Cooperative Spraying Experiments. 



169 



There was also in our sprayed vineyard but very little of the character- 

 istic " markings " on the leaves made by the beetles in feeding. Late in 

 the season the vineyard was an instructive object lesson along a main 

 road, as the foliage kept green and healthy long after neighboring vine- 

 yards began to look brown and drop their leaves. 



A prominent vineyardist who has been spraying for the root-worm with the 

 arsenate cf lead for two or three seasons reported in October that this past season 

 " excessive rains did much to counteract the effect of the first spraying and yet 

 the results are not less striking than those of last year. On account of high winds 



Fig. 43. — Carbonic-acid gas power sprayer at work tn a vineyard. 



grape root-worm beetles. 



Spraying for the 



I deferred and finally omitted the second spraying in part of one vineyard and I 

 greatly regret the omission, for in this part the beetles came and kept coming until 

 I realized I had made a very serious mistake. All parts of the vineyard sprayed 

 twice are practically free from traces of harm." 



" I think the time is near at hand wlien the efforts of your Experiment Station 

 to protect tlie vineyardist from the root-worm enemy will receive far fuller recogni- 

 tion. It is no longer possible for those whose vineyards have been destroyed to deny 

 or conceal the facts, and there is very little disposition to attribute the ruin to any 

 other cause than the root-worm. Practically all whose vineyards have suffered are 

 now anxiously seeking to know if it is really true that spraying will save their vines. 



