100 



DECIDUOUS FRUIT INSECTS AND INSECTICIDES. 



THE CODLING MOTH. 



In Table XI are shown results of treatments on Plats II and VII 

 as compared with Plat VIII (the unsprayed plat) as to injury from 

 the codling moth. 



Table XI. — Number of sound and wormy apples from each tree from demonstration, 

 one-spray, and unsprayed plats. Camden, Del., 1911. 



PLAT II. LIME-SULPHUR DEMONSTRATION. 



Condition of fruit. 



Tree 1. 



Tree 2. 



Tree 3. 



Tree 4. 



Tree 5. 



Tree 6. 



Total 

 for 

 plat. 



Total 

 per cent 



of 

 sound 

 fruit. 





27 

 3,655 



42 

 2,365 



35 

 3,737 



11 

 2,693 



26 

 4,751 



6 

 2,720 



147 

 19,921 





Sound 



■" W" 









Total 



3,682 

 99.26 



2,407 

 98.25 



3,772 

 99.07 



2,704 

 99.59 



4,777 

 99.45 



2,726 

 99.77 



20,068 







99.27 







PLAT VII. ONE-SPRAY METHOD. 



Wormy. 

 Sound". . 



Total 



Per cent sound. 



237 

 2,327 



2,564 

 90.75 



210 



1,884 



2,094 

 89.97 



121 



2,817 

 95.70 



284 

 4,240 



4,524 

 93.72 



187 



2,906 



3,093 

 93.95 



264 



3,092 

 91.46 



1,303 

 16,881 



92.83 



PLAT VIII. UNSPRAYED. 



Wormy . 

 Sound . . 



Total 



Per cent sound. 



2,064 

 1,404 



3,468 

 40.48 



2,427 

 2,471 



4, SOS 

 50.44 



1,509 

 1,712 



3,221 

 53.15 



1,761 

 962 



2,723 

 35.32 



2,465 

 1,678 



4,143 

 40.50 



2,361 

 34.13 



11,781 

 9,033 



20,814 



43.40 



The total percentage of fruit free from codling-moth injury on the 

 demonstration plat was 99.27, the range in percentage for individual 

 trees being from 98.25 to 99.77. On the one-spray plat the total 

 percentage free from this insect was 92.83, the range in percentage 

 for the individual trees being from 89.97 to 95.70. The unsprayed 

 plat shows only 43.40 per cent free from codling moth, with a range 

 in percentage for individual trees of from 34.13 to 53.15. The 

 demonstration plat shows an increase of sound fruit over the one- 

 spray method of 6.44 per cent and over the unsprayed plat of 55.87 

 per cent. The one-spray plat shows an increase of sound fruit over 

 the unsprayed plat of 49.43 per cent. The number of apples counted 

 on the respective plats were 20,068, 18,184, and 20,814, giving a 

 total of 59,066 for the three plats. By referring to the diagram of 

 the orchard (fig. 25) it will be noted that the one-spray plat adjoined 

 the unsprayed plat on the southwest side, which would tend to 

 lower the efficiency of the spray owing to the migration of the moths 

 from the unsprayed plat during the season. 



Table XII gives the places of entrance of the fruit for each tree of 

 each plat for the total larvae of the two broods throughout the season. 



