Mango gall midge

Systematic position: The mango gall midge (Procontarinia matteiana) belongs to the order Diptera and the family Cecidomyiidae. It is a significant pest primarily affecting mango orchards, causing localized damage to the foliage of the host plants.

Host plants and damage symptoms: The primary host is the mango tree (Mangifera indica). The pest is characterized by the formation of small, round or oval galls on the leaves. These galls vary in color from light green to brown as they mature. Severe infestation leads to leaf curling, distortion, premature yellowing, and eventual leaf drop, which significantly impacts the tree's health.

Biology and life cycle: The lifecycle of Procontarinia matteiana involves eggs, larvae, pupae, and adults. Adult females deposit eggs into the leaf tissues. Upon hatching, the larvae begin feeding, inducing the formation of the gall. The larva develops inside the gall, completes its larval stage, and pupates within this protective structure before emerging as an adult to restart the cycle.

Economic impact: Heavy infestations of this gall midge significantly reduce the photosynthetic surface area of the tree. This reduction in energy production affects fruit set, fruit quality, and overall yield. In nurseries or young orchards, the damage can be particularly detrimental, leading to stunted growth and reduced vigor of the saplings.

Protection measures: Management of the mango gall midge requires an Integrated Pest Management (IPM) approach:

• Pruning and destroying infested leaves to reduce the primary inoculum.
• Application of systemic insecticides during the peak adult emergence window.
• Biological control through the preservation of naturally occurring parasitoids.
• Maintaining healthy orchard practices to improve the overall resilience of the mango trees.