U. S. D. A., B. E. Bui. 80, Part III. D. F. 1. 1., August 12, 1909. 



PAPERS ON DECIDUOUS FRUIT INSECTS AND INSECTICIDES. 



ADDITIONAL OBSERVATIONS ON THE LESSER APPLE 



WORM. 



(Enarmonia prunivora Walsh.) 



By S. W. Foster and P. R. Jones, 



Engaged in Deciduous Fruit Insect Investigations. 



INTRODUCTION. 



The prevalence of the lesser apple worm throughout the apple- 

 growing districts of the United States east of the Rocky Mountains, 

 as was pointed out by this Bureau in 1908, has awakened considerable 

 interest among apple growers and others, and as the insect has become 

 better known its importance as a pest is more fully realized. Espe- 

 cially noticeable is the late fall injury caused by the later broods, some 

 of the larvae of which work in the fruit for weeks after the crop is 

 harvested. 



The principal purpose of the present paper is to record additional 

 information on the life history and habits a of the insect, and to 

 give a description of the egg, which was first observed during the 

 summer of 1908, both at Siloam Springs, Ark., and in the insectary 

 of the Bureau of Entomology, at Washington, D. C. 



It is also desirable to separate, in so far as possible, the injurious 

 work of the lesser apple worm from that of a larva of another species 

 which closely resembles it, and which latter feeds on the twigs as well 

 as the fruit at certain seasons of the year. 



All life-history studies were made under normal out-of-door con- 

 ditions. The senior author, with the cooperation of Mr. E. L. Jenne, 

 made the observations at Siloam Springs, Ark., and the junior 

 author, who also furnished the description and photomicrograph 

 of the egg, conducted the observations at Washington. 



a The history, distribution, and character of injury of this species have been fully 

 given by Mr. A. L. Quaintance in Bui. 68, Part V, of this Bureau, and reference to 

 these points will be omitted here. 



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