28 The Bulletin. 



Mr. Chittenden,* however, prefers to use the Paris green as a spray 

 in water. He says : ''It may be applied either dry or wet, preferably^ 

 however, as a spray, at the rate of about one pound to 150 gallons of 

 water. It should be applied when the plants are first set out so as to 

 insure the poison reaching the young larvae before they have burrowed 

 far into the heads. Other applications should follow as required. These 

 can be made with absolute safety until the heads are about half formed 

 and, for that matter even later, as the poison disappears from plants 

 almost completely within three or four weeks after application." 



Contact Remedies. — A considerable number of substances have been 

 recommended for applying to the plants so as to actually come in con- 

 tact with the worms, such as hot water applied with a sprinkler, strong 

 soap solution such as is mentioned for cabbage louse on page 10, an 

 emulsion of kerosene containing 10 per cent of oil (directions on p. 40)^ 

 and dusting with air-slaked lime or sifted ashes. No doubt all of these 

 have some good effect, and at least some of them are so simple as to be 

 available to everyone. 



Bran Mash.^ — -Mix one ounce of Paris green with two pounds of bran 

 (wheat bran perhaps best). Mix in enough sugar to give some sweeten- 

 ing. It may then be sprinkled on dry, or if preferred, water may be 

 added and the mixture applied wet. The worms are attracted by the 

 odor and taste and are killed by the poison. (Page 40). 



Hand-picking.- — In small cabbage patches the worms may easily be 

 kept down by looking over the plants occasionally and picking off all 

 worms that are seen, crushing them under foot or between the fingers. 

 The worms are easily crushed by slight pressure, a quick firm twist 

 between the thumb and forefinger being sufficient. Crushing under 

 foot is much slower. The finger method is perfectly simple, and quite 

 rapid. The worms are harmless to persons, and any objection to the 

 method is quickly overcome with a little practical experience. 



Destruction of Remnants. — Cabbage worms may come to maturity 

 on the old leaves left on the stems when the head has been cut. It is 

 therefore desirable to destroy all such remnants as promptly as possible. 



Suggested Remedies. — It has been suggested that ordinary corn meal 

 sprinkled into the heads protects them from worms. We have never 

 tried it, and do not know of definite experiences. 



Upon two or three occasions persons in N'orth Carolina have told 

 the writer that cottonseed meal is a good remedy. It is said that it 

 should be dusted on in evening or early morning, and that the dew forms 

 it into a paste. The worms in feeding on it or in crawling about, get ' 

 this paste on their bodies and the sunshine afterwards hardens it, thus 

 practically baking the worms in the dry paste. We have not tried 

 this, and doubt its efficiency, but there is some logic in the reasoning. 

 We have also been told that if a broad [eaf be picked from the plant 

 and laid flat over the head of cabbage that the worms will congregate 

 on its lower side, where they can be easily destroyed. We have not 

 tried it. 



•Circular No. 60, Bureau of Entomology, U. S. Dept. Agr., p. 6. 



