. Cyclopedia of farm crops. Farm produce; Agriculture. 252 COTTON COTTON part their lodging places and food supplies. A thorough dusting with Paris green will control the webworms and cotton-square borers. Plant-lice are destroyed by plowing under their host plants in late fall or winter. When it becomes necessary to take some other course, spraying with whale- oil soap, kerosene emulsion or tobacco solution is effective. Cutworms are controlled by placing about the fields bunches of grass or weeds im- mersed in Paris green. The better method, how-. Fig. 361. Mexican cottonboU- weevil. Enlarge
. Cyclopedia of farm crops. Farm produce; Agriculture. 252 COTTON COTTON part their lodging places and food supplies. A thorough dusting with Paris green will control the webworms and cotton-square borers. Plant-lice are destroyed by plowing under their host plants in late fall or winter. When it becomes necessary to take some other course, spraying with whale- oil soap, kerosene emulsion or tobacco solution is effective. Cutworms are controlled by placing about the fields bunches of grass or weeds im- mersed in Paris green. The better method, how-. Fig. 361. Mexican cottonboU- weevil. Enlarged. Fig. 362. Larva of Mexican cotton- boll-weevil. More enlarged. ever, is to kill them by thorough winter cultiva- tion, and keeping down all vegetation in the early spring. The cotton-worm {Aletia argUlacea), bollworm (Heliothis armigcr) and Mexican cottonboll-weevil ( grandis) are not so easily controlled, and their ravages have been costly. The cotton- worm is now more easily controlled than formerly. It is a blue-green caterpillar, with black spots and stripes on its back. It is most severe in late sum- mer, but is present the entire summer. There are several generations each year. The common method of combating it is to apply dry Paris green to the plants. The cottonboll-worm is a common garden pest, attacking various crops, as corn, tomatoes, peas and squash. The caterpillar is somewhat darker than the cotton-worm, but otherwise the two are very similar in their early stages. This, too, has several generations in a It is most effec- tively controlled by the planting of an early trap- crop. Sweet corn is much used. As soon as the corn is infested it is removed and destroyed or fed to stock. Lantern traps for the moths and arsenical sprays for the worms have given limited success. The most serious problem confronting the cot- ton-grower today is the control of the Mexican cottonboll-weevil, which is threatening the de- struction of the industry. The wee
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