Nettle weevil

The Nettle weevil (Phyllobius pomaceus) is a member of the Curculionidae family within the order Coleoptera. While often found on nettles, it is also a well-known pest in horticultural settings, frequently attacking the foliage of various fruit trees and ornamental shrubs during the spring and early summer seasons.

The adult beetles feed primarily on the leaves of host plants, including apple, pear, plum, and cherry trees. The larval stage of this weevil occurs underground, where they feed on the roots of grasses and other herbaceous plants. This underground phase can lead to overlooked infestations that may eventually affect the overall vigor of the host plant environment.

The biological cycle typically completes one generation per year. The larvae overwinter in the soil, pupating as temperatures rise in the spring. Adult emergence usually aligns with the bud break and leaf development of fruit trees, providing them with immediate access to tender foliage, which is essential for their nutritional needs before reproduction.

The damage caused by the Nettle weevil is distinct, characterized by notched or serrated leaf edges. When populations are high, the beetles can cause significant defoliation, which stresses the tree, reduces photosynthetic capacity, and can eventually impact fruit yield and tree development if the infestation persists over several seasons.

Integrated pest management strategies are crucial for controlling this weevil. Cultural practices such as cultivating the soil beneath tree canopies can disrupt the larval development stage. If chemical control is necessary, applying approved insecticides during the early stages of adult activity can effectively reduce population density and prevent extensive foliage damage in the orchard.