| Genetic regulation on body color of a mutant strain, JBM of Helicoverpa armigera with black body color of pupae and adults, was investigated. Reciprocal crosses between JBM and JBW (a wild strain with yellow brown body color of pupae and adults) were used to determine the inheritance characteristics of body color. In population cross experiments of JBWxJBM, 303 of offspring adults (F1) have JBW phenotype. In the F2 generation, JBW/JBM was 2.9 to 1. In the BQ(♀F1×♂JBM) generation, JBW/JBM was 1 to 1.2. In the F3 and F1 generation of BQ, no JBW phenotype appeared. In population cross experiments of JBWxJBM(-); F1 population all have JBW phenotype. In the F2 generation, JBW/JBM was 2.8 to 1. In the BQ(♀JBM×♂F1) generation, the ratio of JBW/JBM was 1.1 to 1. In the F3 and F1 generation of BQ generation, no JBW phenotype appeared. In one to one cross experiments of JBWxJBM, 183 of offspring adults (F1) have JBW phenotype. In the F2 generation, JBW/JBM was 3 to 1. In the BC1(♀F1×♂JBM) generation, JBW/JBM was 1.3 to 1. In the F3 and F1 generation of BQ, no JBW phenotype appeared. In one to one cross experiments of JBW×JBM(-); F1 population have JBW phenotype. In the F2 generation, JBW/JBM was 3.1 to 1. In the BQ(♀JBM×♂F1) generation, the ratio of JBW/JBM was 1.2 to 1. In the F3 generation, no JBW phenotype appeared in 115 individuals. And also in F1 generation of BQ, there was no JBW phenotype appeared in 102 individuals.The phenoloxidase activity of different stages and organisms of H. armigera was detected. The result shows that the highest phenoloxidase activity appears in the stage of the 2nd day of the 6th instar larvae, 262.54±53.37. By comparing the phenoloxidase activityof the 2nd day of the 6th instar larvae of JBM and JBW, we can find the activity of JBM is 2.34 more as much as the one of JBW. So, we can deduced that the change of phenoloxidase activity is perhaps one of the reasons which lead to the change of body color.
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