In the rainy season we see many fruits that fall before the ripe, sometimes yellow fruits and wrinkles, small black spots appear on the skin of fruits. it is a symptom of an attack of fruit fly (bactocera sp, Dacus dorsalis).
Factors that are affect growth in the life cycle of fruit fly including the following:
• Temperature Environment
Fruit fly cycles 8-11 day in ideal conditions. Ideal conditions in question is the temperature around 25-28 ° C. At this temperature fruit fly will have one round in an optimal cycle. While at low temperatures or around 180C, the time required to complete its life cycle is relatively long, slow, which are about 18-20 days. At a temperature of 30 ° C, adult flies that grow will be sterile.
• Availability of Food Media
Number of eggs of fruit fly issued will be reduced if the food shortage. Adult fruit fly that is lack of food will produce small-sized larvae. These larvae are capable of forming small pupa, but often fail to develop into mature individuals. Some may become adults who can only produce few eggs. Viability of eggs was also influenced by the type and amount of food eaten by the larvae of females (Shorrocks, 1972).
Control of fruit flies (tephritidae)
1. Maintain cleanliness. Discard fruit that has been attacked by fruit flies and buried in the ground. Garbage that is around the plant should also be collected and burned or buried in the ground.
2. Use metyl eugenol traps to catch the fruit flies. But do not place the trap in the middle of the planting, preferably on the edge so that flies do not congregate in middle of planting.
3. Wrapping fruits using paper bags, plastic or woven palm before the fruit is attacked by fruit flies.
4. Use of chemical insecticides if fruit fly attack it. Use of synthetic insecticides such as pyrethroids, deltamethrin 25, betasiflutrin 25 EC, lamdasihaltrin 25 EC and sipermetri 100 EC. Spraying in the morning and spray the underside of the leaves evenly.