Mango gall midge

Taxonomic classification: The mango gall midge (lat. Oligotrophus mangiferae) belongs to the order Diptera and the family Cecidomyiidae. This insect is a specialized pest that has evolved to survive and reproduce specifically on mango trees, often causing significant issues in tropical horticulture.

Affected crops: The primary host for this species is the mango tree (Mangifera indica). The midge focuses its attack on young, developing leaves and floral buds, which are the most vulnerable parts of the tree during the growth season.

Biology and lifecycle: The lifecycle of Oligotrophus mangiferae is strictly dependent on the host plant's flush cycles. Female midges deposit eggs into the leaf or floral tissue. Once the larvae emerge, they feed internally, causing the plant to form characteristic galls—abnormal tissue growths that protect the larvae and serve as their food source until they pupate.

Damage and economic impact: The damage manifests as small, localized swellings or galls on the leaves and sometimes on the inflorescences. This interference with plant physiology causes leaf distortion, reduces photosynthetic efficiency, and often results in blossom drop, which directly translates to lower fruit yield and reduced quality of the mango crop.

Control measures: Managing the mango gall midge requires an integrated approach to reduce population levels effectively. Key strategies include:

• Regular field scouting to identify the first signs of gall formation.
• Pruning and destroying infested plant parts to reduce the localized population of larvae.
• Applying systemic insecticides during the peak activity of adult midges to prevent oviposition.
• Promoting the activity of natural predators and parasitoids that feed on midge larvae.