400 Rei>ort of the Entomologists of the 



sprayed in 1 day. Not much over 2 acres of cauliflower, large 

 or small, could be sprayed in 1 day, as more care must be 

 used in doing the work. At least 2 applications should be made 

 on late cabbage and cauliflower. This would require 1 pound 

 of Paris green to each acre. The entire cost of materials used 

 would not exceed 50 cents per acre for 2 sprayings. Hence 

 the principal cost of spraying would be the labor required to pre- 

 pare and apply the mixture. One man could prepare enough of 

 the stock solution of resin mixture in one-half day to last the 

 whole season. From the foregoing estimates the whole cost of 

 spraying a given number of acres can be easily calculated. For 

 10 acres, the cost of materials would be $5.00; allowing $1.50 

 per day for labor, the cost of preparing the stock solution of resin 

 mixture would be 75 cents and the cost of making 2 applications 

 to 10 acres would be $15.00, making a total of $20.75. 



REASONS WHY RESIN LIME MIXTURE IS PREFER- 

 ABLE TO OTHER SUBSTANCES. 



Ever since the introduction of the European cabbage butterfly 

 into this country, growers of cabbage have been using various 

 materials and measures in an endeavor to prevent its ravages. 

 Some of these means have yielded fair results, but more have 

 proven worse than useless when carefully tested. 



There are several reasons why better success has not followed 

 the use of a few of the most reasonable measures that have been 

 adopted. Chief among these is the fact that it is a difficult mat- 

 ter to make any of the substances that have been used adhere to 

 the foliage of the plants on which the cabbage worm feeds. As 

 a general rule growers of cabbage have only used insecticide in 

 the dry or powder form. These were easily removed by the first 

 light rain. Furthermore, the method of growth and the smooth- 

 ness of the leaves of cabbage are such that not more than one- 

 tenth of the leaf surface is protected by such remedies. Another 

 factor has been that usually no effort is made to prevent the work 



