10 BULLETIN 1357, U. S. DEPARTMENT OF AGRICULTURE 
‘ 
inches long closed with a cork. A piece of cloth placed under the 
cork before the latter was pushed down into the vial was found 
advantageous in preventing the beetles from laying eggs in the crev- 
ices of the cork and also in absorbing any moisture of condensation 
which might otherwise drip down the sides of the vial. 
LONGEVITY 
It was not possible to reduce to an arithmetical basis the longevity 
of the adults in the greenhouses, because the time from emergence to 
date of collection could not be determined. Beetles under observa- 
tion lived as long as 234 days after date of collection. 
It seems probable that under favorable greenhouse conditions the 
adults which emerge during the spring and summer months may live 
from 75 to 100 days, whereas those which emerge later in the season 
and pass the winter in the semidormant condition may remain alive 
for a longer period. Table 2 indicates an average longevity of 52 
days for reared specimens in confinement, although one individual 
lived 364 days. : 
TABLE 2.—Longevity of 45 strawberry rootworm beetles reared from pupe in 
1921 and 1922 
OBSERVATIONS AT WASHINGTON, D. C. 
Date of— 
Number of beetles : rE l Length Remarks 
gence | 
1921 | 1921 Days 
OR... ee OE BORA ee ea eer mates June 27 | June 29 2 | No feeding. 
Ges eS a OO UP a eels 27 | July 1 4 Do. 
D2). Be A TALE Oe ie eas Pee 27 | 2 5 Do. 
= es Be ate oS 8 ee Ue ek ee Re en ol x Poke A 20} 9 12 
| IE RPE oy fe Fb me ae ee eee eae eae ee ni eS 274 21 24 
122 ea: RG ee Wee eee 27 | 27 30 
Li... S3e_ ee ee AE eee 27 | Aug. 17 51 
Gi 2 UE ns _ A ne eee 27 | Oct. 19 114 | 4 eggs from 1 beetle. 
SU 2 SR ee se | 27 | Dee. 4 160 | 58 eggs. 
ime 1922 
gee Ae ec: Se EBS Oe Se ees 27 | June 26 364 | 51 eggs. 
OBSERVATIONS AT DOYLESTOWN, PA 
| 
1921 | 1921 | 
PER On ee Be _< Mkseegegih eae cate PER tek ee June 1 | June 16 15 
Ae PE Re eo on See Rh ater aoe ee 1 | Sept. 6 97 | 40 eggs. 
Hee ee ee eae ik Oe ee ee ee 4\July 7 33 | No data on egg deposition. 
FEE. ape Sie Se Ea ER oe a tee July 2/ Oct. 3 93 Do. 
Usa See A Bel 2 See eet Pe ees 2 ee ee os 2S | Aug. 3 | Sept. 22 50 Do 
DAES eS Bs el ee eS ae aR ae 3 | Aug. 30 27 Do 
SET SE ee RS Oe ee een eee es FT eh Pes At Och oad 74 Do 
1922 | 1922 
Mee So ee den ele! Pee Sa REEL eee S June 27 | June 2 1 
De aN OEE SOC TRS Se IG ee ae ere EA EE Oe 27 | July 25 28 
Ae SR os a 2 SS oo BSC UREA BA Debs 30 | Aug. 14 45 
Dee a ee eee EE ee July 7 14 38 
1 isles eh ae Reg tice i SR races a Rae Sa PN = ree Lg htt she 17 | Nov. 1 107 
PASE Re a ei Ee SP EO: ee ED hee 27 | Aug. 21 25 
es eae ee ee, ie a Ee 27 | Sept. 21 56 
PS SER RAARD Bald. 2 Pla GR AS Ee CML BEER 29 | Aug. 3 5 
fateh ne a a LS eee Eee: 29 | Oct. 26 89 
i hese a lip ic Ma pga eet a ai i AI ste tN ao Aug. 1 | Aug. 22 | 21 
RR PLEA CV Ce Oe ie Ree 7 | Nov. 1 86 
1 AS ie SA Sere, ie I ae ek a 16 | Sept. 21 36 
"Potal, 45. 2u/2-0- 2 5 ok a ee ee BE: 2, 343 
c Days 
‘Averace.length of life. 2222S te Se ee bh ae eee 52 
Niaximannieneth ol lites ore! Sik ne Be PN Re BS ee Re Te eee a ne oe eee Sees eee 364 
Minimunrieneth of life - 22. = = == ae a ee ee eee 1 
2 
4 
