134 



DECIDUOUS FRUIT INSECTS AND INSECTICIDES. 



Table XIII. — Injury by plum curculiofor entire season, Plats V, VI, and VIII. Crozet, 



Va., 1909. 





PLAT V. DEMONSTRATION. 













Number of punctured and sound apples, etc., per 

 tree in each plat. 



Total 

 for 



plats. 



Total 

 per cent 

 of fruit 





Tree 

 1. 



Tree 

 2. 



Tree 

 3. 



Tree 

 4. 



Tree 

 5. 



Tree 

 6. 



Tree 



7. 



Tree 



8. 



free from 

 injury. 





157 

 115 

 687 

 802 

 85.66 



275 



187 



1,272 



1,459 



87.18 



163 

 103 

 616 

 719 

 85.67 



524 



345 



2,070 



2,415 



85.71 



668 



463 



1,569 



2,032 



77.21 



162 



114 



1,194 



1,308 



91.28 



395 



267 



2,747 



3,014 



91.14 



328 



252 



2,076 



2,328 



89.17 



2,672 



1,846 



12,231 



14,077 





No. fruit punctured. 















86.89 







PLAT VI. ONE SPRAY. 



No. punctures 



No. fruit punctured 



No. sound fruit 



No. fruit 



Per cent free from injury. 



1,510 

 961 



1,617 

 2,578 

 02. 72 



1,290 

 730 

 1,803 

 2,533 

 71.17 



2,143 

 1,347 

 3,758 

 5,105 

 73.61 



360 



238 



1,080 



1,318 



81.94 



1,095 

 719 

 2,526 

 3,245 

 77.84 



647 



405 



1,574 



1,979 



79.53 



775 



521 



1,520 



2,041 



74.96 



511 

 1,528 

 2,039 

 74.93 



8,644 



5,432 



15,406 



20,838 



73.93 



PLAT VIII. UNSPRAYED. 



No. punctures 



No. fruit punctured 



No. sound fruit 



No. fruit 



Per cent free from injury. 



2,746 

 1,255 

 2,168 

 3,423 

 63.30 



2,571 

 1,571 

 2,111 

 3,682 

 57.33 



705 

 437 

 379 

 816 

 57.33 



962 



531 



485 



1,016 



46.44 



2,490 

 1,415 

 1,696 

 3,111 

 47.73 



1,939 

 1,193 

 1,795 

 2,988 

 60.00 



1,865 

 1,098 

 882 

 1,980 

 44.54 



2,300 

 1,285 

 806 

 2,091 

 38.54 



15,578 

 8,785 

 10,322 

 19, 107 



54.02 



The percentage of fruit uninjured by the curculio in the demonstra- 

 tion block, 86.89 per cent, shows a gain over that of the one-spray 

 plat, 73.93 per cent, of 12.96 per cent, and the gain in percentage of 

 uninjured fruit on the demonstration over the unsprayed plat is 

 32.87. 



Orchard of Strathmore Orchard Company. 



The orchard of the Strathmore Orchard Company is located near 

 Mount Jackson, in the Shenandoah Valley of Virginia. The size of 

 the trees and general appearance of the orchard are indicated in 

 Plate XI, figure 1. The location of the trees under experiment with 

 respect to the rest d? the orchard is shown in figure 36. All trees not 

 in the experiment were sprayed by the owners. The treatments given 

 and dates of application are stated in Table XIV. 



Table XIV. — Dates of applications for codling moth and plum curculio, one-spray 

 method. Mount Jackson, Va., 1909. 



Late of application. 



Plat XIII. (Demonstration.) 



Plat XV. (One-spray method.) 



Plat XVII. 

 (Unsprayed.) 



First application, May 

 6-7 (after falling of 

 petals). 



Second application, May 

 28-29. 



Third application, July 

 8-9. 



Not drenched. Vermorel noz- 

 zles. Mist spray. Arsenate 

 of lead, 2 pounds to 50 

 gallons Bordeaux mixture 

 (1-1-50). Pressure 120 to 140 

 pounds. 4.7 gallons per tree. 



Not drenched. Vermorel noz- 

 zles. Mist spray. Arsenate 

 of lead, 2 pounds to 50 

 gallons Bordeaux mixture 

 (2-2-50). 



do 



Drenched with arsenate of 

 lead, 2 pounds to 50 gallons 

 water. Pressure 175 pounds. 

 Seneca nozzles. 8.1 gallons 

 per tree. 



Bordeaux mixture only (2-2- 

 50). Not drenched. 



.do. 



Unsprayed. 



Do. 



Do. 



