Guava weevil

The guava weevil (Conotrachelus psidii) is a significant insect pest belonging to the order Coleoptera and the family Curculionidae. It is considered one of the primary limiting factors for successful guava (Psidium guajava) cultivation in tropical and subtropical climates.

The host range is primarily focused on guava species. Adult weevils are highly specialized feeders, and their reproductive strategy is intimately linked to the phenology of the guava fruit, which provides both food and a protected environment for the developing larvae.

The lifecycle begins when the female weevil punctures the surface of the fruit to oviposit. The emerging larvae tunnel into the pulp and seeds, consuming the internal tissues. Upon completing their development, they exit the fruit and burrow into the soil to pupate, which is a critical stage for population management.

The damage caused by this pest is severe. Infested fruits typically drop prematurely or become severely deformed, rendering them unfit for market. Furthermore, the entry and exit holes created by the weevil facilitate the entry of secondary pathogens, leading to fruit rot and total crop loss in untreated orchards.

Integrated Pest Management (IPM) strategies for Conotrachelus psidii include:

• Strict sanitation protocols involving the collection and disposal of infested fallen fruit.
• Soil cultivation around the base of trees to expose and destroy pupae.
• Use of targeted insecticides during the adult mating and egg-laying stages.
• Implementation of biological control agents, such as specialized wasps or entomopathogenic fungi.