﻿26 



BULLETIN 1357, U. S. DEPARTMENT OP AGRICULTURE 



10 one grower believed he had rid his plants of the insects because 

 he found only a few beetles and very little evidence of fresh feeding. 

 Ten days later, however, large numbers of soft, light-colored adults, 

 indicating recent emergence, were on the plants feeding voraciously. 

 Such periods of comparative scarcity are of indefinite duration, and 

 are more likely to occur in the intervals between broods, especially 

 in Maj^ and June, and again in August and early September. 



Eggs have not been found in greenhouses between September 1 

 and March 1. Soil examinations in September and October have 

 shown only well-developed larvae and pupse; never any young larvse. 

 That the adults which emerge in the fall do not lay eggs until after 

 •the hibernating period is indicated in Table 12. It will also be seen 

 that most of the eggs were deposited after February, even though 

 a few were laid during December and January, owing possibly to 

 cajre conditions. 



Table 12. — Period of egg deposition of straiolyerry rootivorm beetles collected 

 from September, 1921, to January, 1922 



[Eggs were deposited by caged beetles from December, 1921, to March, 1922, although none were found im 



greenhouses in the same period] 



Date 



A 

 10 beetles 



B 



17 beetles 



c 



13 beetles 



D 



15 beetles 



E 

 2 beetles 



F 

 9 beetles 





Alive 



Eggs 



Alive 



Eggs 



Alive 



Eggs 



Alive 



Eggs 



Alive 



Eggs 



Alive 



Eggs 



1921 

 Aug. 31 



1 10 

 10 

 10 

 10 

 9 

 6 

 6 

 5 

 5 

 5 

 5 

 4 

 4 

 4 

 4 

 4 

 4 



3 



2 

 2 

 2 

 2 

 2 

 2 

 1 

 1 



20 





 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 





 

 

 

 

 

 

 

 3 

 























Sept 12 











1 15 

 15 

 15 

 14 

 14 

 8 

 5 

 5 

 5 

 3 

 3 

 3 

 3 

 3 

 3 

 3 



3 

 3 

 3 

 3 

 3 

 3 

 2 

 2 

 2 

 2 



20 





 

 

 

 

 

 

 

 

 

 

 

 6 

 



t 



10 

 

 

 



t 





 

 

 

 







1 



15 



1 17 

 17 

 9 

 7 

 7 

 7 

 4 

 4 

 4 

 4 

 4 

 4 

 3 

 3 



























1 



2 







1 



27 



10 



10 















..1 



Oct. 12 



113 

 11 

 9 

 9 

 9 

 9 

 9 

 9 

 9 

 9 

 9 

 9 

 9 

 8 



7 

 6 

 4 

 4 

 4 

 2 

 2 

 2 

 2 

 2 

 2 

 2 

 2 

 2 

 2 

 2 

 2 

 1 

 1 



20 



I 

 

 

 

 

 

 

 

 

 

 4 

 2 

 



3 

 

 2 

 

 

 

 1 

 

 

 

 

 

 

 4 

 

 

 5 

 11 

 

 











27 



1 2 

 1 



20 



6 

 

 

 

 

 

 

 

 

 

 

 

 





 

 

 

 6 

 8 

 7 

 



14 

 2 

 

 

 

 

 

 

 



25 

 

 3 

 







Nov. 10- 







17 - 







23 







Dec. 5 







6 







13 - 



1 



22 



j 



24 



j 



27- 



1 



29 





30 





31 



3 





1922 

 Jan. 3--- 



3 

 3 

 3 

 3 

 3 

 3 

 3 

 2 

 2 

 2 

 1 

 1 

 1 

 1 

 ■ 





 2 

 





 11 

 11 

 4 

 9 

 18 

 

 

 

 



n 



19 ; 



5 



Feb. 7 



9 

 7 



13 -- 



7 



6 

 6 







21- 



6 



28-- . - 



17 



Mar 6 -- 



6 ' 5 



13 



5 ! 15 



18 



5 ' 



25--- - - - 



5 ! 50 



Apr. ]- 



3 ! 4 



8 







2 ! 26 



15 











2 ! 19 



24 











2 i 15 



29 











2 1 



May 6-- - 













2 j 



13 







[ 







2 1 



20 













-'0 i 



27 







j 









June 3 1 





1 









10 J 





1 



















1 







Total 





3 



1 113 





32 --.-.- 



24 



- — — 



65 



----_-. ^ 157 















1 Date collected. 



2 Cage closed. 



