56 



DECIDUOUS FKUIT INSECTS AND INSECTICIDES. 



Table XXIII. — Progress of infestation of fruit by larvse of the grape-berry moth in 

 experimental plats. Vineyard of Mr. W. S. Wheeler, North East, Pa., 1907. 



FIRST COUNT OF INFESTED BERRIES MADE JULY 24. 



Plat 

 No. 



Date of spray 

 application." 



Num- 

 ber of 

 appli- 

 cations. 



Spray formula. 



Num- 

 ber of 

 vines 

 exam- 

 ined. 



Total 

 number 

 of clus- 

 ters. 



Aver- 

 age 

 number 

 of ber- 

 ries per 

 cluster. 



Num- 

 ber of 

 infested 

 berries. 



Total 

 number 

 of ber- 

 ries 

 count- 

 ed. 



Per- 

 centage 

 of ber- 

 ries in- 

 fested. 



I. 



June 19, July 8, 27. 



3 

 3 

 3 

 3 



. 2 



None. 



2 



5-5-3-50 



25 

 25 

 25 

 25 

 25 

 25 

 25 



997 

 853 

 842 

 835 

 744 

 890 

 1,204 



36 

 36 

 36 

 36 

 36 

 36 

 36 



205 

 83 

 113 

 131 

 172 

 317 

 126 



35,892 

 30,708 

 30,312 

 30, 060 

 26,784 

 32,040 

 43,344 



0.45 



II. 



5-5-3-2-50 



.27 



III. 

 IV. 



do 



July 9, 27 



5-6-1 qt.-2-50 



5-6-1 qt.-50 



5-6-1 qt.-2-50 



None 



.37 

 .43 



V. 

 VI. 



do 



Unsprayed 



July 9, 27 



.64 

 .98 



VII. 



5-5-3-2-50 



.29 











SECOND COUNT OF INFESTED BERRIES MADE AUG. 29. 



I. 

 II. 

 III. 

 IV. 

 V. 

 VI. 

 VII. 



June 19, July 8, 27 



do 



do 



do 



July 9, 27 



Unsprayed 



July 9, 27 



3 

 3 

 2 

 None. 

 2 



5-5-3-50 



5-5-3-2-50 



5-6-1 .qt.-2-50 

 5-6-1 qt.-50. . 

 5-6-1 qt.-2-50 



None. 



5-5-3-2-50. . . . 



25 



997 



36 



662 



35,892 



25 



853 



36 



337 



30,708 



25 



842 



36 



432 



30,312 



25 



835 



36 



330 



30, 060 



25 



744 



36 



419 



26,784 



25 



. 890 



36 



696 



32,040 



25 



1,204 



36 



340 



43,344 



1.84 

 1.09 

 1.09 

 1.09 

 1.56 

 2.17 

 .78 



THIRD COUNT OF INFESTED BERRIES MADE OCT. 9. 



II. 

 III. 

 IV. 



V. 



VI. 



VII. 



June 19, July 8, 27 



....do 



....do 



do 



July 9, 27 



Unspraved 



July 9, 27 



3 

 3 

 3 

 3 

 2 

 None. 



5-5-3-50 



5-5-3-2-50. . . . 

 5-6-1 qt.-2-50 

 5-6-1 qt.-50.. 

 5-6-1 qt.-2-50 



None 



5-5-3-2-50. . . . 



25 



997 



36 



2,326 



35, 892 



25 



853 



36 



1,751 



30, 708 



25 



842 



36 



1,503 



30,312 



25 



835 



36 



1,083 



30, 060 



25 



744 



36 



1,681 



26,784 



25 



890 



36 



3,549 



32,040 



25 



1,204 



36 



1,910 



43,344 



6.45 

 5.70 

 4.95 

 3.60 

 6.27 

 11.07 

 4.40 



FOURTH COUNT OF INFESTED BERRIES MADE OCT. 23. 



I. 

 II. 

 III. 

 IV. 

 V. 

 VI. 

 VII. 



June 19, July 8, 27. 



do 



do 



do 



July 9, 27 



Unspraved 



July 9, 27 



3 

 3 

 3 



2 



None. 



2 



5-5-3-50 



5-5-3-2-50. . . . 

 5-6-1 qt.-2-50 

 5-6-1 qt. -50.. 

 5-6-1 qt.-2-50 



None 



5-5-3-2-50. . . . 



25 



997 



36 



4,655 



27, 544 



25 



853 



36 



2,295 



25, 668 



25 



842 



36 



2,648 



24, 552 



25 



835 



36 



2,295 



24,232 



25 



744 



36 



2,288 



23, 562 



25 



890 



36 



3,149 



23,000 



25 



1,204 



36 



2,338 



36, 980 



16.90 

 9.51 



10.78 

 9.74 

 9.71 



13.69 



In making these counts it was observed that the infestation was 

 very irregular throughout this block of vineyard. The first two or 

 three rows on Plat I were heavily infested. The fruit on about 20 to 

 30 vines, on the east end of plats I, II, and III was also quite badly 

 infested. Passing through Plats V, VI, and VII and toward the 

 north side and the west end of the vineyard the infestation was much 

 lighter, and on Plat VII and the extreme west end of Plats IV, V, VI, 

 and VII the infestation was very light. This exceedingly variable 

 condition of infestation has made the tabulation of results very 

 difficult, and it has been quite impossible to bring out the relative 

 value of the different poisons used and the value of the varying 

 number of applications. 



