Pine shoot moth

Taxonomic position: The brown pine shoot moth (Rhyacionia pinivorana) belongs to the order Lepidoptera and the family Tortricidae. It is a significant pest primarily known for affecting coniferous trees, particularly in managed forests and nurseries.

Host plants: The primary host is the Scots pine (Pinus sylvestris). Other species of pine may also be susceptible depending on regional conditions. The pest exhibits a strong preference for young trees, impacting their development during the critical stage of height growth.

Biology and life cycle: The adult moths emerge in late spring. Eggs are laid on needles or buds. Upon hatching, larvae burrow into the current year's shoots. The larva overwinters within the shoot tissue and completes its development by pupating within the hollowed-out shoot in the following spring.

Damage and severity: Larval feeding destroys the pith of the shoots. This results in the death of the terminal bud, causing shoot deformation, stunted growth, and in severe cases, the development of multiple leaders. Repeated attacks significantly reduce the economic value of timber and the aesthetic appeal of ornamental pines.

Control measures: Managing the brown pine shoot moth requires integrated pest management (IPM) practices:

• Monitoring flight activity using pheromone traps to time treatments correctly.
• Physical removal and destruction of infested shoots before the adult emergence.
• Use of systemic insecticides during the early larval stage for effective control.
• Silvicultural practices that promote rapid growth and healthy stand density.