TWO T.EAFTTOPPICP.R TN.TITRIOTTS TO APPLE NTTKSERY STOCK. 



13 



Table IV. — Length of nymphal stag-es of the first brood oj the apple leaf hopper at Wtst 



Chester, Pa., 1915. 



First brood, June and July. 



Date 

 of 



hatch- 

 ing. 



Pir.st 

 molt. 



First 

 stage. 



Second 

 molt. 



Sec- 

 ond 

 stage. 



Tliird 

 molt. 



Third 

 stage. 



Fourth 

 molt. 



Fourth 

 stage. 



Fifth 

 molt. 



Fifth 

 stage. 



Total 

 nym- 

 phal 

 pe- 

 riod. 



Aver- 

 age 

 mean 

 tem- 

 pera- 

 ture 

 for 

 nym- 

 phal 

 pe- 

 riod. 



1915. 

 June 12 



Do... 



Do... 



Do... 

 June 13 



Do... 



Do... 



Do... 



Do... 

 June 14 



Do... 



Do... 



Do... 



Do... 

 June 15 



Do... 



Do... 



Do... 

 June 18 



Do... 

 June 19 

 June 23 



1915. 

 Juno 15 

 June 16 

 Juno 18 

 Juno 10 

 ...do.... 

 June 17 

 Jiuie 18 

 Juno 16 

 Juno 18 

 June 16 

 June 17 

 Juno 18 

 ...do.... 

 June 17 

 June 18 

 ...do.... 

 Juno 19 

 ...do.... 

 Juno 21 

 Juno 20 

 June 21 

 June 26 



- -• 



Days. 

 3 

 4 

 6 

 4 

 3 

 4 

 5 

 3 

 5 

 2 

 3 

 4 

 4 

 3 

 3 

 3 

 4 

 4 

 3 

 2 

 2 

 3 



1915. 

 Juno 17 

 Juno 18 

 June 21 

 Juno 19 

 June 20 



...do 



...do 



...do 



...do 



June 19 

 June 20 



...do 



Juno 21 



...do 



...do 



...do 



...do 



Juno 22 

 June 26 

 June 24 



...do 



June 30 



Days. 

 2 

 2 

 3 

 3 

 4 

 3 

 2 

 4 

 2 

 3 

 3 

 2 

 3 

 4 

 3 

 3 

 2 

 3 

 5 

 4 

 3 

 4 



1915. 

 Juno 21 

 ...do.... 

 June 25 

 June 22 

 Juno 24 

 June 21 



...do 



June 25 

 June 23 

 June 21 

 June 24 

 June 23 

 June 29 

 June 23 

 June 24 

 June 25 

 Juno 24 

 June 27 

 June 29 



...do 



June 26 

 July 4 



Days. 

 4 

 3 

 4 

 3 

 4 

 1 

 1 

 5 

 3 

 2 

 4 

 3 

 8 

 2 

 3 

 4 

 3 

 5 

 3 

 5 

 2 

 4 



1915. 

 June 25 

 June 26 

 June 29 

 June 27 



...do 



Juno 26 

 June 27 

 June 29 

 June 27 

 June 29 

 June 28 



...do 



July 2 

 June 26 

 June 28 

 June 29 

 June 28 

 July 1 

 July 3 

 July 2 

 June 29 

 July 8 



Days. 

 4 

 5 

 4 

 5 

 3 

 5 

 6 

 4 

 4 

 8 

 4 



t 



3 



4 

 4 

 4 

 4 

 4 

 3 

 3 

 4 



1915. 

 June 30 

 July 1 

 July 3 

 July 1 

 July 2 

 July 1 

 July 4 

 July 3 

 July 2 

 July 3 

 July 2 

 July 3 

 July 6 

 July 1 

 July 3 

 July 4 

 July 1 

 July 6 

 ...do.... 

 ...do... 

 July 4 

 July 11 



Days. 

 5 

 5 

 4 

 4 

 5 

 5 

 7 

 4 

 5 

 4 

 4 

 5 

 4 

 5 

 5 

 5 

 3 

 5 

 3 

 4 

 5 

 3 



Days. 

 18 

 19 

 21 

 19 

 19 

 18 

 21 

 20 

 19 

 19 

 18 

 19 

 22 

 17 

 18 

 19 

 16 

 21 

 18 

 18 

 15 

 18 



"F. 



75. 18 

 75.47 

 75.79 

 75.47 

 75.20 

 75.15 

 75.70 

 75.52 

 75.20 

 75.20 

 74.84 

 75.20 

 75.28 

 74.77 

 74.81 

 75.05 

 74.32 

 74.95 

 74.36 

 74.36 

 74.06 

 75.07 



Average 



3.5 



3 



3.4 



4.2 



4.5 



18.7 



75.04 















FIRST BROOD OF ADULTS. 



Longevity. — ^First-brood adults were confined in a Riley cage to 

 determine the length of life. Most of the hoppers died by August 1, 

 as shown in Table V. 



Table V. — Longevity of first-brood adult apple leafhoppers; 50 adults placed in cage 



July 2, 1915. 



Date of examination. 



July?. 

 July 8. 

 July 9. 

 July 10, 

 Do 

 July 11. 

 July 12. 

 July 13, 

 July 17. 

 July 24. 



Number 

 dead. 



Date of examination. 



July 24. 

 July 26. 

 July 27. 

 July 30. 

 July 31. 

 Aug. 2. 

 Aug. 4. 

 Aug. 5 . 

 Do. 

 Aug. 6 . 



Number 

 dead. 



1 2 

 2 

 3 

 4 

 1 

 3 

 2 

 1 

 1 

 1 



1 Escaped. 



Extent of reproduction. — Two globe cage experiments were made to 

 determine the extent of reproduction by a first-brood female in con- 

 finement. In one cage two pairs of adults, in the other three pairs 

 were confined until death occurred. The average number of eggs 



