THE CRANBERRY GIRDLER. 13 
the moths, frightened from the vines, rose into the air the swallow 
darted for them and captured many. 
At present, natural enemies do not appear to be potent factors in 
the control of the girdler on cranberry bogs. 
REMEDIAL MEASURES. 
Under the heading of remedies fall such methods of treatment as 
spraying, the use of repellents, burning, trap lights, flooding, and 
sanding. Of these measures, flooding and sanding have given the 
best satisfaction, as indicated by the work conducted in New Jersey. 
SPRAYING. 
Owing to the habit of the larve of feeding on roots and runners 
under cover of the trash beneath the vines, there seems to be no hope 
of developing a method of combating them in which reliance can be 
placed on spraying. In addition to the trash which hides the larve, 
the dense mat of vines covering the bog prevents a large portion of 
the spray material from reaching even the trash. 
REPELLENTS. 
It has been suggested occasionally by growers that commercial 
fertilizers might act as repellents of the girdlers and at the same 
time stimulate the vine growth. The opportunity to study this 
method of treatment was afforded at Whitesbog, N. J., where fer- 
tilizer experiments on cranberry bogs have been carried on by the - 
New Jersey experiment station for a period of four years. No fer- 
tilizer was applied to the plats the fourth year, owing to the exces- 
sive vine growth produced during the previous three years. Muriate 
of potash has been held by some to afford protection from certain 
msects owing to its repellent action, and four of the plats to which 
this material was applied, along with other ingredients, were kept 
under observation by the writer. The data in Table VI?! show the 
fertilizers and the amounts applied on four plats, consisting of one- 
twentieth of an acre each. 
Taste VI.—Hzxperiment with fertilizers as repellents against the cranberry 
girdler, Whitesbog, N. J., 1915. 
Plat No. Fertilizer tested. Plat No. Fertilizer tested. 
LL eas eee ee 10 pounds muriate of potash, 25 || 29.......... 10 pounds muriate of potash, 15 
pounds acid phosphate, 10 pounds pounds phosphate rock, 10 pounds 
ammonium sulphate. ammonium sulphate. 
1S aces 10 pounds muriate of potash, 25 || 31.......... 10 pounds muriate of potash, 15 
pounds acid phosphate, 20 pounds pounds steamed bone, 10 pounds 
dried blood. ammonium sulphate. 
i Hxtracted from Proceedings of the 46th Annual Meeting of the American Cran- 
erry Growers’ Association. 
