92 



DECIDUOUS FRUIT INSECTS AND INSECTICIDES. 



Table V. — Injury by the plum curculio for entire season. Plats I, II, and III. Fishers- 



ville,Va., 1910. 



PLAT I. LIME-SULPHUR DEMONSTRATION. 



PLAT II. ONE-SPRAY METHOD. 



Number punctures 



Number fruit punc- 

 tured 



Number sound fruit 



Number fruit 



Per cent free from in- 

 jury 



Number punctures 



Number fruit punc- 

 tured 



Number sound fruit 



Number fruit 



Percent free from in- 

 jury 



94.37 



PLAT III. UNSPRAYED. 



90.38 



On the demonstration plat the percentage of fruit uninjured by the 

 curculio was 94.72, and on the one-spray plat 94.37, which shows only 

 0.35 per cent in favor of the demonstration plat. The unsprayed 

 plat shows 90.38 per cent free from curculio injury. As has been 

 noted, the check trees were in the center of the orchard and sur- 

 rounded by sprayed trees, which no doubt accounts largely for the 

 high percentage of sound fruit on the check plat. 



EXPERIMENTS IN MICHIGAN. 



The experiments in Michigan during the season of 1911 were carried 

 out in Mr. Edward Hutchins's orchard near Fennville, Mich. The 

 entire orchard, consisting of 205 trees, was used for the experimental 

 and demonstration spraying, the experimental part being located in 

 the western portion of the orchard where the principal varieties are 

 Baldwin and Rhode Island Greening. The plats were laid off across 

 these varieties in order to have both represented in each plat. (See 

 fig. 24.) The east side of the orchard is composed of a general mix- 

 ture of many varieties. Trees of each plat from which the fruit was 



