TRICHOGRAMMA MINUTUM RILEY AS A PARASITE OF THE ORIENTAL FRUIT MOTH (LASPEYRESIA MOLESTA BUSCK.) IN ONTARIO

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Abstract
The investigations described in this paper were carried out during the period 1928–1933, and deal with the egg parasite, Trichogramma minutum Riley, with special reference to its field of usefulness in the biological control of the oriental fruit moth (Laspeyresia molesta Busck.) in Ontario. This cosmopolitan parasite is a factor of considerable importance in regulating the abundance of the fruit moth in southern New Jersey, but appears to be of little practical significance in the natural control of the pest in Ontario. Under certain conditions of weather and host abundance, parasitism may be increased materially by the liberation of Trichogramma in the orchards but, in general, the results are not dependable. A large number of experiments were conducted utilizing three biological races of the species. The technique employed in the work and the results obtained are given as well as a number of important observations on the habits and biology of the parasite.

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