9 Department Circular 274, U. S. Dept. of Agriculture. 
If your farming organization is such that you feel assured that the 
peison applications will be made at the right time and in the right 
manner, and | 
If you are willing to spend the full amount necessary to provide 
an adequate supply of dusting machinery and poison. 
The general gains from weevil dusting under average, fairly favor- 
able conditions seem to be from 200 to 400 pounds of seed cotton > 
per acre, but owing to variations in degree of weevil injury it is not 
safe to expect much more than the lower figure. 
Consequently, you should not dust if the cost of the calcium 
arsenate, the cost of the labor to apply it, and the depreciation on 
the dusting machines will total more per acre than the current value 
of 100 pounds of seed cotton. 
Hand guns should be figured as depreciating 50 per cent in a 
season and the larger machines about 25 per cent. 
WHAT DUSTING MACHINE SHOULD YOU USE? 
Make your acreage allotment according to the following schedule, 
and buy a surplus rather than shortage of machines, as this will 
Save you money. 
HAND GUNS. 
Do not allot over 8 acres to one hand gun. 
Do not attempt over 25 acres in one organization with hand guns. 
Do not supply individual tenants with hand guns and expect each 
to care for his crop successfully independent of the others. 
Use hand guns only when no other machine is suitable. 
SADDLE GUN. 
The saddle gun is somewhat similar to the hand gun. It is operated 
from mule back by hand cranking. There are two nozzles, one 
extending down on each side of the mule, thus treating two rows at 
a trip. 
One of these machines should dust about 15 acres in a night of 
operation and should be allotted not more than 40 to 50 acres for the 
season. 
ONE-MULE MACHINE. 
This machine is drawn by one animal and operated between two 
rows of cotton. Several models are on the market. It sells at a 
medium price and is suitable for small farms. 
This machine will cover from 15 to 20 acres in a night of operation. 
Tt should not be allotted more than 60 acres for the season. 
This machine has only two nozzles but will usually cover three 
rows at a trip. 
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