17 
Only these burrows should be treated. Clean-cut empty holes in the 
trunk indicate that the insect has become adult and left the tree. It 
is, therefore, a useless waste to inject the liquid into such holes. In 
peach, plum, apricot, and cherry trees (all stone fruits), an abundant 
exudation of sap through the outlet of the burrow causes a ball of 
gum, mixed with castings, to collect around the hole. This should be 
scraped off before the treatment is applied. 
Method of treatment.—Having cleaned out the mouth of the hole as 
well as possible, inject a small quantity of carbon bisulphid and close 
the hole tightly with a little grafting wax. This will quickly kill the 
borer and will not injure the tree; it also saves the additional injury 
which would necessarily be made in cutting out the borer. The say- 
ing of time alone will fully pay for the small amount of carbon bisul- 
phid required. The liquid may be conveniently applied by means of 
a spring-bottomed oil can. 
DESTROYING SUCKING INSECTS UPON SMALL PLANTS. 
The principal pests included in this group are such insects as plant- 
lice, which frequently damage melon and squash vines. ‘‘ The treat- 
ment, as successfully practiced by Professors Garman and Smith, con- 
sists in covering the young vines with small tight boxes, 12 to 18 inches 
in diameter, of either wood or paper, and introducing under each box 
a saucer containing one or two teaspoonfuls (1 or 2 drams) of the bisul- 
phid. The vines of older plants may be wrapped about the hill and 
gathered in under larger boxes or tubs, and a greater, but proportional 
amount of bisulphid used. The covering should be left over the plants 
for three-quarters of an hour to an hour, and with 50 to 100 boxes a 
field may be treated with comparative rapidity.” 
A slight improvement upon the foregoing method of introducing 
the bisulphid is to borea hole about 1 inch in diameter in the middle 
of the top of each box. Under this hole, inside the box, fix a small 
bunch of cotton waste, rags, or almost any absorbent material capable 
of taking up somewhat more liquid than it is intended to use; fit a 
stopper to the hole outside and the box is ready for use. Place it 
over the plant, being careful to see that the edges set into the dirt 
all around; remove the stopper; pour in the desired amount of liquid; 
replace the stopper and leave the vapor to do its work. This obviates 
the necessity for saucers and saves the trouble of handling more than 
one thing when moving from vine to vine. The carbon bisulphid 
might be easily carried in, and poured from, an ordinary gallon oil 
can such as is used for kerosene. 
TREATMENT OF STORED PRODUCTS. 
Agricultural products are frequently brought together in store- 
houses, mills, etc., in immense quantities, and, when allowed to stand 
13003—No. 145—02 2 

