336 JOURNAL OF ECONOMIC ENTOMOLOGY [Vol. 14 



cipitation than it is in Oregon where there is very little rain during the 

 svimmer months. Here again the washes containing naphthalene show 

 up to best advantage, and have given a satisfactory control. 



This uniformity of results from the use of the naphthalene washes is 

 especially pleasing, and we believe warrants further tests of this mate- 

 rial. We would be greatly interested in having other workers on this 

 problem test the use of naphthalene as an active agent in washes for the 

 control of either the Eastern or Western Root Borer. 



PARASITISM AND NICOTINE IN THE CONTROL OF THE 

 ORIENTAL PEACH MOTH: A SECOND REPORT 



By Louis A. Stearns, Associate Entomologist, Virginia State Crop Pest Commission 



In respect to its distribution in Virginia, the status of the oriental 

 peach moth, at the present time, remains unchanged. The Virginia 

 infestation is still a well defined area within a few miles of Washington 

 city. Hefe, however, there are indications of the increasing destruc- 

 tiveness of the species. 



Collections have shown that within three years the nimibers of the 

 insect have been practically doubled. It has established itself with 

 surprising rapidity in isolated plantings of young peach. That the 

 pest has not spread by natural means to the important fruit-growing 

 district of extreme northern Virginia is due possibly to a strip of for- 

 ested and farming land some thirty miles in width intervening. 



The lowest record, in 1920, of average infestation in small home-gar- 

 den plantings of two-year old peach, based on twig counts, was 37 per 

 cent, while in the case of individual trees, the injury ran as high as 81 

 per cent. In one instance, injury in a block of budded peach stock was 

 found to exceed 85 per cent of all terminals. 



A study made in an established orchard of the comparative growth 

 of 600 uninfested and infested peach twigs of trees distributed among 

 the varieties Belle, Bilyeu, Carmen, Elberta, Heath, Hiley, Salway 

 and Smock produced interesting data. These trees, averaging eight 

 years, had received a moderate winter pruning. The injury was due 

 entirely to infestation by first brood larvae, at the time an average 

 growth of 4.4 inches had been made. Contrar^^ to the accepted idea, 

 the major injur}' (83 per cent) was to lateral rather than to terminal 

 growth from the year-old wood. Often, this injury was a gouging of 



