AND OTHER INjrRIOUS INSECTS OF ICJO"/ AND I908. 87 



Number of Sprayings. Dates Sprayed. Results. 



None (check trees) 53% Marketable 



2 Sprayings June 17 and June 24 62% Marketable 



3 Sprayings May 29, June 17 and June 24. . .77% Marketable 



The common Sclerotinia rot of the phim was so destructive in 

 1907, that in 1908 it was decided to use a fungicide with the arsen- 

 ate of lead. Consequent!}^, Bordeaux mixture (3 lbs. copper sul- 

 phate, 4 lbs. lime, 50 gals, water) plus three pounds of arsenate of 

 lead was used. 



The spring of 1908 started in very early, and the buds began 

 to swell, some fruit buds showing white by the last of April, and 

 because of this the first spraying was done as early as May 2nd. 

 A cold period following this, the second spraying was delayed until 

 Alay 27th. The trees were sprayed the third time on Jtme 4th. 

 The results are as follows : 



Percentage of 

 Number of Sprayings. When Sprayed. marketable fruit. 



Unsprayed 40% 



2 Sprayings May 2, May 27 62% 



2 Sprayings May 27, June 4 74% 



3 Sprayings May 2, May 27, June 4 86.4% 



In the comparison of these tables it is interesting to observe 

 that the first spraying in both years gives results in favor of the 

 early spraying. The result in 1908 is difficult to explain because 

 the Curculios were not active to any extent until after May 30th, 

 and yet this first spraying was given on May 2nd, a period of at least 

 three weeks intervening before the Curculio began to work. The 

 only reasonable explanation seems to be that the arsenic from the 

 first spraying clung to the buds so that it was eiTective when the 

 Curculios made their appearance. 



In testing for Curculios it was very interesting to note the 

 proportion of beetles found on the sprayed and unsprayed trees. 

 For instance : On June 10th, jarring one unsprayed tree we obtained 

 eight Curculios, while upon jarring three sprayed trees none were 

 obtained. On July 2nd upon jarring three unsprayed trees three 

 Curculios were found, and from the same number of sprayed trees 

 none were found. 



From July 2nd to July 12th, trees were shaken every day, and 

 not a Curculio was obtained from a sprayed tree, although at least 

 one a day was taken from a check tree. 



