﻿STKAWBERRY EOOTWOEM Oif GREENHOUSE ROSES 



19 



Table 9. — Variation in length of the period of incuhation of eggs of the straw- 

 hemj root'worin beetle during 1920 and 1922, Iry months 



1920 



Period of incubation 



Days 



7 



8 



9. 



10 



11 



12 



13 



14.. 



15 



.Average in days... 



Number of eggs liatehed during— 



March 

 and April 



May 



June 



12.89 



9.25 



July 



August 



Total 

 number 



of eggs 

 hatched 



11.33 



1922 



4. 











1 



1 











2 



1 



6 



10 



8 



9 



40 



25 



35 







2 



1 























14 



119 



52 



208 



34 



68 



74 



62 



54 



12 



13 



2 



1 













 

 



158 



174 



389 



393 



160 



115 



4 



64 







































6 



1 



7 



707 



58 



577 



244 



327 



45 



49 



27 



















































99 



245 



166 



137 



56 



17 



6 











































6 





1 



6 



8 



7 



965 



8 



477 



9 



1,146 



10. 



895 



11 



596 



12 



391 



13 . 



103 



14 



167 



15 



83 



16.. 



102 



17 



79 



18 



47 



19 ._._ 



13 



20 



4 



21 



1 



22.. 







23.. 



1 







-Average in days 



15.96 



13.07 



9.62 



8.92 



8.84 



9.89 







Table 10. — Time of deposition and hatching and period of indication of eggs of 

 the strawderry roottvorm beetle in 1921 



Number of eggs— 



Date of 



hatching 



Incuba- 

 tion 

 period 



Days 

 17 

 21 

 27 

 18 

 21 

 17 

 22 

 23 



Date of 

 deposition 



Number of eggs- 



Date of 

 hatching 



Incuba- 



deposition j3gpo3. 

 ited 



Hatched 



Depos- 

 ited 



Hatched 



tion 

 period 



Mar. 22 .52 



30 64 



31 35 



Apr. 2 11 



4 65 



{ 1 



4 



{ 1 

 { I 



Apr. 8.. 

 12.. 

 26.. 

 18.. 

 21.. 

 19.. 

 26.. 

 27.. 



Apr. 6 



6 



19 



21 



21 



33 



19 

 33 



26 

 30 



1 

 1 



2 

 2 



4 



Apr. 26.. 



26.. 



May 9.- 



9.. 



9.. 



Days 

 20 

 20 

 20 



18 



18 



nATCIIINQ 



Observations on the hatching of two larvic, A and B, were as 

 follows: When first observed A was yellowisli in color with a trans- 

 parent head and dark brown mandibles. It had already broken or 

 chevv-ed one end of the shell and had freed its entire abdomen by 



