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Other insects, such as the Hessian fly, the green-bug or spring grain aphis, the army-worm and various species of grasshoppers are killed by tiny parasitic insects whose eggs are laid in the bodies of the larger insects, but which, after being hatched, feed on them. To these natural methods of control man has added others. Cultivation is one of these methods.
In all localities the "army-worm" made its appearance in July and August, and swept away almost the entire crop. Many plantations that were expected to yield a thousand bales did not yield a hundred, and some of them made less than ten. The appearance of this destructive worm was very sudden.
Maybe the merchant hears of the army-worm and is alarmed, but the colonel writes back assuring letters that it is only the grasshopper, and the grasshopper has helped more than hurt and draws. Then possibly the army-worm comes sure enough, and cripples him. But he keeps up his courage and draws.
The moth that indicates the advent of the army-worm has a Quaker-like simplicity in its light, chocolate-colored body and wings, and, from its harmless appearance, would never be taken for the destroyer of vast fields of luxuriant and useful vegetation.
Worms find their way to the roots; the caterpillar eats into the "boll" and destroys the staple. It would be almost impossible to enumerate all the evils the cotton-plant is heir to, all of which, however, sink into nothingness compared with the scourge of the "army-worm."
The Apple Codling-Moth. Bulletin 41. Price 20c. The Gipsy Moth and How to Control It. Bulletin 275. The Brown-tail Moth and How to Control It. Bulletin 264. The Spring Grain Aphis or Green-Bug. Bulletin 93. The Army-Worm. Bulletin 4. The Hessian Fly. Bulletin 70. The Chinch-Bug. Bulletin 17. The Principal Household Insects of the U. S. Bulletin 4. Insects Affecting Domestic Animals. Bulletin 5.
They seem to spring out of the ground, and fall from the clouds; and the more they are tormented and destroyed, the more perceptible, seemingly, is their power. We once witnessed the invasion of the army-worm, as it attempted to pass from a desolated cotton-field to one untouched. Between these fields was a wide ditch, which had been deepened, to prove a barrier to the onward march of the worm.
Yet it had been plenteous enough to keep off the "rust," from which the dryer upland plantations were now suffering. Neither the "boll-worm" nor the dreaded "army-worm" had molested the river-fields; so the tall pyramidal plants were thickly set with "squares" and green egg-shaped bolls, smooth and shining as with varnish.
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