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Fitness of twospotted spider mites is more affected by constitutive than induced resistance traits in cotton ( Gossypium spp.)
Author(s) -
Miyazaki Junji,
Wilson Lewis J,
Stiller Warwick N
Publication year - 2013
Publication title -
pest management science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.296
H-Index - 125
eISSN - 1526-4998
pISSN - 1526-498X
DOI - 10.1002/ps.3546
Subject(s) - fecundity , biology , tetranychus urticae , spider mite , mite , gossypium , population , resistance (ecology) , acariformes , zoology , botany , toxicology , ecology , demography , sociology
BACKGROUND Life history parameters are useful tools for comparing the fitness of pests on different host plants. This study compared life history parameters of twospotted spider mites ( Tetranychus urticae Koch) on two resistant cotton Gossypium genotypes ( BM13H and Sipima 280) and one susceptible genotype (Sicot 71). The effects of both constitutive and induced defences were assessed . RESULTS Mites reared on the resistant genotypes had longer immature development times, lower immature survival and reduced adult fecundity. Mites reared on BM13H that had been induced by prior exposure to mites had a small additional decrease in adult fecundity. The contribution to mite resistance of constitutive resistance mechanisms was much greater than induced responses. The effect of morphological constitutive defences was minor, implicating biochemical defences as the major mite‐resistance mechanism. Sensitivity analysis and a population development study using life history parameters of mites showed that a lower immature survival rate on resistant genotypes had the greatest effect on mite fitness and population development . CONCLUSION Use of life history parameters provided valuable insight into the mite‐resistance mechanisms of these Gossypium genotypes. Further, the results largely explained mite population development on these genotypes in the field. © 2013 Society of Chemical Industry