﻿STEAWBERRY ROOTWQE.M ON GREENHOUSE ROSES 



15 



found almost continuously until August, at which time they were 

 less numerous, and none have been collected in greenhouses after 

 August 31 in any year. These records are very similar to obser- 

 vations on caged beetles, as indicated in Table 6. 



Table 5. — Total nmriber of eggs la/id hy caged strawterry rootworm beetles, 



1922 





Number of— 



Date of deposition 



Number of— 



Date of deposition 



Eggs 



Adults 



Eggs per 

 adult 



Eggs 



Adults 



Eggs per 

 adult 



Mar. 27 



12 

 17 

 67 

 28 

 34 

 149 

 168 

 68 

 33 

 21 

 22 

 92 

 39 

 35 

 147 

 76 

 142 

 153 

 112 

 62 

 76 

 160 

 148 

 122 

 221 

 181 

 176 

 246 

 303 

 178 

 468 

 12 

 157 

 105 



59 

 90 

 107 

 115 

 115 

 115 

 111 

 111 

 76 

 52 

 52 

 50 

 50 

 50 

 50 

 48 

 47 

 46 

 44 

 44 

 43 

 42 

 64 

 66 

 65 

 59 

 54 

 56 

 55 

 65 

 64 

 64 

 62 

 66 



0.20 

 .19 

 .63 

 .24 

 .30 

 1.30 

 1.51 

 .61 

 .43 

 .40 

 .42 

 1.84 

 .78 

 .70 

 2.94 

 1.58 

 3.02 

 3.33 

 2.55 

 1.41 

 1.77 

 3.81 

 2.31 

 1.85 

 3.40 

 3.07 

 3.26 

 4.39 

 5.51 

 2.74 

 7.31 

 .19 

 2.53 

 1.69 



June 21 .- 



20 



57 

 105 

 221 



27 

 101 



13 

 434 

 251 

 243 

 352 

 206 



53 

 532 



56 

 322 

 621 

 636 

 561 

 622 

 378 

 176 

 101 

 296 

 583 

 182 

 265 

 159 

 125 

 124 

 116 



34 



124 

 123 

 121 

 117 

 116 

 109 

 109 

 102 

 98 

 95 

 147 

 131 

 127 

 127 

 118 

 117 

 114 

 114 

 134 

 131 

 131 

 129 

 128 

 128 

 128 

 127 

 123 

 120 

 118 

 114 

 93 

 46 



0.16 



29 



22 



.46 



Apr. 3 



23 



87 



6 . 



26. 



1 89 



8 



28. - . 



.23 



10 



29. 



93 



13 . 



30 



.12 



15 - 



July 1 



4 25 



17. . - 



3 



2 56 



19 



5 



2.56 



21 



8 



2.39 



34. 



10 



1 57 



26 



12. 



.42 



28 



14. 



4.19 



May 3 



15 



47 



6 



18 . 



22. 



2.75 



8 



5.45 



11 



25 



5.58 



15 



28 



4.19 



17 



31 



4.75 



20 



Aug. 1 



2.89 



22 



2... 



1.36 



24.. 



3. . - 



.79 



26 



5 



2.31 



29 



7 



4.55 



31.. 



9 



1.43 



June 3 



11 



2.15 



5 



14 



1.33 



7 



17. 



1.06 



9 



21 



1.09 



13 



29 



1.25 





Sept. 21. 



.74 





Total 





19 



12,002 



6,016 



2.00 









Figure 6 shows the results of observations on 60 caged adults 

 made every 2 hours over a period of 80 hours, during which 490 

 eggs were laid, and is based on data contained in Table 6. Accord- 

 ing to these records, the time of day most favored by the female for 

 egg deposition is the late afternoon, and next to that the early 

 morning hours. 



Table 6. — Egg deposition by adults of the strawberry rootworm; observations 

 upon which graph of Figure 6 is based 





Dateofoviposition 



Number of eggs laid— 







p.m. 



a. m. 



m. 



p.m. 



Total 

 number 

 of eggs 





12 



(0 

 

 7 

 4 



2 



4 



6 



8 



10 



12 



2 



4 



6 



8 



10 





July 11 













O 

 

 

 



15 

 18 



'47" 

 92 

 23 



126 



7 



17 



24 





 1 

 

 



126 



12 





 

 





 22 

 



1 



4 

 33 



6 

 12 

 9 



6 

 

 





 

 



84 



13 



169 



14 



111 







> No data. 



> Observation started. 



