STRAWBERRY ROOTWORM ON GREENHOUSE ROSES hs 
bed from plant to plant is indicated by the fact that when confined 1n 
pill boxes or cages with soil they pulverized the earth very thor- 
oughly. F 
MOLTING 
Very little is known regarding the number of molts and the time 
of molting. One larva which was 4 days old was seen freeing itseli 
from the old skin. This was probably the first molt, but nothing 
further was noted. 
DURATION OF THE LARVAL STAGE 
From an examination of Table 11 it will be seen that the duration 
of the larval period is from 33 to 74 days. Seasonal conditions, as 
well as moisture and temperature, undoubtedly aff<ct the length of 
this stage. In cases where the date of pupation was not noted, the 
duration of the larval period was calculated by deducting 8 to 11 
days, the time usually required for the pupal stage, from the num- 
ber of days between hatching and the emergence of the adult. 
TABLE 11.—Duration of larval and pupal stages of the strawberry rootivorm, 
1920, 1921, and 1922 
[Observations taken at Dovlestown, Pa., except those on June 11, 12, and 14, 1922, which were taken at 
Washington, D. C.] 
Date of— Duration of stages 
eas ‘: 
er 0 Pui 
indi- Emer- | Larva Remarks 
viduals Hatching Pupation 4 Larva Pupa and 
gence 
1920 1920 1920 Days Days Days 
lererat: ce Mara O4 ear. Se June 4___-_ June 16_ 72 12 84 
peep =e DAs corte dy ee Geet 18_ 74 12 86 
Dee eMC Sra dew ANU alee ae Aug. 14_] 58 to 59 13 | 71 to 72 
15S Ee Sands aaa 1to5 16_| 58 to 63 | 11 to 15 | 73 to 74 
AAT LD Bi Oo am de4aees 1to5 18 | 58 to 68 | 13 to 17 | 75 to 76 
1921 1921 1921 
1 aed Hes IVEY Sew ey Ae 5 A eee aD Afiwbatey, 2S) sos eee ae ee mi tie 58 | Pupation not observed. 
Hel ees eee eee SS eeN ol NOUN Ze yikes en | ad tb tl Ni ieies pa Eas sea eae Oe Ty eee ihe Hatching not observed. 
22 oo SS ee Ly Sek ee er Due UA sal a g  se A TKO) (elles Site Mate at Do. 
Rep | eer aise ile Bek ees Sas fe pass Wee feta edge 2 we ls es Do. 
Oh ifs Sal ee a ane ee ee PAUL os i fiends | AC UT Oo raili'y a1 jaa me eee TILA: PROB RSS eS 1 Do. 
eee | 2 | es ees coon ere eeeeah bays eae: aL 4s) eres eal Oli ina nes Do. 
1922 1922 1922 
[le Ae ee a ae eh CUI hate Abo HALLS Ifwesnes WH eases | NOG hee Do. 
Be -2| Ayo, BO) iO Ile ee ee Zia |ne eee i510) Dieu papion not Observeds 
ete. Set 30 to May 6 |___--- steph A BOR Reis emee eee Meee mle he TOO Do. 
sea eee NY Beohtaret | Repo eee es Julyen Dae e Sele as Lays) gf ev nt Secs MPVs __._-| Died before emergence. 
ici PA ee oe Se eas Wes il duly Bye 54 8 62 
iL eee Die tat Re Sd AUS Aas ool 23 Ca ae A) came Rye ee Do. 
eer ae Oe nied: 1p ORR ca ei Ara eo Hee ely Do. 
(|e i SiN eal Neatet aM ie Bef MES une OE aaa ON i A Ly 57 | Pupation not observed. 
Be we's Fo | jst 2 nee sree ee ieee ait eis ASEM De ieee CON Mien 56 Do. 
it aera ar eas Sh is aie Ube Wye 2) Ave. oil 50 | 5 5) 
eee es 23. (ASS EL Vas at Seles PAT es ae ke 50 ey 61 
Sates wa DB eel sepia be PATO IG ek we [Na aes a PAN Wlcew nw ea Mier ew ' Died before emergence. 
iL Saale 1S MORAN All he AA es sen Tuller D5 eee were s [Lak DRO? 44 | Pupal stage estimated 
| | as 8 to 11 days. 
9 Shee = INS Bist Same Pata sp gb aty9 PE ane ol a Bs eah| 43 0. 
Sie sie iL a BER, ee fuerused Bape Fie Ee a 41 Do. 
: : Days 
PeVcHAPeleneniuotlanvalisnage: (based om 28\specimeris)ae. 2. Pele i 58 
Avi IMNTREMe Tam Ollanvalestacomm te tee nee meee rue Cem anes co Uk Min Menta Siheee Mur aehnyiecus kumbimcein 74 
SP oiaimniencr wai lanval shagel i wu Wess A ahs fae ies) sa) sesh ee Sus oreo Te 47 
Siinimimvencphomlanvalshage (Cstimaged yum 02 Loa ueeu ie es Vi iva MNT irrg: ph ie. m ut LOIN El ee 33 
B.Veragelength of pupal stage (based on 33 specimens). 220512. ke Sa A 10. 9 
Piaxmummenetinofmiupal stage:..-- 0.2 2g 2) ee BE ooh ce SO ee a V7 
MLLER DE Vere ei, Gie FOU SpEN revere INE Si ee CI Athearn) ee Ope oe ty Oc 5 
