a. 
THE CRANBERRY GIRDLER. 19 
emerged per square foot in the unsanded plat as compared with 
1.61 moths in plat 1, sanded. Plat 3 was known to have a lighter 
infestation than the others when the experiment was started. 
There were one or two places, particularly around a stump, on 
the sanded areas where the sand had washed a little thin during the 
period of winter flowage, but these spots were insignificant in size, 
and the data presented lead to the conclusion that a 1-inch coat of 
sand applied under natural bog conditions with a great deal more 
care than would be given by the average grower is not effectual in 
preventing the emergence of girdler moths from their cocoons. 
RECOMMENDATIONS FOR CONTROL. 
The most effective contro] measure that the writer has seen ap- 
plied for this insect is the fall flooding immediately after picking 
the crop, when this operation can be completed in time to apply the 
water before the last of September. This treatment is effective, be- 
cause it comes before the worms have spun their cocoons, and a 
reflow lasting not more than a week is undoubtedly of sufficient 
~ duration to Inll all naked girdler larve. 
If the berries can not be removed from the vines in time to per- 
mit fall flooding before the last of September, or if the water supply 
is insufficient, the next best method of control is to hold the winter 
flowage over the vines until July 20, thereby losing one crop of 
berries, but gaining a clean bog and the possibility of having a crop 
_ twice the normal in quantity the following year. 
In the event that the foregoing remedies can not be employed, 
recourse may be had to sanding and better cultural methods. It is 
doubtful if a coat of sand less than 14 inches in thickness can be 
relied upon to prevent emergence of the girdler moths and, while 
this is an expensive operation, there are many New Jersey bogs, 
particularly those having peat or mud bottoms, which would be 
benefited greatly by a thorough sanding. A 1-inch coat of sand will 
be found of value for invigorating injured vines and in so far as 
it covers the trash on the bog floor will render conditions less favor- 
able for further infestation by the girdlers. If the fruit produced 
on sanded lands is less sound than it was prior to sanding, this con- 
dition may be corrected to a large extent by spraying with Bordeaux 
mixture in the proper season. 
Pruning, along with sanding, should be practiced, and these meas- 
ures, together with the removal of obnoxious weeds and grasses, con- 
stitute better cultural methods, all of which aid very materially 
in making cranberry vines healthier and freer from damaging 
insects. 
