TWO LEAFHOPPERS INJURIOUS TO APPLE NURSERY STOCK. 



27 



did any third-brood nymphs develop, only winter eggs being depos- 

 ited by the females. 



Table XVII. — Number of winter eggs deposited in baric of apple 

 adults in confinement, West Chester, Pa., 1915. 



by second-brood 



Cage. 



Date of confinement. 



Number 

 of pairs 

 confined. 



Date of examination. 



Number 

 of eggs 

 present. 



1 



1915. 

 Sept. 26 



6 

 5 



1915. 

 Nov. 25 



98 



2 



Oct. 9 



...do 



78 





Total 









176 











16 













Table XVIII. — Number of winter eggs deposited in bark of apple trees by second-brood 

 adults in confinement, West Chester, Pa., 1916. 



Cage. 



Date of confinement. 



Number 

 of pairs 

 confined. 



Date of examination. 



Number 

 of eggs 

 present. 



1 



1916. 



6 

 9 



1916. 



104 



2 



Sept. 6 



Nov. 8 



iae 





Total 









233 











15.5 













In Table XIX the daily temperature is given for the period of seasonal activity, 1916. 



Table XIX. — Daily maximum, minimum, and average temperature taken at West 

 Chester, Pa., from July 21 to Oct. 31, 1916. 





July. 



August. 



September. 



October. 



Day of month. 



Maxi- 

 mum. 



Mini- 

 mum. 



Aver- 

 age. 



Maxi- 

 mum. 



Mini- 

 mum. 



Aver- 

 age. 



Maxi- 

 mum. 



Mini- 

 mum. 



Aver- 

 age. 



Maxi- 

 mum. 



Mini- 

 mum. 



Aver- 

 age. 



1916. 



i ; 



°F. 



°F. 



"F. 



°F. 



85 

 80 

 78 

 88 

 88 

 92 

 91 

 92 

 85 

 82 

 86 

 86 

 74 

 78 

 80 

 80 

 90 

 86 

 90 

 88 

 93 

 92 

 92 

 79 

 84 

 84 

 86 

 70 

 74 

 80 

 82 



°F. 



74 

 70 

 74 

 78 

 77 

 80 

 82 

 75 

 76 

 68 

 78 

 78 

 70 

 72 

 74 

 74 

 80 

 80 

 82 

 82 

 75 

 82 

 82 

 69 

 66 

 75 

 74 

 64 

 64 

 66 

 65 



°F. 

 79.5 

 75 



76 



83 



82.5 



86 



86.5 



83.5 



80.5 



75 



82 



82 



72 



75 



77 



77 



85 



83 



86 



85 



84 



87 



87 



74 



75 



79.5 



80 



67 



69 



73 



73.5 



°F. 



84 

 81 

 72 

 78 

 83 

 84 

 86 

 88 

 76 

 74 

 72 

 76 

 81 

 84 

 72 

 66 

 70 

 68 

 62 

 72 

 72 

 75 

 76 

 68 

 66 

 72 

 79 

 82 

 72 

 59 



"F. 



78 

 76 

 66 

 70 

 72 

 76 

 78 

 74 

 68 

 66 

 60 

 61 

 65 

 72 

 64 

 56 

 62 

 60 

 51 

 57 

 56 

 64 

 68 

 55 

 57 

 57 

 66 

 70 

 56 

 46 



°F. 



81 



78.5 



69 



74 



77.5 



80 



82 



81 



72 



70 



66 



68.5 



73 



78 



68 



61 



66 



64 



56.5 



64.5 



64 



69.5 



72 



61.5 



61.5 



64.5 



72.5 



76 



64 



52.5 



°F. 

 53 

 65 

 70 

 65 

 75 

 73 

 70 

 77 

 82 

 53 

 62 

 70 

 56 

 60 

 60 

 62 

 68 

 58 

 67 

 80 

 57 

 54 

 56 

 61 

 64 

 56 

 58 

 56 

 61 

 67 

 62 



°F. 

 45 

 50 

 53 

 61 

 59 

 65 

 62 

 60 

 70 

 43 

 50 

 58 

 54 

 52 

 45 

 59 

 60 

 44 

 56 

 68 

 49 

 45 

 44 

 48 

 46 

 48 

 49 

 49 

 46 

 50 

 50 



°F. 

 49 



2 









57.5 



3 









61.5 



4 









63 



5 









67 



6 









69 



7 









66 



8 









68.5 



9 









76 



10 









48 



11 









56 



12 









64 



13 









55 



14 









56 



15 









52.5 



16 









60.5 



17 









64 



18 









51 



19 









61.5 



20 









74 



21 



80 

 81 

 84 

 78 

 76 

 82 

 90 

 80 

 80 

 84 

 92 



72 

 70 

 76 

 74 

 74 

 78 

 75 

 74 

 74 

 74 

 85 



76 



75.5 



80 



76 



75 



80 



82.5 



77 



77 



79 



88.5 



53 



22 



49.5 



23 



50 



24 



54.5 



25 



55 



26 



52 



27 



53.5 



28 



52.5 



29 



53.5 



30 



58.5 



31 



56 













