142 



DECIDUOUS FRUIT INSECTS AND INSECTICIDES. 



Table XXI. — Places of entrance of fruit by total larvsefor each tree of each plat. Sauga* 

 tuck, Mich., 1909 — Continued. 



PLAT III. ONE SPRAY. 





Number of larvae for each tree. 



Brood and place of entrance. 



Tree 

 224. 



Tree 

 225. 



Tree 

 232. 



Tree 

 236. 



Tree 

 237. 



Tree 

 238. 



Tree 

 239. 



Tree 

 244. 



First brood: 



Calyx 



5 



86 

 2 



3 

 6 

 1 



is' 



2 



24 



1 



7* 



2 

 5 



1 

 2 



3 



Side 



31 



Stem 















Total 



93 



10 



15 



27 



7 



7 



3 



34 







Second brood: 



Calyx 



4 



356 

 9 



1 

 141 



6 

 416 



4 



370 



4 



1 

 161 



1 

 43 



1 

 75 



4 



Side 



492 



Stem 



2 

















Total 



369 



142 



422 



378 



162 



44 



76 



498 









Number of larvae for each tree. 



Per- 

 centage 

 of larvae 

 enter- 

 ing. 



Total 

 larvae of 



Brood and place of entrance. 



Tree 

 245. 



Tree 

 246. 



Tree 

 249. 



Tree 

 252. 



Tree 

 266. 



Total 

 for 

 plat. 



first 



and 

 second 

 broods. 



First brood: 



Calyx 



2 



40 



1 



13 

 2 



1 



6 







20 



245 



6 



7.38 

 90.41 

 2.21 





Side 



1 



9 





Stem 

















Total 



42 



16 



7 



1 



9 



271 













Second brood: 



Calyx 



9 



297 



13 



i76" 



4 



4 



67 



"""52" 



2 

 131 



1 



37 



2,777 

 33 



1.30 



97.54 



1.16 





Side 





Stem 













Total 



319 



180 



71 



52 



134 



2,847 





3,118 







A study of the percentages of larvae of the respective broods enter- 

 ing the calyx, side, and stem ends of the fruit for each plat, as shown 

 in Table XXI/ presents some points of interest. On all plats a 

 greater percentage of larva? of the first brood entered at the calyx 

 than was true of larvae of the second brood. Thus, on the un- 

 sprayed plat (I), 85.20 per cent of the first-brood larvae entered at 

 calyx as against 50.45 per cent of second-brood larvae. On Plat II 

 (demonstration) 20.95 per cent of first-brood larvae entered at calyx 

 end as compared with 0.52 per cent of second-brood larvae, while on 

 Plat III (one spray) 7.38 per cent of first-brood larvae entered at calyx 

 and 1.30 per cent of second-brood larvae entered at this place. 



Attention should also be called to the ratio of increase of larvae 

 between the first and second broods. On Plat I (unsprayed) for 

 every larva of the first brood there were 1.82 second-brood larvae, 

 whereas on Plat II (demonstration) and Plat III (one spray) for each 

 larva of the first brood there were 7.7 and 10.5, respectively, of the 

 second brood. 



