New Yokk Agricultural Experiment Station. 399 



field and placed upon the sprayed lettuce. The next day very 

 few of the worms were found dead. Most of them had crawled 

 away and were spinning cocoons. Wherever the resin lime mix- 

 ture caused the leaves to stick together the plants were injured. 



A second lot of lettuce was sprayed with resin lime mixture and 

 Paris green on November 3, using same strength as before. 

 Smaller specimens of the looper were placed upon the sprayed 

 plants. Fifteen out of the 17 placed upon the plants were 

 found dead the next day. The leaves of the plants were injured 

 quite badly by the mixture. 



On December 14, two varieties of lettuce (Rawson Hothouse and 

 White Cos), plants 1-3 grown, were sprayed with the resin lime 

 mixture, using resin mixture at the rate of 1 gallon, water 32 

 gallons, bulk of lime 6 gallons and Paris green 1-1 pound. 

 This treatment destroyed all the loopers 16 on treated plants; but 

 at the same time it slightly injured the plants where the leaves 

 were gummed together. 



February 24, 1898, two varieties of lettuce were sprayed with 

 the resin lime mixture, the following proportions being used: 

 Resin mixture 1 gallon, water 64 gallons, milk of lime 8 gallons, 

 Paris green 1-2 pound. On March 2, this lettuce was found not in- 

 jured in the least by the mixture, and no live loopers were found 

 on the sprayed plants. 



COST OF SPRAYING. 

 From the tests made in 1896 on cabbage it was estimated that 

 1 man could prepare the resin lime mixture and spray 2 acres 

 a day with a knapsack sprayer. It was also estimated that 40 

 gallons would spray 1 acre. The above estimate is based on the 

 assumption that a good supply of the stock solution of the resin 

 mixture is prepared beforehand, and that the cabbage is two- 

 thirds grown. Nearly double this amount of small cabbage can be 



16 At the time of spraying, December 14 and February 24, the loopers were 



breeding in the forcing house. 



