Constructed model of cost/benefit analysis strategy for stem corn borer Sesamia cretica

An integrated pest management model of Cost/Benefit analysis strategy was constructed for stem corn borer Sesamia cretica using complementary control measures of different resistant genotypes of corn with the chemical insecticide diazinon 60%. Based on Cost/Benefit analysis result, the resistant genotype (SAKHA) provides maximum economic value of production at the model point where no spray of insecticide is applied. The applications of one or two sprays do not justify the use of chemical insecticide but rather result in economic loss since the reduction of borer damage value, due to diazinon use, is lower than the cost of control (spray). However, the applications of one spray for the moderate resistant genotype (IPA 2052) and two sprays for the sensitive genotype (CML 323) during corn growing season would be of value to cover the cost of control (spray) but do not achieve similar economic value of revenue comparing with the resistant genotype.