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does not appear. First page follows. Introduction An insect larva collected in Orange County, California, September 30, 1942, in the course of routine inspection work by agricultural officials, proved to be that of the oriental fruit moth, Grapholitha molesta (Busck). The discovery that this destructive insect had become established in California immediately created a situation which required the concerted action of entomologists and state agricultural officials. On the basis of earlier studies concerning the behavior and economic importance of this insect in other regions, the assumption seemed reasonable “that it would be a serious pest of deciduous fruit in California, particularly in view of the extensive production here of late canning peaches” (Smith, Essig, et al., 1933).6 The California State Legislature within a few months appropriated for use of the California Department of Agriculture over $800,000 for the eradication of the moth if surveys indicated eradication to be practical, and for research involving biological and chemical control (Mackie, 1944). The surveys showed, however, that the moth was so widespread in the peach-growing areas that the proposed eradication campaign was inadvisable. The program then resolved itself into retarding the spread of the moth into uninfested districts, the development of methods of control for use when control became necessary, and the introduction and release of insect enemies. A part of the policy of trying to delay spread of the pest was the program of mass production and colonization of the parasite Macrocentrus ancylivorus Roh. in those areas revealed by the survey to be infested, since Macrocentrus had proved to be the most effective control of the oriental fruit moth in eastern states.

Mass culture ofMacrocentrus ancylivorusand its host, the potato tuber moth