REPORT OF THE STATE ENTOMOLOGIST I91O 35 



Fifth, an adhesive poison, such as arsenate of lead, appears to 

 be much more satisfactory, since it is not only fully as effective in 

 checking the codling moth but appears to be extremely valuable in 

 controlling such leaf feeders as the Tortricid observed upon the 

 orchards in series 2. This insect and associated feeders are un- 

 doubtedly of importance in increasing the amount of wormy fruit. 



. Sixth, there are those who hold the single spray method to be 

 of comparatively slight importance, even if nearly as efficient, 

 because in many localities it is necessary, or has been considered 

 necessary, to spray several times for the control of fungous diseases. 

 Conditions in the Hudson valley are such as to hardly justify the 

 repeated applications so generally in vogue in the western part of 

 the State. Here, at least, we believe that a knowledge of the possi- 

 bilities of one treatment will prove an important factor in encour- 

 aging thorough spraying and result in the more general production 

 of sound fruit. 



JUNIPER WEBWORM 



Diciionieris margineUus Fabr. 



Twigs of Irish juniper infested by a reddish brown, white-striped 

 larva about one-quarter of an inch long were received February 28, 

 1910, from Mr S. G. Harris, Tarrytown. These active larvae 

 webbed the needles together and it was found later that they throve 

 almost as well upon the partially dried foliage as though it were in 

 a succulent condition. A larger amount of material was kindly 

 sent by Mr Harris in March and the species was also received 

 through the State Department of Agriculture from Mr L. D, 

 Rhind, Plandome, L. I. A fine series of moths was reared in late 

 May and early June. These were provisionally identified as the 

 above named species, the determination being confirmed by Mr 

 August Busck of the United States National Museum. 



This European species does not appear to have been previously 

 discovered in America. Its distribution, as given by Dr H. Rebel, 

 is Europe, except the polar regions and Siberia. A number of 

 English localities are indicated by Meyrick in his British Lepidop- 

 tera. This beautiful imported species, easily recognized by its 

 yellowish brown, broadly white-margined fore wings, will hardly 

 l)ecome a serious pest, since its food plant is of very little com- 

 mercial importance. 



Life history. The active larvae are gregarious, spin a rather 



copious web and apparently thrive upon the dead or dying foliage 



almost as well, if not better, than upon the more healthy tissues. 



The transformation to the pupa occurs within the webbed mass, 



2 



