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Biological control potentials of insect-parasitic nematode Rhabditis blumi (Nematoda: Rhabditida) for major cruciferous vegetable insect pests

Biological control potentials of insect-parasitic nematode Rhabditis blumi (Nematoda: Rhabditida)... 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 (0–80 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. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Applied Entomology and Zoology Springer Journals

Biological control potentials of insect-parasitic nematode Rhabditis blumi (Nematoda: Rhabditida) for major cruciferous vegetable insect pests

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References (29)

Publisher
Springer Journals
Copyright
Copyright © 2012 by The Japanese Society of Applied Entomology and Zoology
Subject
Life Sciences; Environmental Management; Plant Pathology; Zoology; Entomology; Applied Ecology; Agriculture
ISSN
0003-6862
eISSN
1347-605X
DOI
10.1007/s13355-012-0131-9
Publisher site
See Article on Publisher Site

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 (0–80 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.

Journal

Applied Entomology and ZoologySpringer Journals

Published: Sep 9, 2012

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