ISSN:
1570-7458
Keywords:
diamondback moth
;
Lepidoptera
;
Plutellidae
;
Steinernema
;
Heterorhabditis
;
relative humidity
;
biological control
Source:
Springer Online Journal Archives 1860-2000
Topics:
Biology
Notes:
Abstract We investigated the ability of entomopathogenic nematodes to infect diamondback moth (DBM),Plutella xylostella (L.) (Lepidoptera: Plutellidae) on a leaf surface. In a leaf disk assay, mortality of late stage DBM larvae ranged from 〈7% caused bySteinernema kushidai Mamiya to 〉95% caused byS. carpocapsae (Weiser) All strain. LC50 values forS. carpocapsae, S. riobravis Cabanillas, Poinar & Raulston, andHeterorhabditis bacteriophora Poinar NC1 strain were 14.6, 15.4, and 65.4 nematodes/larva, respectively.S. carpocapsae, S. riobravis, andH. bacteriophora caused 29%, 33%, and 14% mortality of DBM pupae, respectively. DBM mortality caused byS. carpocapsae on radish declined at low (〈76%) to moderate (76–90%) RH, because nematode survival and infectivity declined at low (〈76%) to moderate (76–90%) RH. However, DBM mortality caused byS. riobravis did not decline with RH.S. riobravis survival declined with RH, but infectivity did not. Overall, nematode survival and infectivity to DBM larvae were lower forS. riobravis than forS. carpocapsae. In addition, DBM mortality was higher on radish plants (pubescent leaves) than on cabbage plants (glaborous leaves).
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF02383058
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