Effect of X-ray Irradiation on Pupal Development of Bactrocera zonata and Bactrocera dorsalis under Laboratory Conditions

The studies were performed to check the effect of X-ray doses such as 20, 40, 60, 80 and 100 Gy on the Bactrocera zonata (Saunders) and Bactrocera dorsalis (Hendel) pupae reared on different diets. The laboratory strains of the Peach fruit fly and Oriental fruit fly reared on Guava, Mango and artificial diets.  Results showed a significantly (P<0.05) greater number of deformed adults (Males and Females) of B. zonata at 100 Gy dose of x-ray irradiation followed by B. dorsalis obtained from artificial diets. Less deformity in adults of both fruit fly species was found at the same dosage of irradiation when maggots tended on mango. Similarly, a reduced number of normal adults of both fruit flies were recorded at 100 Gy dose of X-rays reared on an artificial diet.  Reduced pupal emergence was recorded on an artificial diet. From the above results, it is determined that B. zonata is more tolerant to different irradiation doses. Results of the present investigation would be useful to control or target fruit fly pupae in fruits of trade commodities as these pests are universally regulated as quarantine pests.