New York Agricultural Experime:nt Station. 249 



Whenever bugs or flea beetles are plentiful add one or two pounds 

 of paris green, two quarts of arsenite of soda stock solution or 

 three to five pounds of arsenate of lead to the quantity of bor- 

 deaux required to spray an acre. 



Thoroughness of application is to be desired at all times, but 

 is especially important when flea beetles are numerous or the 

 weather favorable to blight. The more frequently and thoroughly 

 the plants are sprayed the better. There is no danger of injuring 

 the foliage by too much spraying. Using the same quantity of 

 bordeaux, frequent light applications are likely to be more effective 

 than heavier applications at long intervals; e. g., when a horse 

 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. 



Acknowledgment. Throughout the ten years during which 

 this investigaition has been in progress manv farmers have had a 

 part in the work and given very material assistance. The writers 

 heartily thank these gentlemen for the service they have rendered. 



