' 
| 
| 
Se 
THE CRANBERRY GIRDLER. 7 
SEASONAL HISTORY. 
The seasonal-history data were secured on numerous bogs through- 
out the State of New Jersey and in rearing cages kept in a screened 
open-air insectary. Four-ounce ointment cans were satisfactory for 
securing the feeding, cocooning, and pupation data, while for ovi- 
position data and caging the moths a cloth-covered lamp chimney 
was found to fit tightly over a 1-ounce ointment can. 
ADULT STAGE. 
The time of emergence in the spring and summer depends largely 
upon whether the bog is a dry one or a flowed one and on the date 
of drawing the winter flowage. 
Dry-bog conditions—Cocoons kept at the laboratory during the 
winter of 1914-15, under approximately dry-bog temperatures, 
yielded moths from May 11 to June 18. In the cranberry bog where 
winter flowage was removed on April 10, moths began flying June 7. 
Winter flowage drawn May 10—This represents probably the 
average date at which New Jersey growers remove the winter flowage. 
From a large mosquito-bar cage placed over an infested area of 
cranberry vines bared of winter flowage on the 10th of May, adult 
emergence was noted from June 10 to July 8. The complete record 
appears in Table I. 
TABLE I.—Hmergence of cranberry-girdler moths on cranberry bog, Whitesbog, 
ees LO dey: 
: NE 
Date of removal from cage. a pubes Date of removal from cage. ome 
APE LO eee Sh pees sa ON dE ING) aM NWT EK2) d Uo ee AS ee ee eS ie apie ee ee a a 38 
AHIR Tk SS SS res a es ee eee AL Siete ULT LG) Dey ees ak ogee cies AKC eee ee Wine as oat aoe 10 
AUREL PA ee ee on Eee Nae 5 ce ee ADT en eee tte A ewe eee fae eee Cc See 1 
AUN WANES TUS eae i ee eae Tos eS LY RSS es See la som aes Oa es ee ae 1 
MUMeH Gee sees oe anaes eo oe eas to as 24 
\ 
Keeping the winter flowage on a bog until some time after May 10, 
in the region of New Jersey, produces a later emergence of moths. 
There is a date, however, which no one as yet has determined definitely, 
when, owing to the lateness of holding the flowage, the immature 
stage of the moth is killed. One observation was made in 1916 on a 
bog at Howardville, N. J., showing that, although the winter flowage 
had been held until July 12, a number of the girdlers in the immature 
stages were able to survive this treatment, and moths were found 
flying August 3. 
On grassy bogs and on bogs bearing a heavy mat of vines the 
emergence of the moths may be prolonged over a long period. At 
