Study on the biological characteristics of citrus fruit fly and its control.
Citrus fruit fly Tetradacus citri [Bactrocera minax] is becoming one of the main pests in the northwestern citrus producing area of Hubei province, China. It has one generation a year. Its pupae hibernate in the soil; adults emerge in early June and start to mate in mid June; its egg stage is in late June to early July. The egg is mainly laid in the young fruit, after hatching the lavae eat the flesh. The attacked fruitlet skin becomes yellow with some red spots, the fruit falls easily. Practice indicates that for control of the pest, besides picking off the green, yellow and fallen fruit in late April to mid May, spraying a 800x solution of 48% Lorsban [chlorpyrifos], or 90% Crystal Dipterex [trichlorfon], or 50% phoxim, once every 5-7 days for 2-4 times, or dusting granules of 10% phoxim (1 kg + fine soil 50-60 kg) on the ground are effective measures. Suspending bottles with mixed liquid (800-1000x solution of 90% crystal Dipterex) is also helpful.