168 INSECTS AFFECTING VEGETATION 



habits are much the same as those of the rest of the family. Its 

 attacks on the young plants when they first come up are often very 

 serious and prevent the growth of a large proportion of the crop, 

 necessitating a resowing. As the first brood of beetles disappears 

 toward the end of June it has been found that turnips sown during 

 the third week of that month escape attack, and produce as good a 

 crop as those sown earlier. When the beetles are observed to be 

 attacking the young plants they may be got rid of by dusting with 

 Paris green and land plaster, one pound of the poison to twenty of 

 the plaster ; this should be done when the plants are moist with dew in 

 the early morning. A condition of the soil which induces rapid and 

 vigorous growth is of great importance, as it enables the young 

 plants to get beyond the danger point before much injury has been 

 sustained. 



INSECTS AFFECTING THE SWEET POTATO. 



The Sweet Potato Flea-Beetle. This is a small bronze or brassy- 

 brown beetle about 1/16 of an inch long. The eggs have not been 

 observed but the larva and pupa have been found on birdweed 

 roots. The plants should be dipped in arsenate of lead, one pouijd 

 to six of water, before being set. 



The Two-Striped Sweet Potato Beetle. This is one of the Gold- 

 Bugs or Tortoise-Beetles. Its color is rather dull brownish-yellow 

 with only a faint golden lustre while on each wing cover there are 

 two black stripes; the insect is ^4 inch long. The larva is dirty 

 yellowish-white. 



The Golden Tortoise-Beetle. This species is a uniform golden 

 yellow and measures ^ inch in length. The larva is dark brown 

 and carries its excrement about on an anal fork. 



The Black-Legged Tortoise Beetle. This beetle is 5/16 of an 

 inch in length, golden but not so brilliant as the foregoing and has 

 three black spots on the wing covers and black legs. The larva is 

 pale yellow. 



The measure used against flea-beetles, dipping, will prove suffi- 

 cient to control this group of beetles ordinarily, but should the larva 

 become numerous later, spraying with arsenate of lead, 2 Ibs. to 50 

 gallons of water, should be effective. (N. J. Agr. Exp. Sta. Bui. 

 229.) 



BULLETINS USED ON VEGETABLE INSECTS. 



Bul. 171, Ontario Dept. of Agr., also Cir. 135, U. S. D. A. B. E. ; 

 Bui. 233, Mich. Agr. Exp. Sta. ; Bul. 114, Ky. Agr. Exp. Sta. ; Bul. 2, 

 Va. Truck Exp. Sta. ; Bul. 45, Ga. Agr. Exp. Sta. ; Bul. 45, Fla. Agr. 

 Exp. Sta. 



INSECTS AFFECTING GRAIN. 



[The pests of wheat and corn include all the principal in- 

 jurious insects that attack barley, rye, oats and all other grains. 

 For such injuries refer to corn and wheat insects.] 



INSECT ENEMIES OF CORN. 



The insect enemies of Indian Corn are legion, and may be 

 found attacking every part of the plant, root and stem, leaves and 



