. Cotton or boll weevils. Boll weevil; Cotton. 10 MISC. PUBLICATION 4 8 4, U. S. DEPT. OF AGRICULTURE right and to find out the best and least costly way of using the calcium arsenate dust. Cotton planters were afraid at first that the expense would be so great that it would not pay to dust their cotton. They know now, however, that it will pay if the weevils are seriously hurting the crop and if the land on which the cotton is growing is rich enough to produce one-third of a bale to the acre when there is no boll weevil damage, Planters have learned also that if the dust is put on the plants
. Cotton or boll weevils. Boll weevil; Cotton. 10 MISC. PUBLICATION 4 8 4, U. S. DEPT. OF AGRICULTURE right and to find out the best and least costly way of using the calcium arsenate dust. Cotton planters were afraid at first that the expense would be so great that it would not pay to dust their cotton. They know now, however, that it will pay if the weevils are seriously hurting the crop and if the land on which the cotton is growing is rich enough to produce one-third of a bale to the acre when there is no boll weevil damage, Planters have learned also that if the dust is put on the plants at the right time and in the right way a good crop will follow. Poison dust cannot be put on the plants in the right way without proper dusting machines, which are specially built for this work. There are many kinds of these machines on the market, the hand dust gun being the smallest. As shown in figure 6, the man who uses the. Figure 6.—The hand dust gun is the smallest machine for dusting cotton plants with calcium arsenate to kill the boll weevil. The man who uses it turns a crank, which causes a fan to blow the dust out of the long nozzle sticking out of the front. hand dust gun walks between the cotton rows and turns a crank on the machine, which causes a fan on the inside to blow the dust out of the long nozzle at the front. The man who operates the machine must keep the end of the nozzle pointed toward the cotton row while he turns the crank, so that the dust will be sure to fall on the plants. It is very hard work to operate one of these machines all day long. Hand dust guns cost from $12 to $20 each, and one gun can be used to dust 8 to 10 acres of cotton over the season. The one-mule machine is pulled by a mule or horse, which walks between two rows of cotton. There are two nozzles sticking out behind this machine, as shown in figure 7, and the dust is blown through them onto two rows of cotton as the machine moves through the field. This machine costs from $75 to
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