64 



Table XVI. — Activity of five iveevils in different parts of the day. 



Date. 



Period. 



Tem- 

 pera- 

 ture. 



t 



02 © 



o o 



V 



bD 



<D 



a_, 33 



. pi 

 gft 



be 



.a 



0> 33 



o> © 

 53 « 



Condition of 

 weevil at end 

 of period. 



Remarks. 



1903. 



Sept. 2 



Sept. 2-3. .. 



Sept. 3 



Do 



Do 



2.30to6p.m 



6p.m. to6 a.m 



6.15 to 10.15 a. m 



10.40 a.m. to 2.40p.m. 

 3 to 6.30 p. m ._ 



93-80 



80-69 



69-85 



85-95 

 95-84 



84-68 



68-83 



83-91 



91-82 

 82-79 



16 



3 



12 



18 

 12 



3 



4 



24 



11 



5 



15 



1 



10 



15 

 11 



1 



1 



19 

 8 

 



10 



2 



2 



10 

 6 



3 



4 



12 

 5 



Placed on fresh 



plant. 

 All resting 



All active 



do 



Placed on fresh 



plant. 

 All resting 



3 moving to ad- 

 jacent squares. 

 All active 



Punctures black 



at 6 a.m. 

 3 trying to escape; 



cage moved. 

 Cage moved. 



Sept. 3-4 ... 



Sept. 4 



Do 



Do 



6.30 p.m. to 6 a.m 



6.30 to 10 a.m _'_..,_„ 



10 a. m. to 4 p. m 



4 to 6p.m 



6 p.m. to 9 a.m 



Total 



Feeding punc- 

 tures all black; 

 small square 

 flared. 



Sept. 4-5... 



All feeding 



C 1 o xi d y ; every 

 weevil on same 

 square as at 6 

 p.m. 





108 



81 



60 













An examination of these figures shows that weevil activity began 

 and ceased at about 75° F. Activity increased as the temperature 

 rose, and its maximum coincided with the maximum of daily tern- 



FAHREN- 

 HEIT 



TIME 



I2p Iam 2 3 4 5 6 7 8 9 10 II I2m Ipm 2 3 4 5 6 7 8 9 10 II 12 p 



100° 

 95° 

 90° 



85° 

 80° 

 75° 

 70° 

 65° 

 60° 



















































































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V U 



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ci<3 



4 



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Fig. 3.— Diagram showing average activity of five female weevils. (Original.) 



perature. It then decreased with the falling temperature until it 

 ceased entirely some time during the evening, probably at about 

 75° F. See fig. 3. Feeding continued at lower temperatures than 

 oviposition, as is known to be the case during the late fall. 



Examinations made in the field between 6 and 7 a. m. on Septem- 

 ber 4 showed that all weevils, both males and females, were quietly 

 resting at that time with the temperature at about 70° F. On cloudy 

 days the activity is less than it is on clear days. 



