VARIOUS INSECTS 305 



ized by a stationary scale-like appearance. Lime-sulfur and 

 miscible oils are the best remedies. Species which migrate on to 

 the young growth in spring can be readily dispatched at that 

 time by kerosene emulsion. 



Snails. — These animals are often very troublesome in greenhouses, 

 eating many plants voraciously. 



Preventives. — Trap them by placing pieces of turnip, cab- 

 bage, or potatoes about the house. Scatter bits of camphor-gum 

 about the plants. Strew a line of salt along the edges of the bed. 

 Lime dusted about the plants will keep them away. 



White ants or termites. — These insects often infest orchard trees 

 in the southern states, particularly in orchards which contain 

 old stumps or rubbish. 



Remedy. — The soap-and-arsenites wash brushed over the trunk 

 and branches of the tree. 



Wire-worm (various species). — Slim and brown larvae, feeding upon 

 the roots of various plants. They are the larva) of the click- 

 beetle, or snapping-beetle. 



Remedy. — Arsenicals sprinkled upon baits of fresh clover or 

 other material which is placed about the field under blocks or 

 boards. Sweetened corn-meal dough also makes a good bait. 

 The best treatment is to plow infested land early in the fall. A 

 system of short rotations of crops will lessen injury from wire- 

 worms. 



Insects classified under the Plants they chiefly Affect 



Apple. Apple-bucculatrix (Bucculatrix pomifoliella) . — A minute 

 yellow or green larva feeding upon the upper surface of the leaves, 

 causing the lower surface to turn brown. The cocoons are white 

 and slender, and are laid side by side upon the under side of twigs, 

 where they are conspicuous in winter. 



Treatment. — Lime-sulfur while tree is dormant. Arsenicals 

 for the larvae in summer. 

 Apple-curculio (Anthonomus quadrigibbus) . — A soft, white grub, 

 about half an inch long, living in the fruit. 



Treatment. —Clean cultivation. Rake the small apples that 

 drop early out into the sun where they will dry up. See Plum- 

 cuRCULio, p. 329. 



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