Susceptibility of Field Populations of Beet Armyworm (Lepidoptera: Noctuidae) to Cyfluthrin, Methomyl, and Profenofos, and Selection for Resistance to Cyfluthrin

1996 ◽  
Vol 89 (6) ◽  
pp. 1359-1363 ◽  
Author(s):  
S. A. Aldosari ◽  
T. F. Watson ◽  
S. Sivasupramaniam ◽  
A. A. Osman
Keyword(s):  
Beet Armyworm ◽  
Selection For ◽  
Lepidoptera Noctuidae

Fungus-Induced Biochemical Changes in Peanut Plants and Their Effect on Development of Beet Armyworm,Spodoptera ExiguaHübner (Lepidoptera: Noctuidae) Larvae

2003 ◽  
Vol 32 (1) ◽  
pp. 220-228 ◽  
Author(s):  
Yasmin J. Cardoza ◽  
Cameron G. Lait ◽  
Eric A. Schmelz ◽  
Juan Huang ◽  
James H. Tumlinson
Keyword(s):  
Biochemical Changes ◽  
Beet Armyworm ◽  
Lepidoptera Noctuidae

Susceptibility of Field Populations of Beet Armyworm (Lepidoptera: Noctuidae) to Commercial and Experimental Insecticides

1998 ◽  
Vol 91 (4) ◽  
pp. 827-833 ◽  
Author(s):  
V. J. Mascarenhas ◽  
J. B. Graves ◽  
B. R. Leonard ◽  
E. Burris
Keyword(s):  
Beet Armyworm ◽  
Lepidoptera Noctuidae

Positive association between resistance to Bacillus thuringiensis and overwintering survival of cabbage loopers, Trichoplusia ni (Lepidoptera: Noctuidae)

2008 ◽  
Vol 98 (3) ◽  
pp. 317-322 ◽  
Author(s):  
V. Caron ◽  
J.H. Myers
Keyword(s):  
Bacillus Thuringiensis ◽  
Trichoplusia Ni ◽  
Positive Association ◽  
Pest Species ◽  
Development Of Resistance ◽  
Trade Offs ◽  
Major Pest ◽  
Selection For ◽  
Overwintering Survival ◽  
Lepidoptera Noctuidae

AbstractDevelopment of resistance to insecticides has generally been associated with fitness costs that may be magnified under challenging conditions. Lepidopterans which are resistant to the biopesticide Bacillus thuringiensis subsp. kurstaki (Btk) have been shown to have reduced fitness, such as lower survival when subjected to overwintering stress. Recently, resistance to Btk has been found in some populations of Trichoplusia ni Hübner in greenhouses in British Columbia. This situation provides an opportunity to investigate potential trade-offs between overwintering survival and insecticide resistance in a major pest species. Here, we assess the survival and eventual fecundity of Btk resistant and susceptible T. ni pupae exposed to cool temperatures. Contrary to our expectations, resistant T. ni had higher overwintering survival than susceptible individuals. This is the first account of a potential advantage associated with Btk resistance. Resistant and susceptible moths had reduced fecundity and smaller progeny after cold exposure compared to controls, and this may counteract the survival advantage. Nevertheless, it seems unlikely that this is sufficient to select out the resistant phenotype in the presence of strong selection for resistance and in the absence of immigration of susceptible moths. The appearance of resistance without evidence of a trade-off in overwintering survival presents a major challenge to management in production greenhouses.

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