Gold-green weevil

The gold-green weevil (Merhynchites auratus) is a member of the Attelabidae family, commonly known as leaf-rolling weevils. This insect is recognized as a significant pest in pomology, causing considerable damage to fruit-bearing trees throughout temperate climate regions.

The host range of Merhynchites auratus includes a variety of pome and stone fruit trees. Apples, pears, cherries, and plums are among the most frequently attacked. Both adults and larvae can be problematic, as adults feed on buds and leaves, while larvae develop within damaged plant tissues.

The life cycle of the weevil is synchronized with the phenology of host trees. Adults overwinter in the soil and emerge in spring as temperatures rise. Female weevils cut into leaf stalks or young shoots to lay eggs, which causes the specific plant tissue to wither, turn brown, and eventually drop off the tree.

The economic impact of this pest is characterized by severe damage to the current year's fruit production and the overall physiological weakening of the tree. If left unmanaged, the infestation leads to a significant loss of fruit set and can deform the growth patterns of young saplings, reducing the orchard's long-term profitability.

Effective control measures require a combination of monitoring and timely intervention. Chemical control is most effective when applied during the pre-blooming period, targeting adults before they can deposit eggs. Additionally, orchard sanitation, such as removing fallen infested parts, is crucial to reduce the population density for the following season.