Premium
Resistant cabbage cultivars change the susceptibility of Plutella xylostella to Bacillus thuringiensis
Author(s) -
Schuler Tanja H.,
Van Emden H. F.
Publication year - 2000
Publication title -
agricultural and forest entomology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.755
H-Index - 55
eISSN - 1461-9563
pISSN - 1461-9555
DOI - 10.1046/j.1461-9563.2000.00042.x
Subject(s) - plutella , biology , bacillus thuringiensis , cultivar , larva , crucifer , pest analysis , bioassay , cabbage looper , biological pest control , insect , host (biology) , plutellidae , horticulture , agronomy , botany , trichoplusia , diamondback moth , ecology , bacteria , noctuidae , genetics
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 F 1 and Red Drumhead were significantly more susceptible to Bt (the LC 50 fell to one half) than larvae fed leaves of susceptible cultivars. 3 However, a third resistant cultivar, Aquarius F 1 , 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.