128 



DECIDUOUS FRUIT INSECTS AND INSECTICIDES. 



curculio, as on this latter the 'beetles were quite abundant, as shown 

 by the low total percentage of uninjured fruit, namely, 8.85 per cent. 

 In view of the habits of the curculio in ovipositing and feeding over 

 a considerable period (six to eight weeks or more), the results from 

 the one-spray method are the more surprising, and it would appear 

 that the single treatment resulted in their almost complete destruction. 

 In Table VIII are brought together data showing the effects of the 

 treatments in the control of the three principal insect enemies of the 

 fruit, namely, the codling moth, the plum curculio, and the lesser 

 apple worm (Enarmonia prunivora Walsh). The value of the one- 

 spray method is here put to the severest possible test so far as con- 

 trolling insect enemies of the fruit is concerned. It will be noted 

 that when these three insects are taken into account somewhat better 

 results were secured from Plat IV, which received the demonstration 

 treatment, namely, 81.19 per cent sound fruit, as against 79.60 per 

 cent sound fruit from the one-spray plat. The ynsprayed plat (V) 

 shows a very low percentage of fruit free from injury by these three 

 insects, namely 6.94 per cent. 



Table VIII. — Effect of treatments on the three principal fruit insects and total percentage 

 of sound fruit. Siloam Springs, Ark., 1909. 



PLAT I. ONE-SPRAY. 



Injured by plum curculio 



Injured by codling moth 



Injured by lesser apple worm 



Number injured apples 



Number uninjured apples 



Total number apples 



Tree 1. 



Tree 2. 



Tree 3. 



Tree 4. 



Tree 5. 



Tree 6. 



Tree 7. 



1,179 



915 



687 



387 



208 



532 



370 



703 



522 



419 



118 



181 



222 



286 



71 



74 



41 



6 



31 



17 



19 



1,778 



1,403 



1,062 



486 



409 



739 



652 



3,911 



3,410 



2,734 



2,264 



3,037 



3,023 



2,655 



5,689 



4,813 



3,796 



2,750 



3,446 



3,762 



3,307 



Tree 8. 



706 

 315 



30 



991 



4,452 



5,443 





Tree 

 9. 



Tree 



10. 



Tree 

 11. 



Tree 

 12. 



Tree 

 13. 



Total 

 for 

 plat. 



Per cent 

 free from 

 injury. 



Total 



per cent 



free 



from 



injury. 





364 



110 



10 



473 



3,126 



3,599 



216 



113 



5 



349 



2,303 

 2,652 



335 



131 



5 



460 



3,433 



3,895 







5,899 



3,120 



309 



8,802 



34,348 



43, 152 



86.34 

 92.74 

 99.29 













Injured by lesser apple worm 























79.60 























PLAT III. ONE-SPRAY. 



Injured by plum curculio 



Injured by codling moth 



Injured by lesser apple worm 



Number injured apples 



Number uninjured apples 



Total number apples 



Tree 1. 



Tree 2. 



Tree 3. 



1,051 



349 



533 



397 



298 



286 



29 



19 



14 



1,363 



525 



772 



3,386 



2,960 



1,972 



4,749 



3,485 



2,744 



Tree 4. 



Tree 5. 



Tree 6. 



Tree 7. 



368 



358 



795 





431 



321 



247 



231 



32 



40 



22 



26 



806 



684 



1,010 



919 



1,846 



1,557 



2,560 



1,962 



2,652 



2,241 



3,570 



2,881 



372 



200 



12 



551 



1,441 



1,992 



