Two-tubercled weevil

The Two-tubercled weevil (Anthonomus bituberculatus) belongs to the order Coleoptera and the family Curculionidae. This insect is a specialized pest that primarily affects various Rosaceae species, frequently appearing in orchards and fruit-bearing tree populations throughout its distribution range.

The primary hosts of this pest are apple and pear trees, as well as several wild shrubs like hawthorn. The weevil causes significant issues by targeting the buds and flowers of these plants, which directly affects the formation of fruit and the overall health of the tree's reproductive structures.

Regarding its biology, the adult weevil hibernates in soil or plant debris. As soon as temperatures rise in the spring, the beetles emerge and begin feeding on developing buds. The life cycle consists of egg, larval, pupal, and adult stages, with larvae developing inside the plant tissues, often causing them to wither and die prematurely.

The damage caused by Anthonomus bituberculatus is primarily concentrated on the reproductive organs. By piercing the buds and laying eggs within them, the weevil prevents the flowers from blooming or developing into fruit. High infestations can lead to a drastic reduction in yield, sometimes causing complete failure of the fruit set in severely affected orchards.

Effective control measures require an integrated approach. Cultural methods include maintaining cleanliness in orchards to reduce hibernation sites. Chemical control involves the application of appropriate insecticides during the pre-blossom stage, ensuring that the population is reduced before severe damage occurs to the crop buds.

• Regular field monitoring during the early bud-burst stage.
• Implementation of sanitation practices to eliminate overwintering sites.
• Targeted insecticide applications based on economic injury levels.