She 
STRAWBERRY ROOTWORM ON GREENHOUSE ROSES 19 
TaBLe 9.—Variation in length of the period of incubation of eggs of the straw- 
berry rootworm beetle during 1920 and 1922, by months 
f 1920 
Number of eggs hatched during— 
Total 
Period of incubation “s a ail i thee 
Daa May | June July August hatched 
Days ; 
Qn------------ ~~~ =~ ---- 2-72 -~ 2-7-2 = === 07 0 0 2 0 2 
nnn Ae EE a ak Le ale 0 0, 2 6 0 8 
2 ae hh 2 USI Aiea Go oe ates ae 2 0 0 |: 4 1 0 5 
noe oer ee Ege a eee Jul BE 0 1 ib 0 0 2 
“hes Jat SE ie ee ec ee 0) 3 + | 0 0 3 
oo et La PR NE See cae ce | 5 1 0 0 ng 
memes eS LTE ey a ee 6 12 0 0 0 18 
“1 SO ES aes aes sien el Nd 1 | 2 0 0 0 3 
cee Ail Re er RAR Se Ua Oa ees Gian) 0] 0 0 2 
Meverage invdayeue ces Se! 12.89 | 12. 68 RL Eee 0 11. 32 
1922 
Eee ears yn Aud Sere fea ey Rese A EE A ESN 0 0 07 6 0 6 
cre cn a aE RS a a sty ie OE 0 0 0 | 1 0 1 
Pape rape a ae SIN ei aN I eM 8 1 0 0 7 0 8 
To ni eae gS Sen TAR a a 1 0 158 707 99 965 
oc Ls OS i el Sas DR ga 0 0 174 58 245 477 
“a mpl ee Dea ete CGN a 0) 14 389 577 166 1, 146 
LD 2 2 RAR aE ooo OE IM IC 2 | 119 393 244 137 895 
pram ihe! 215 Cio Oi WE NONE chy ii 52 160 | 327 56 596 
RD es hs, AE We Ot Tree 6 | 208 115 | 45 17 391 
11 ec psega  8  eph is AN TE NIG eae k Ae 10 34 4 49 6 103 
Meena) ek See ote aa LR Ae MBC Tag a 8 68 64 27 0 167 
1S. noe oa es OE NS Ue Ree ein 9) 74 0 0 0 83 
Dk aa TE OA eee ae 40 | 62 0 | 0 0 102 
7 a TOE AAPG A Na eae 25 54 0 | 0 0 79 
OE, cece ia TR A Ne 35 | 12 0. 0 0 47 
ee eT Tye NN ot AB 0 13 0 | 0 0 13 
na oN ig SE ae Ee SOE I 2 2 (On 0 0 4 
Ae el Tae ee Ae 0 1 0 0 0 1 
Ee to TONG ote tha aa ge 0 0 0 | a0 0 0 
On Ee EL SE OSs eres) On ee ea 1 0 0 0 0 il 
——.<$ —__—_______ ———— |——$ —_- | —— SSS | SS 
A QTETES AEA (GLE Se ea a i IL 15. 96 13.07 | 9. 62 8. 92 8. 84 9. 89 
TABLE 10.—Time of deposition and hatching and period of incubation of eggs of 
the strawberry rootworm beetle in 1921 
Number of eggs— | Number of eggs— 
ppate of wee of eh ae of aT poate of ene 
eposition | ae atching : eposition i atehing Fs 
| Depes- Hatched |. period Denes; | Hatched |.) 45 qpeed 
| | 
| Days ‘Days 
Mar, 22 foe Apres See a Aur enn Giana = 33 Ato 262% 20 
Mer ASasccre | 2 PA 21 || Gael 19 1 D6n8 20 
5 (Ui il 4 262) Di LOM eos! 33 2| May 9-- 20 
31 | 8 Sime 18 | Zia | 26 2 4 18 
ik ae | 2 Dien 21 || Paige A 36 4 on P18 
/ Sipe can | 3 19_. ii 
4 | 7 26_. 22 
Sia 2 Dian 23 || ; 
HATCHING 
Observations on the hatching of two larve, A and B, were as 
follows: When first observed A was yellowish in color with a trans- 
parent head and dark brown mandibles. It had already broken or 
chewed one end of the shell and had freed its entire abdomen by 
