Gall midges

Z,Z )-4,7-tridecadienyl-(5 )-2-yl acetate was identified as the pheromone of the female Douglas-Fir cone gall midge, Contarinia oregonesis Foote (Diptera Cecidomyiidae). The 7 isomer was behaviorally benign. ... 

Fig. 5.8. Gall midge larvae (without feet, orange) feed on aphids.

The larvae have stronger mouth parts and weaker legs than ladybird larvae and feed on aphids, spider mites, gall midges, thrips and scale insects. 

SUMMER INSPECTIONS. In the summer inspections, the main places where the young caterpillars live (gall midge leaves, leaves which have not yet opened at the tips of the shoots, old winter hiding-places, and principal veins on the underside of the leaf) are examined. 

Avoid damage to canes, e.g. by suppressing the raspberry cane gall midge or by removing too strong canes with torn bark. 

Orseolia oryzae (Wood-Mason) rice gall midge adult T 77 ... 

Liu Y-J, Hall D, Cross J, Farman D, Amarawardana L, Liu Q-R, He X-K. (2S,8Z)-2-butyroxy-8-heptadecene major component of the sex pheromone of chrysanthemum gall midge, Rhopalomyia longicauda. J. Chem. Ecol. 2009 35 715-723. 

Leaves with spots. Cause Tuliptree spot gall. Circular brown or purple spots surrounded by a circle of yellow on the leaves reveals the presence of tuliptree spot gall, caused by a kind of midge. Damaged leaves may fall early. While unsightly, the problem is not serious and is best countered by removing all affected fallen leaves. 

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