Oe TE ON Re I I bse Oak et Oat hay 
on 5 
THE CRANBERRY GIRDLER. 15 
this treatment is very satisfactory from the standpoint of destroying 
the girdlers, it may result in a very poor bud formation and a light 
crop of berries the following year. Some of those who have tried 
holding the flowage until mid-July have reported that the crop 
the year following yielded an increase of 100 per cent over a normal 
one, showing that this treatment may be used without monetary loss, 
provided frosts, which may destroy part of the prospective double 
crop, are not encountered in the cropping year. 
Holding the flowage until July 14 or later results in the loss of 
the current year’s crop, but this procedure is good practice where the 
girdler infestation is severe and perhaps complicated by an infesta- 
tion of the blackhead fireworm (hopobota vacciniana. Pack.). 
Considerable expense is saved the grower by allowing the bog to 
go one year without a crop, and the treatment always results in 
producing a cleaner bog, especially if the one so handled has been 
invested by grass and weeds. 
June 18 is the latest date, in the knowledge of the writer, to which 
the winter flood can be held and a good crop secured the same 
season. This was accomplished on a deep-flowed bog of Early 
Black vines near Pemberton, N. J. 
In the event of holding the winter flowage until July 15, or a 
little later, successful control of the girdler will be secured, but not 
extermination. A few of the insects will escape even this treatment, 
and at the end of three or four years the infestation again may. be 
severe. The mistake made by many growers is in permitting the 
injury to assume large proportions before attempting control. The 
first signs of girdler injury should be noted and the remedy applied 
before the pest gains headway and large areas of vines are destroyed. 
The presence of large numbers of the moths on a bog in June and 
July should serve as a warning that the vines are in a fair way of 
being severely damaged. 
FALL FLOODING. 
Fall flooding affords the most satisfactory control of the girdler, and 
will result in practical extermination of the pest until reinfestation 
comes from the upland or other bogs, if it is applied at the proper time. 
As shown in the study of the seasonal history, the larve make co- 
coons in the fall, and if the fall flowage is apphed after the cocoon 
is formed, the larva within will not be injured, even though this 
flowage lasts two weeks or more. However, if the flowage is applied 
before cocoon making begins, the naked larvee will be killed certainly 
in a week, and it is probable that five days is ample time for sub- 
mergence, although some growers prefer to hold the flowage two 
weeks to insure a thorough treatment. 
For New Jersey, cocoon making begins in a large way the first 
week in October, and it is therefore essential to reflow the bog dur- 
