Grey-spotted tortrix

The Grey-spotted tortrix (Choristoneura hebenstreitella) is a moth species belonging to the order Lepidoptera and the family Tortricidae. It is recognized as a significant pest in both forestry and horticulture, known for its ability to infest a wide variety of woody plants and fruit trees.

This pest primarily attacks fruit-bearing trees such as apple, pear, plum, and cherry, as well as several deciduous trees like oak and mountain ash. The larvae are notorious for their broad feeding habits, attacking buds, leaves, flowers, and developing fruits, which often leads to substantial agricultural losses.

The life cycle of the Grey-spotted tortrix typically consists of one generation per year. The insect overwinters as a second-instar larva inside silk cocoons hidden within bark crevices. As soon as spring temperatures rise, the larvae emerge to feed on opening buds and young foliage, marking the start of their damaging phase.

Larval feeding causes the characteristic rolling and webbing of leaves, forming shelters where the insects develop. Beyond leaf damage, the larvae cause direct harm to fruits, resulting in scarring, deformity, and premature fruit drop. These activities compromise the tree's photosynthesis and reduce the overall marketable yield of the orchard.

Management of this pest involves an integrated pest management (IPM) approach. Key strategies include regular monitoring of larval populations, the use of pheromone traps to time treatments, and the application of biological or chemical insecticides during the critical period when larvae emerge from their wintering sites in early spring.