Douglas-fir cone gall midge

Adı : Douglas-fir cone gall midge

Bilimsel Adı : Contarinia oregonensis Foote

Douglas-fir cone gall midge - Contarinia oregonensis Foote is a species of gall midge that affects Douglas-fir trees. This insect is native to North America, specifically in the Pacific Northwest and Rocky Mountain regions of the United States.
The adult midge is a small fly that is about 2 to 3 millimeters in length. The females lay their eggs on the opening buds of Douglas-fir cones in the spring. The larvae then hatch and feed on the new growth of the cones, causing them to form galls, or abnormal growths, that can be over 2 centimeters in diameter. The galls are green when first formed, but later turn brown as the larvae mature inside.
Infestations of Douglas-fir cone gall midge can cause a decrease in the growth and health of affected trees. The galls may also provide shelter for other pests, such as fungus and insects, which can cause additional damage.
Management of this pest includes pruning infected cones and removing them from the area. Insecticides may also be used, but they must be applied early in the season before the larvae enter the cones. Biological control, such as the use of natural predators, has also been explored as a potential management strategy.
Overall, the Douglas-fir cone gall midge is a significant pest of Douglas-fir trees, and proper management is crucial in protecting tree health and preventing further damage.