148 



Report of the Botanist of the 



there was no further trouble from them. The unsprayed rows were 

 treated with paris green in water, July 22, and the " bugs " all killed. 



On September 4 a third spraying with bordeaux alone was given 

 to six rows on either side of the two unsprayed rows of each variety. 

 Thus the field as a whole had but two sprayings while a few rows 

 next the unsj^rayed rows were sprayed three times. 



The sprayings was done with a " Planet " double-acting pump at- 

 tached to a 50-gallon barrel mounted on a home-made, two-wheeled 

 cart hauled by one horse (Plate XV). A boy did the driving and 

 pumping while two men held each a nozzle at the end of a lead of 

 hose. The cost of this outfit was about $17. Water was obtained 

 from a well about 60 rods distant. 



Strange to say there was scarcely any blight {Phytophthora) in 

 this field until at the very close of the season. In fact, but few fields 

 in the vicinity were affected to any extent. The soil was a rich, 

 sandy loam. There was a rank growth of vines which completely 

 covered the ground although the hills were three feet apart each 

 way. As late as September 24 the plants still had three-fourths of 

 their foliage and it was impossible to distinguish the unsprayed rows. 

 There was no difference whatever between the sprayed and unsprayed 

 plants. However, Dobson Bros, report that just before the plants 

 died there was a marked difference which could be seen at a long" 

 distance. 



lender these conditions no marked increase in yield could be ex- 

 pected. The yields are given in the following table: 



Table VIII. — Yields in the Dobson Experiment. 



