Guava fruit fly maggots soft brown rot amrood trap bait bagging sanitation diagnosis season
3 Answers
White maggots inside the fruit with soft, brown, rotting patches and oozing are fruit fly damage, the biggest problem of rainy-season guava. The fly lays eggs under the skin of maturing fruit and the maggots feed inside, so the fruit rots and drops. Confirm by cutting an affected fruit and looking for the legless maggots. The single most effective step is daily sanitation: collect and destroy all fallen and infested fruit by deep burying or sealing in a sun-exposed bag, since rotten fruit on the ground keeps the cycle going. Hang fruit fly traps with a male lure such as methyl eugenol to monitor and trap males, at the number per acre your KVK advises. Bagging individual fruits after they set keeps the fly off and gives clean fruit. Many growers also shift the crop to the winter season (through bahar treatment or pruning on KVK advice), because the winter guava crop has far less fruit fly than the rainy crop. If a bait spray is needed use the spot-patch protein bait method to keep residue low, and follow the label, pre-harvest interval, and residue and MRL limits. Plan the season and trap layout with your KVK.
We switched our main crop to winter on KVK advice and the fruit fly problem dropped hugely. The rainy season fruit was always full of maggots. Daily fallen-fruit pickup is a must.
Bagging the fruit takes labour but the fruit comes out clean and the maggots cannot get in. Traps help us know when the flies are active.