- Even the egg laying process causes damage as there is chance of microorganisms gaining entry into the fruit through the injury formed by the ovipositor on the fruits.
- The emerging larvae tunnel and feed within the fruit which, as a result rot and drop.
- Rotting is aggravated by microorganism .Fruits of all stages are damaged.
- In unprotected gardens damage may be upto the tune of 90-100 %.
Mark out 5 one meter square area at random from the plot. Assess the percentage of fruits damaged and work out the average.