New York Agricultural Experiment Station. 463 



leaf. During August the caterpillars migrate to the twigs where 

 they spin silken cases on which to pass the winter. These cases 

 are about one-eighth of an inch long, and as they lie close to the 

 bark and resemble it in color are not readily detected. 



The writer has quite frequently found these cases with their 

 hibernating caterpillars on nursery trees about to be shipped 

 from the packing grounds. It is in this manner that the insect is 

 most readily distributed over the country. 



Remedial measures. — Where practicable the trees should be 

 thoroughly sprayed with Paris green, 1 pound to 150 gallons of 

 water, before the buds open in the spring. Two applications will 

 be found better than one, the object being to keep the buds 

 coated with the poison so that the first meal of the caterpillars 

 in the spring will be a poisoned one. Experiments at this Sta- 

 tion have shown that the bud moth can be held in check in this 

 way. 



In nurseries and in orchards, also, serious injury may be pre- 

 vented by cutting out the nests which are rendered conspicuous 

 by the partially dead leaves. This should be done before the 

 moths come forth, thus reducing the numbers of the next brood. 



EXPERIMENTS IN TREATING INFESTED NURSERY 



STOCK. 



Dipping Young Stock Infested with Plant Lice. 



As noted on a previous page, plant lice have been unusually 

 abundant during the past season. Their injurious work has been 

 especially evident in the nurseries. The greatest injury was 

 usually caused to seedling and one-year-old fruit trees. The lice 

 attacked the tender leaves at the tips of the young trees soon 

 causing them to curl so badly that the insects could not be 

 reached with a spray. In the nursery in which the experiments 

 were made the infested trees, principally sweet cherry, apple and 

 pear trees, showed serious injury from the effects of the lice. 

 The experiments were undertaken with a view to determining a 

 practical method of checking the injurious work of the lice. It 



