New York Agriculturat. Experiment Station. 45 



subject to injuries by the mite. Generally one application of 

 either of these sprays has prevented the spotting of the foliage. 



The caterpillars, or larvae, of the tussock moth damage young 

 apple and pear fruits. This pest seldom appears in destructive 

 numbers. When it does, the egg masses should be collected and 

 destroyed and arsenical sprays should be used to prevent devasta- 

 tion by the caterpillars. 



The very serious pest in the grape regions of New York, espe- 

 cially in Chautauqua county, is the grape leaf hopper and the 

 results of our experiments appear on the following pages in a 

 summary of Bulletin No. 344. 



The ermine moth, an insect of somewhat recent importation, 

 and the pear thrips, an insect very destructive in certain sections 

 of the State, especially in the Hudson Eiver valley, have also been 

 studied and the results of the investigations and experiments 

 appear later in the summaries of Technical Bulletin No. 24 and 

 Bulletin No. 343. 



In view of the fact that cabbage growing is an important 

 industry in this State, much attention has been given to insects 

 attacking the cabbage plant, particularly the turnip flea beetle and 

 the cabbage maggot. An efficient prevention of the depredation 

 of these insects, particularly the maggot, was fomid in the 

 screening of cabbage seed beds with cheesecloth. This method of 

 growing the young plants conserves the moisture in the bed, raises 

 the temperature and furnishes congenial conditions for growth 

 so that plants under cloth start sooner, grow faster and reach 

 the desired size a week or ten days earlier than plants in the open. 

 Moreover, this screening completely protects the seedlings from 

 maggot injury with the result that the growing crop is not injured 

 by this insect. It was found, also, that certain grades of cheese- 

 cloth would prevent injury by the flea beetles. 



Some seven years ago the apple growers of the State were 

 greatly concerned over the spread and destructive effects of the 

 San Jose scale, an insect that first made its appearance in this 

 country in California, and through the distribution of nursery 

 stock and by other means, has spread over a large portion of the 



