Resistant cabbage cultivars change the susceptibility of Plutella xylostella to Bacillus thuringiensis

Summary 1 Laboratory studies demonstrated that the susceptibility of larvae of the lepidopteran crucifer pest Plutella xylostella to the insect pathogen Bacillus thuringiensis (Bt) was influenced by the host plant. 2 Larvae reared on the resistant cabbage cultivars Minicole F1 and Red Drumhead were...

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Bibliographic Details
Published in:Agricultural and forest entomology 2000-02, Vol.2 (1), p.33-38
Main Authors: Schuler, T.H, Emden, H.F. van
Format: Article
Language:English
Subjects:
Bacillus thuringiensis
bacterial insecticides
biological control
biological control agents
biological development
biological resistance
brassica chinensis var. pekinensis
Brassica oleracea var. capitata
Brassica oleracea var. sabauda
Brassica rapa subsp. chinensis
Brassica spp
cultivars
food intake
food plants
mortality
plant resistance
Plutella xylostella
Plutellidae
stress
varietal resistance
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Summary:Summary 1 Laboratory studies demonstrated that the susceptibility of larvae of the lepidopteran crucifer pest Plutella xylostella to the insect pathogen Bacillus thuringiensis (Bt) was influenced by the host plant. 2 Larvae reared on the resistant cabbage cultivars Minicole F1 and Red Drumhead were significantly more susceptible to Bt (the LC50 fell to one half) than larvae fed leaves of susceptible cultivars. 3 However, a third resistant cultivar, Aquarius F1, had no synergistic effect on Bt‐related mortality. 4 Actual uptake of Bt was monitored in the bioassays, as a preliminary experiment showed that the plant resistance reduced consumption of Bt‐treated leaf discs. However, differences in feeding rate did not explain the observed differences in mortality.
ISSN:1461-9555
1461-9563
DOI:10.1046/j.1461-9563.2000.00042.x