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Experiments on the Needle Shortening Pine Gall Midge

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(Thecodiplosis brachyntera Schwaegr.) 1968―1971 (Dipt. Cecidomyiidae)

image of Insect Systematics & Evolution

Abstract Data are given on the biology of this gall midge, which has proved harmful to young trees of Mountain and Scots Pine. Special attention has been paid to the flight period as reliable information on this is essential in order to time control measures. These can be carried out as sprays with parathion, diazinon or malathion, which all proved highly effective when applied twice during the flight period. As young nursery trees are most vulnerable, a warning for nurseries is issued by the National Committee for Propagation and Sanitary Inspection for Horticultural Plants every spring, when the first hatchings are noted.

Affiliations: 1: State Plant Pathology Institute, DK-2800 Lyngby, Denmark


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