x 
26 BULLETIN 1357, U. S. DEPARTMENT OF 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 ot indefinite duration, and 
are more likely to occur in the intervals between broods, especially 
in May and June, and again in August and early September. 
Eges have not been found in greenhouses between September 1 
and March 1. Soil examinations in September and October have 
shown only well-developed larve and pup; never any young larve. 
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 se aaa aiter February, even though 
a few were laid during December and January, owing possibly to 
cage conditions. 
TABLE 12.—Period of egg deposition of strawberry rootworm beetles collected 
from September, 1921, to January, 1922 
[Eggs were deposited by caged beetles from December, 1921, to March, 1922, although none were found in. 
greenhouses in the same period] 
| | 
| A B @ D E F 
_ 10 beetles 17 beetles | 13 beetles 15 beetles 2beetles | 9 beetles 
Date | abe e 
| ; 
| Alive | Eggs} Alive | Eggs; Alive | Eggs} Alive | Eggs} Alive.| Eggs | Alive | Eggs: 
1921 
AUUIOAR eee ome NE 140 CD es a a habs el Pe een meee a pie Be ts 3S SS ee SSuAR ot aie 
Sent hoes ree ay tes: 10 CU) | ee | oa oe ae ie ee 145 0: 2 sy aae Se ee SE aie iS 
SS eehces nes thea 10 0 Tele Py OMe ho ee eat 15 0. |:2 2S: Ao eee | Saree 
OeG rr tae Ps 10 0 ie omens | rR Ty ae 15 Ogee arate Stee Sadi aed pre a 
1 eS oe eR 9 0 fe) 0 | 11 0 14 0.) 5° Von POG ee ee 
INOVen O22 25. 2 sale 6 0 Ui 0 9 | 0 14 0 1 | (al ee eS 
pts ea a ae! 6 0! ae O 9 0 8 0 LS. Oa eee 3 
SB a Ra NIE OME SB 5 0 i 0 9 0 5 0 1 es pene al es ee el 2 ea 
Deeg oe ao ee BF 0 4 1 9 0 5 0 1 0: 249 
(uae ae DIRE S | bys eee 4 2 9 0 5 0 1 ig Meas C23 8 i 
beter ee a be 0 4 0 | 9 0 | 3 0 1 15 ere eos Be a 
Do He Ue SL Bs dann 0 a aaah 9 0 3 07 OP OCROH EES Tae = 
aE NA | ANS 9 (Oh era a 73 9 0 3 0) 1k ¢ S0s aeecee ehe = 
I fib Sr conc eae 4 0 4s 10 9 0 3 6 | 1 05 |42 ee ee 
Quatre s Cateb Tees | 4 0 Bile oi8 9 4 3 0 1 ie Dorcas Sr x 
BO ze ee te ee ec eal gO 25 Pee) 9 2 alee 1°] 50 eee 
Se Sas Pra | 4 0 | ey Bea) 8 0 | 3 0 boyy Oe = 
| | | | | | 
1922 | | 
Jan Sak BEE re A 3 | 0 om 0 vA 3 | 3 10 | 1 0 1g | 0 
Deen ee eee emo Ore eo ee 6 Orin 0 Lie SOR oe mes 0 
Bene 7 ee YS | PRA Ne Ca) 3 0 4 2 3 0 ie gees 7 0 
SOS ES ieee hs: 231 ya 3 7 4 0 | 3 0 | 1 07 7 | 0 
iad Sa De hO 3 0 4 07 3 4 1 6. 6 | 6 
DRE eae Mepres Pare: 3 11 25 0 | ha 0 | 1 $4 6 |! 17 
Mar Gs ee ee ce 2a) 3 11 he pie oi | pay ices ial See Sad 6 5 
Seas 7o 2 eta Lyne | eee! Pina Diy rm kOe | 1 O- 5 15 
Tease CL Angi, Toh) ees 2 9 TRI ae ee) alae 5 | 0 
5 ee ee ee 20 |} 0 2 18 2 | 0 | 2 0 | 1S eS Bit 50 
BIDE Serb eee he RS AS Fs 9 SH 1 0 Dil - Is Oat as2s0 0 1 07 3 4 
CA die Ree Sale ale: Syd eos 1 0 Mads Bt | el fan 1 07 Oo eee 
rips ao ceepe saps 9 Rais Pea Ee a 1 0 DS i Oypecenes:|\. 2 Fess 1 0 2} 19 
7 A Tae ys 2a eee see eas BA 1 0 2 | i Sena egies i 0 2 15 
Fo ee 9 a ee isi RES 20 0 |. 2 GREE PETE Ser 32 eas as 2 | 0 
IN Tayi G bee ea ee Shales See ee ee 2} Oglest ae eee 1! 0 2 0 
ee A aT tat 52] ie ee Pee eee 2 | a pecet ee eeege a a Ry Boi! S| 2 0 
“ieee dace eee LS «2. [22e8e oes ee ie So i eR 22s es. Sees i}. 254s 2a 0 
FTN ak CARS AY MEO ee PES ihe Sead PB. (1 (ee | See ae Tie ree lhl oe Dy ee 
TUTE ier s ee ORD GRE Milo at Tee ae PANS Gres | 20 | Oates eS pees 1 SUL Bat eth rete 
ey, weenie Bee k cou) oes oat aeteeee ae ee aoe ee See 20 i enced 
Wotalecee sya Pewee fy Bis Ree, Uae 1 cf | eb ae 32 |isieut (1 D4 | oe Re eee ene 
i Date collected. 2 Cage closed. 
