Raspberry blossom beetle

Taxonomic classification: The beetles of the genus Heterhelus belong to the order Coleoptera and the family Nitidulidae (sap beetles). These small beetles are known as significant pests in orchards and berry plantations.

Host plants: The primary host is the raspberry plant (Rubus idaeus). The beetles target the buds and flowers of these plants, causing significant economic losses for commercial growers and home gardeners alike.

Biology and life cycle: Adults overwinter in the soil or under leaf litter. As temperatures rise in early spring, they emerge and migrate to the buds of raspberry canes. Females deposit eggs inside the buds. Larvae hatch and feed on the developing floral parts before dropping to the ground to pupate in the soil.

Nature of damage and pest status: The feeding activity of adults and larvae leads to the death of the buds. Damaged buds dry out, turn brown, and fall off, which directly results in poor fruit set and reduced yields during the harvest season.

Protection measures: Integrated pest management strategies are crucial for controlling Heterhelus:

• Cultivating the soil around the bushes in autumn and spring to disturb pupation sites.
• Prompt removal and disposal of infested buds to reduce the next generation.
• Applying insecticides during the early bud development stage, before blossoms open.
• Monitoring beetle emergence using traps or visual inspection to time chemical interventions.