ISTew York Agricultural Experiment Station. 839 



power sprayer carrying but one nozzle per row is used, it is better 

 to go over the plants once a week than to make a double spraying 

 once in two weeks. In the first two sprayings, while the plants 

 are small, one nozzle per row may be sufficient; but when the 

 plants become large at least two nozzles per row should be used. 

 Large vines are especially liable to blight and should be sprayed 

 very thoroughly. Such vines will be somewhat injured by the 

 wheels of the sprayer, but the benefit from spraying will far out- 

 weigh the damage done. 



A single spraying is better than none and will usually be 

 profitable, but more are better. Spraying may prove highly 

 profitable even though the blight is only partially prevented. It 

 is unsafe to postpone spraying until blight appears. Except, per- 

 haps, on small areas, it does not pay to apply poison alone for 

 bugs. When it is necessary to fight insects bordeaux mixture and 

 poison should be used together. For the best results, spraying 

 should be continued as long as the plants live. It is a mistake to 

 discontinue spraying because the weather is dry and no blight 

 present. A late attack of blight may result in heavy loss from 

 rot. As a rule, those who spray most obtain the largest net profit. 



