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The fruit fly ( Bactrocer a spp.) is a serious threat of developing chili and watermelons in Indonesia. Chili growers rely mainly on synthetic insecticide use to control the pest. Excessive use of the insecticides could cause resistance in the pest, environmental issues, and health issues to the consumers. Thus, alternative control methods should be developed, such as a polyculture cropping system. The study was conducted in Rompegading Village, Cenrana District, Maros Regency, from August to October 2018. The purpose of the study was to evaluate a polycultural cropping system, using 2 plant species: chili plant and watermelon as the main and secondary crops. Five schemes of cropping model were tested in this study, namely: (a) chili without mulch, (b) chili with plastic mulch, (c) chili and watermelon, (d) watermelon only, and (e) chili with farmers’ cultivation practice. The percentage of fruit fly attack on the chili and watermelon fruit were calculated. The results showed that the chili with plastic mulch treatment had 90.1%, pepper and watermelon treatment had 93.03%, and farmers’ practices treatment had 83.3% of the fruits damaged by the fruit fly. While the percentage of watermelon damaged by fruit flies was the highest in the treatment of chili and watermelon (50.00%).

The fluctuation of fruit fly attack (Bactrocera spp.) in a polycultural system of chili and watermelon crops