Callage. 267 



be checked whenever opportunity offers. Halsted has success- 

 fully treated club-foot by applications of air-slaked stone lime, 

 used at the rate of 75 bushels per acre. This remedy should 

 be given a thorough trial. 1 



INSECT ENEMIES. 



Cabbage Aphis (Aphis Brassicce). Description. This insect 

 is one of the many forms of plant lice with which gardeners 

 have to contend. It is a small, greenish-blue insect which, if 

 unchecked, increases at an astonishing rate. It is almost con- 

 tinually protected by a gray flour-like covering which renders 

 treatment difficult. As with all other insects which propagate 

 rapidly, it is essential that those found early in the season be as 

 completely exterminated as possible. 



Treatment. Poisons which penetrate the outer coverings of 

 the insect are to be recommended. It is difficult to make mate- 

 rials adhere to either the foliage or to the insects, and for this 

 reason they must be all the more carefully applied; kerosene 

 emulsion, tobacco water, hot water, pyre thrum, etc., are all 

 effective if properly used. 



Cabbage Plusia (Plusia Brassicce, K.). Description. The 

 adult insect is a dark-gray moth about an inch in length hav- 

 ing a small silvery spot and V-shaped mark in the center of 

 each fore wing. The moths appear in spring and lay their eggs 

 generally on the upper side of the cabbage leaf. They hatch 

 into green larvae which feed upon the foliage of the plant, fre- 

 quently burrowing through and through the cabbage head, 

 practically ruining it for market. The worms also feed upon 

 lettuce, endive, celery, and other garden plants, their treatment 

 being the same as here described. These worms are span-worms ; 

 they progress by looping the body and then straightening it. 

 When full grown they are about one and one-half inches in length. 

 The larvae then spin cocoons, pupate, and in a short time the 

 adult moth appears. There is more than one brood each season. 



Treatment. The remedies mentioned under CABBAGE-WORM 

 may be used successfully against this pest also. But if pos- 

 sible, greater care should be exercised in destroying the plusia, 

 since on account of its tunneling habits it inflicts more damage 



1 JT. J. Agric. Exp. Sta. 7th Ann. Kept. 1894, 288. 



