Biological control potentials of insect-parasitic nematode Rhabditis blumi (Nematoda: Rhabditida) for major cruciferous vegetable insect pests |
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Authors: | Hae Woong Park Hyeong Hwan Kim Sung Hun Youn Taek Su Shin Anwar L Bilgrami Myoung Rae Cho Chul Soo Shin |
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Institution: | 1. Department of Biotechnology, College of Life Science and Biotechnology, Yonsei University, Seoul, South Korea 2. Horticultural and Herbal Crop Environment Division, National Institute of Horticultural and Herbal Science, Suwon, South Korea 3. Department of Mosquito Control, Cape May Court House, NJ, 08210, USA 4. Chair of Advanced Proteomics and Cytomics Research, Department of Zoology, College of Science, King Saud University, P.O. Box 2455, Riyadh, 11451, Saudi Arabia
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Abstract: | Pathogenicity of Rhabditis blumi Sudhaus against major cruciferous insect pests was evaluated in the lab and greenhouse. In Petri-dish tests against the insects, including Artogeia rapae L., Mamestra brassicae L., and Plutella xylostella L., insect mortality by R. blumi and its associated bacteria was dose and time dependent, which increased with dose (0?C80 dauer juveniles/larva) and time increments. Pathogenicity against fourth-instar larvae was higher than the rate of corresponding third-instar larvae. The highest insect mortality rate was observed in fourth-instar larvae of P. xylostella, followed by A. rapae, and M. brassicae, with mortality rates of 93.5, 88.2, and 77.8?%, respectively. Lethal dose values at 50?% (LD50) of R. blumi were 25.7 dauer juveniles/larva on P. xylostella; 28.0 dauer juveniles/larva on A. rapae; and 40.6 dauer juveniles/larva on M. brassicae, respectively. In greenhouse tests, P. xylostella larvae were most susceptible to nematodes, with insect reduction rate of 88.0?%. The rate varied with vegetable species and persistence time of live nematodes on vegetable leaves after spraying. Nematodes established in cadavers showed positive correlation with nematode dose, whereas nematode persistence on the leaf was inversely related to hours after treatment. |
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