436 



THE GYPSY MOTH. 



No. 90. — June 29, 1894. Ten caterpillars, of the fourth 

 molt, were placed on elm leaves which had been sprayed 

 with Paris green, in the proportion of 6 lbs. to 150 gal. of 

 water. Four died the first, two the second, one the third, 

 fourth, fifth and sixth days. 



Check experiment : one died the third day. 



No. 91.— July 10, 1894. Ten caterpillars, of the fifth 

 molt, were placed on elm leaves which had been sprayed 

 with Paris green, in the proportion of 6 lbs. to 150 gal. of 

 water. Two died the third day ; one died and one pupated 

 the fourth day ; two died and one pupated the sixth day ; 

 two died the eighth and one the twelfth day. 



Check experiment : one pupated the fifth day ; one died 

 the seventh day ; two died and two pupated the eighth day ; 

 one pupated the ninth and one the tenth day. 



No. 92 (field experiment) .— July 7, 1894. Ten cater- 

 pillars, of the fifth molt, were placed on willow branches 

 which had been sprayed with Paris green, in the proportion 

 of 6 lbs. to 150 gal. of water. Two died the fourth, one 

 the sixth and one the seventh da}' ; one pupated the eighth 

 and one the thirteenth day ; one died the fourteenth day ; 

 one pupated the fifteenth, one the nhieteenth and one the 

 twentieth day. Foliage badly burned. 



Experiments with Paris Green and Lime. 

 i lb. Each of Paris Oreen and Lime to 150 gal. Water. 



No. 1. — April 26, 1894. Ten caterpillars, three days 

 old, were placed on lettuce leaves which had been treated 

 with Paris green and lime, in the proportion of J lb. each 

 to 150 gal. of water. One died the second and nine the 

 third day. 



Check experiment : none dead. 



No. 2. — May 9, 1894. Ten caterpillars, six days old, 

 were placed on lettuce leaves which had been treated with 

 Paris green and lime, in the proportion of J lb. each to 150 

 gal. of water. One died the second, one the third, seven 

 the fifth and one the sixth day. 



Check experiment : none dead. 



No. 3.— -May 28, 1894. Ten caterpillars, of the first 



