Beet Armyworm (Lepidoptera: Noctuidae) Adult and Larval Susceptibility to Three Insecticides in Managed Habitats and Relationship to Laboratory Selection for Resistance

1990 ◽  
Vol 83 (6) ◽  
pp. 2136-2146 ◽  
Author(s):  
Michael J. Brewer ◽  
John T. Trumble ◽  
Benito Alvarado-Rodriguez ◽  
William E. Chaney
Keyword(s):  
Beet Armyworm ◽  
Laboratory Selection ◽  
Selection For ◽  
Lepidoptera Noctuidae ◽  
Larval Susceptibility

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

Using laboratory selection for desiccation resistance to examine the relationship between respiratory pattern and water loss in insects.

1998 ◽  
Vol 201 (21) ◽  
pp. 2945-2952 ◽  
Author(s):  
A E Williams ◽  
M R Rose ◽  
T J Bradley
Keyword(s):  
Drosophila Melanogaster ◽  
Water Loss ◽  
Loss Rate ◽  
Respiratory Pattern ◽  
Desiccation Resistance ◽  
Water Loss Rate ◽  
Laboratory Selection ◽  
Selection For ◽  
The Relationship ◽  
Co2 Release

We conducted concurrent measurements of rates of CO2 and H2O release from individual fruit flies Drosophila melanogaster taken from populations subjected to three different selective regimes: (1) populations selected for resistance to desiccation (D flies); (2) populations maintained as their controls (C flies); and (3) the ancestral populations of the D and C populations (O flies). In the D flies, water loss rates were significantly reduced, the standard error of the regression (SER) of the CO2 release pattern measured over the survival period of the flies was increased, and the ratio of CO2 loss to H2O loss (VCO2/VH2O) was increased. Correlations across all 15 populations from the three selection treatments indicate that survival time was negatively correlated with water loss rate, positively correlated with the SER of CO2 release and positively correlated with the VCO2/VH2O ratio. We did not, however, find a significant correlation between the SER of CO2 release and rates of water loss or the VCO2/VH2O ratio.

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.

Sign in / Sign up

Export Citation Format

Share Document