92 



DECIDUOUS FKUIT 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. 



Number of punctured and sound apples, etc., per tree in each plat. 



Total 



for 



plat. 



Total 

 per 





Tree 

 1. 



Tree 

 2. 



Tree 

 3. 



Tree 

 4. 



Tree 

 5. 



Tree 



6. 



Tree 



7. 



Tree 



8. 



Tree 

 9. 



Tree 

 10. 



cent of 



of fruit 



free 



from 



injury. 



Number punctures 



Number fruit punc- 



1,333 



987 

 20, 478 

 21,465 



95.40 



677 



321 

 8,839 

 9,160 



96.49 



618 



397 

 8,871 

 9,268 



95.71 



747 



471 

 9,054 

 9,525 



95.05 



864 



522 

 8,262 



8,784 



94.05 



757 



483 

 6,104 

 6,587 



92.66 



835 



476 

 5,928 

 6,404 



92.56 



819 



542 

 6,510 

 7,052 



92.31 



369 



239 

 5,405 

 5,644 



95.76 



210 



123 

 2,455 



2,578 



95.22 



7,229 



4,561 

 81,906 

 86,467 





Number sound fruit 





Per cent free from in- 



94.72 











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 



Per cent free from in- 

 jury 



855 



1,025 



563 



744 



113 



271 



231 



314 



149 



223 



4,488 



428 

 6,936 

 7,364 



584 

 6,140 

 6,724 



544 

 7,563 

 8,107 



516 

 7,086 

 7,602 



107 

 1,918 

 2,025 



156 

 3,245 

 3,401 



143 

 3,667 

 3,810 



202 

 5,748 

 5,950 



90 

 3,015 

 3,105 



112 

 3,037 

 3,149 



2,882 

 48,355 

 51,237 



94.20 



91.31 



93.28 



93.21 



94.71 



95. 41 



96.24 



96.60 



97.10 



96.44 





94.37 



PLAT III. UNSPRAYED. 



917 



311 



332 



483 



231 



168 



683 



146 



342 



620 



4,233 



673 

 5,267 

 5,940 



246 

 2,085 

 2,331 



297 

 3,257 

 3,554 



344 

 3,071 

 3,415 



165 

 2,064 

 2,229 



128 

 1,497 

 1,625 



463 

 4,762 

 5,225 



81 

 1,275 

 1,356 



283 

 2,423 

 2,706 



434 

 3,569 

 4,003 



3,114 

 29,270 

 32,384 



88.67 



89.44 



91.64 



89.92 



92.59 



92.12 



91.13 



94.02 



89.54 



89.15 





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 



