Comparison of the efficacy of chemical control and Helicoverpa NPV for the management of Helicoverpa armigera (Hubner) on resistant and susceptible chickpea
1996
Cowgill, S.E. | Bhagwat, V.R.
The influence of host-plant resistance on the efficacy of NPV and quinalphos as mortality factors in Helicoverpa armigera Hubner populations on chickpea was examined in the field in 1993 and 1994. The effects of chickpea genotype and NPV or quinalphos were not independent. In 1994 quinalphos had a greater effect on the density of large H. armigera larvae on susceptible genotypes than on the resistant genotype (ICC 506). In 1993, NPV had greater effect on the density of large larvae on susceptible genotypes than on ICC 506. In 1993, the yields of NPV-treated susceptible genotypes were significantly greater than those in the quinalphos treatment or control. In 1994, the yields of susceptible genotypes treated with NPV or quinalphos were similar and significantly greater than those in the control. Yields of ICC 506 were similar in the treatments and control. Further studies are required to determine the factors influencing the compatibility of host-plant resistance with quinalphos or NPV; and to examine the potential for increasing the efficacy of these mortality factors when they are used in conjunction with Helicoverpa resistant chickpea.
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