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Biological control of the oriental fruit moth



Biological control of the oriental fruit moth



New York geneva Agric Exp Sta Bulletin 635: 1-27



The importance and distribution of Grapholitha molesta in western New York from 1927 to 1932 are considered. By the end of 1931 practically all of the commercial peach area of western New York was infested. Apples are considerably injured and, generally speaking, quinces are 100% infested. The outlook for peach culture has undergone a decided improvement since the establishment of Macrocentrus ancylivorus. This parasite has taken a steadily increasing toll of the twig-infesting larvae, its parasitism rising from 6.63% in 1928 to 25% in 1932. Parasitism by indigenous spp. varied considerably from yr. to yr., due chiefly to fluctuations in the abundance of Cremastus minor and Glypta rufiscutellaris. Coincident with the increasing parasitism by M. ancylivorus there was apparently a decrease in the population level of the fruit moth. In Niagara County the high point of damage was reached in 1929, when 59.89% of the crop was infested with an estimated population of 18,901 larvae per acre. In 1932 these estimates showed only 8,288 larvae per acre with 14.01% of the crop infested. It is believed that similar results may become apparent in the other infested counties when the parasites become firmly established. An account is given of the technic developed for the rearing of both hosts and parasites.

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Accession: 013319752

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