republic of Korea;1. Insect Biosystematics Laboratory, Research Institute of Agriculture and Life Science, Department of Agricultural Biotechnology, Seoul National University, 151-921, Republic of Korea;2. Naturhistorisches Museum, Augustinergasse 2, CH-4001 Basel, Switzerland;3. Department of Botany and Zoology, Faculty of Science, Masaryk University, Kotlá?ská 2, 611 37 Brno, Czech Republic;1. Insect Biosystematics Laboratory, Department of Agricultural Biotechnology, Seoul National University, Seoul 151-921, Republic of Korea;2. Research Institute for Agricultural and Life Sciences, Seoul National University, Seoul 151-921, Republic of Korea;3. Finnish Museum of Natural History, Zoological Museum, FIN-00014, University of Helsinki, Finland;1. Insect Biosystematics Laboratory, Research Institute of Agriculture and Life Science, Department of Agricultural Biotechnology, Seoul National University, 151-921, Korea;2. Naturhistorisches Museum, Augustinergasse 2, CH-4001 Basel, Switzerland;1. Insect Biosystematics Laboratory, Department of Agricultural Biotechnology, Seoul National University, Seoul 151-921, Republic of Korea;2. Research Institute for Agricultural and Life Sciences, Seoul National University, Seoul 151-921, Republic of Korea;3. Zoological Institute of the Russian Academy of Sciences, Universitetskaya emb. 1, St. Petersburg 199034, Russia;1. Animal and Plant Quarantine Agency, 177, Hyeoksin 8-ro, Gimcheon-si, Gyeongsangbuk-do 39660, Republic of Korea;2. Laboratory of Insect Biosystematics, Department of Agricultural Biotechnology, Research Institute of Agriculture and Life Sciences, Seoul National University, Seoul 08826, Republic of Korea;3. Department of Plant Medicine, Institute of Agriculture & Life Science, Gyeongsang National University, Jinju 52828, Republic of Korea |
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| Abstract: | The parasitic effectiveness of Cotesia plutellae Kurdjumov for the control of diamondback moth (DBM), Plutella xylostella L., was investigated without spraying pesticides in the greenhouse, and the damage degrees of Brassica rapa cv. Pakchoi grown in parasitoid-applied plot and control plot were evaluated. Among the 961 fourth instar DBM larvae collected in the common cabbage fields at Kwanshan region in Taiwan, 336 cocoons of C. plutellae were harvested from DBM larvae, which showed a parasitism rate of 35.0%. A total of 650 DBM adults and 600 C. plutellae adults were released according to the releasing scheme in the experiment plot. As a result, 56.7% of the DBM larvae were parasitized by C. plutellae adults 12 days before harvest, and the parasitism reached 80.8% at six days before harvest. At the harvest time, a population density of C. plutellae cocoons in the experiment plot was 2.2/plant, and that of normal DBM larvae was 0.5/plant. The density of DBM in the control plot was much higher than in the parasitoid-released plot by 7.7/plant. In the first survey, the density of DBM larvae on a Pakchoi plant was quite low, 0.3 ～ 0.8 larvae. However, the DBM population increased dramatically after six days later, 5.7-10.1 larvae/plant. The population density of DBM larvae showed clear difference between the parasitoid-released plot and control plot. The parasitism increased to nearly two fold within a week after the release of DBM adults. As a further study, a combining use of two or more species para-sitoids could be considered to improve a parasitism against DBM in the fields. |
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