Indian Society of Genetics & Plant Breeding
Resistant (R) strains of the egg parasitoid Trichogramma
chi/onis Ishii were developed against the three new
insecticides viz., indoxacarb, spinosad and tebufenozide
through 40 cycles of selection in the laboratory selection
pressures. The resistant factor observed was 8.7, 4.8 and
2.4 folds in resistant strain over susceptible strain of T.
chi/onis for indoxacarb, spinosad and tebufenozide,
respectively. Mode of inheritance of insecticides tolerance
studied using respective resistant 'R' and susceptible'S'
strains of T. chi/onis. The degree of dominance (D) of
indoxacarb tolerance was incomplete recessive for tolerant
females and semi dominant for tolerant males. For
spinosad, dominance levels were semi dominant for
resistant females and incomplete recessive for resistant
males. For tebufenozide, resistance was governed by semi
dominant gene for resistant females and incomplete
recessive gene for resistant males. The backcrossing of
F1 progeny with tolerant parent indicated that strong
resistance gene was coded by the coordination of genes
already present in indoxacarb male genotype, for both
spinosad and tebufenozide R female.
Keywords: Genetics of insecticide tolerance, indoxacarb, spinosad, tebufenozide resistance, Trichogramma chi/onis strain
Year: 2006
Volume: 66
Issue: 4
Article DOI: NA
Print ISSN: 0019-5200
Online ISSN: 0975-6906
P. S. Devi, S. K. Jalali and T. Venkatesan info_circle
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