126 



DECIDUOUS FRUIT INSECTS AND INSECTICIDES. 



THE PLUM CUECULIO. 



Throughout the season the drop-fruit and the fruit on trees at 

 picking time from four of the plats in the Jones orchard were care- 

 fully examined as to injury by the plum curculio. The results of 

 examinations are given in detail in Table VII. 



Table VII. — Injury by plum curculio for entire season on Plats I, III, IV, and V, 

 sprayed in the codling-moth experiments. Siloam Springs, Ark., 1909. 



PLAT I. ONE-SPRAY. 





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





Tree 1. 



Tree 2. 



Tree 3. 



Tree 4. 



Tree 5. 



Tree 6. 



Tree 7. 



Tree 8. 



Number of punctures 



1,979 

 1,179 

 4,510 

 5,689 

 79.27 



1,713 

 915 



3,898 

 4,813 

 80.98 



2,613 

 687 

 3,109 

 3,796 

 81.90 



683 



387 



2,363 



2,750 



85.92 



268 



208 



3,238 



3,446 



93.96 



1,012 

 532 

 3,236 

 3,768 

 85.88 



638 



370 



2,937 



3,307 



88.81 



1,200 



706 



Number of fruit punctured 





4,737 





5,443 





87.02 









Number of punctured and sound fruit, etc., 

 per tree in each plat. 



Total for 



Total per 



cent fruit 



free from 



injury. 





Tree 9. 



Tree 10. 



Tree 11. 



Tree 12. 



Tree 13. 





642 



364 



3,280 



3,644 



90.01 



319 



216 



2,436 



2,652 



91.85 



642 



335 



3,560 



3,895 



91.39 







11,709 



5,899 

 37, 304 

 43,203 



































86.34 













PLAT III. ONE-SPRAY. 



Number of punctures 



Number of fruit punctured 



Number of fruit free from injury- 

 Number of fruit 



Per cent free from injury 



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



Tree 1. 



2,321 

 1,051 

 3,698 

 4,749 



77.86 



Tree 2. 



721 



349 



2,339 



2,688 



87.01 



Tree 3. 



919 

 533 



2,211 

 2,744 

 80.57 



Tree 4. 



788 



368 



2,284 



2,652 



86.12 



Tree 5. 



560 



358 



1,883 



2,241 



84.02 



Tree 



1,790 

 795 

 2,775 

 3,570 

 77.73 



Tree 7. 



1,756 

 727 

 2,154 

 2,881 

 74.76 



Tree 8. 



732 

 372 



1,620 

 1,992 

 81.32 





Number of punctured and sound fruit, etc., 

 per tree in each plat. 



Total for 

 plat. 



Total per 

 cent fruit 

 free from 

 injury. 





Tree 9. 



Tree 10. Tree 11. 



Tree 12. 



Tree 13. 





1,629 

 727 

 •1,493 

 2,220 

 67.25 











11,216 



5,280 

 20,457 

 25, 737 

















Number of fruit free from injury 















Per cent free from injury 











79.48 

















