60 



DECIDUOUS FRUIT INSECTS AND INSECTICIDES. 



Two applications were made; the first on June 17, before the bee- 

 tles appeared, and the second on June 23. Infestation on the vine- 

 yard proved to be rather light, and only on the ends of the rows on 

 the west side of the vineyards which adjoined lands given over to 

 the production of grain crops were the beetles at all numerous. 

 Hence there was not a very marked difference between the amount of 

 injury on the sprayed and the check plats, with the exception of a 

 few vines on the ends of the rows where the infestation was heaviest. 

 Here the clusters on the untreated vines were quite ragged as a result 

 of injury by the beetles, whereas upon the treated rows no injury 

 was apparent. In previous years it had always been the custom of 

 the owners of this vineyard to handpick the beetles. This season 

 no % hanclpicking was clone. On a near-by vineyard on the same farm, 

 however, where handpicking alone was depended upon, the injury 

 by the beetles was much more in evidence, and the owners were very 

 sorry that they did not resort to arsenical spraying instead of hand- 

 picking, and have expressed their intention to rely upon spraying as 

 a means of rose-chafer control in the future. 



The vineyard of Mr. C. F. Hirt, in which another experiment was 

 undertaken, is located on sandy soil on the banks of Lake Erie. It is 

 entirely isolated from other vineyards and is adjacent to pastures 

 and general farm lands, and has the reputation of being one of the 

 worst infested vineyards in this rose-chafer infested area. Several 

 years ago the vineyard was practically abandoned on account of the 

 injury done by the rose-chafer. During the past three or four years, 

 however, efforts have been made to control the pest in this vineyard 

 by handpicking; yet in spite of this, beetles wrought considerable 

 injury to the crop. At the opening of the past season the owner 

 was prevailed on to try out the poison-spray method as a means of 

 control, with the understanding that no handpicking was to be done. 

 Accordingly the vineyard, which consists of about 3 acres, was treated 

 in the following manner : 



Rows. 



Bordeaux mixture. 



Arsenate 

 of lead. 



Molasses. 



Water. 



10 



Lime, 3 pounds; copper sulphate, 3 pounds 



Lime, 3 pounds; copper sulphate, 3 pounds 



Check 



Pounds. 

 3 

 3 



None 



50 gallons. 

 49 gallons. 



6 



1 gallon 



4 





8 



None 3 



None 



50 gallons. 











Three spray applications were made, the first on June 8, before 

 the blossom-buds had opened (see fig. 16) and before any beetles 

 appeared. The object of this application was to thoroughly coat all 

 of the blossom-buds and the new growth of foliage, which was com- 

 paratively easy at this date, as the grapevines had not as yet made a 

 very luxuriant growth. The second application was made June 17, 

 Avhen the first beetles appeared upon the vines, and a third on June 



