April, ’20] 
DAVIS: GREEN JAPANESE BEETLE 
191 
area and that surrounding are being cleaned up. This clean-up work 
consists in cutting all wild shrubs and small trees along roadsides and 
back about 10 feet on either side. After cutting the brush is piled, 
oiled if necessary, and burned. For these purposes the implements 
most useful are the bush scythe, axe, bush hook, bush axe, hay fork 
and manure hook. In cases where the vegetation is dense and espe¬ 
cially where it consists of briers arid berry bushes, difficult to clean out 
by hand, it is burned direct, using a fuel oil flame. Such a flame pro¬ 
duced by forcing the oil through the spray nozzle, preferably one giving 
a fine, fan-shaped spray, is intense and very effective in burning stand¬ 
ing green vegetation. 
This work is being rapidly pushed this winter and next spring it is 
planned to salt these cut-over areas, using salt at the rate of about three 
tons per acre, to prevent a regrowth. According to Mr. W. Rudolfs, 
research student at Rutgers College, who is making a special study of 
the uses of salt for agricultural purposes, the salt acts as a destroyer of 
plant life when it is broken up into its component parts and the 
chlorine taken up through the roots thus poisoning the plants and pre¬ 
venting the proper functioning of the plant cells. Consequently the 
salt applications will be most effective when applied in spring as plants 
are actively growing and when a rain follows shortly after the applica¬ 
tion. Heretofore we have used arsenical weed-killers and while they 
are quite effective they have the disadvantage of making the vegeta¬ 
tion poisonous to cattle, which is a serious objection as anyone who 
has had experience with control projects will agree. 
(d) Barrier Band. It has been planned to construct a so-called 
barrier band completely around the area extending at least one-half 
mile beyond the exteme limits of known beetle infestation. In this 
band it is planned to cut, burn and salt all roadsides, headlands, 
fence rows, brushy woodlots, creek banks, in fact every area where 
wild vines and shrubs were growing excepting timber patches and to 
make it as free from favorite feeding and breeding places as practicable, 
and in addition to make this area undesirable for the beetles by keeping 
the remaining vegetation thoroughly coated with a repellent during 
the beetle flight. Heretofore a dust of arsenate of lead and lime (20- 
80) has been used, and while this material is an effective repellent it 
is poisonous to animals and on account of the scattering pasture lands 
a complete band could not be maintained. Sulphur and lime as a 
dust and lime-sulphur solution will hereafter be used as they are very 
effective repellents and are not poisonous to cattle. 
As long as the extensive headlands, ditch banks, fence rows, etc., 
continue in their present condition, that is, grown up with favorite 
food plants of the beetle, thus forming a network throughout and 
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