85 



Tree No. /j. — A thirteen-foot tree, with a six-inch trunk and 

 an eig-hteen-foot top; in fair condition, but badly infested by the 

 scale. This tree received no treatment with water until March 17, 

 when 15 g-allons were applied fourteen days after the application 

 of the insecticide. Tree No. 8 of Lot 1 is the companion tree. 

 Sixty-one per cent, of the scales on No. 15 were alive in the be- 

 g-inning; 87 per cent, of these were dead on the fifth day; and 98 

 per cent, on the twenty-second day. 



Tree No. i6. — A fifteen- foot tree, with an eig-ht-inch trunk and 

 a fifteen-foot top; in fair condition, but badly infested. This tree 

 received no water treatment until the fourteenth day, when thirty 

 gallons were applied. Forty-eight per cent, of the scales alive 

 March 4; 81 per cent, of these dead on the fifth day, 92 per cent, on 

 the twelfth, 95 per cent, on the twenty-second day, with a final 

 average of 99.6 per cent, destroyed by May 12. The corresponding 

 tree of the other lot is No. 9. August 20, one hundred scales ex- 

 amined; none alive. 



Ti'ee At?, i"/. — An eighteen-foot tree, with a nine-inch trunk 

 and an eighteen-foot top; in poor condition, and badly infested. A 

 check tree, receiving- no water treatment, the effect of the insecti- 

 cide being- consequently modified only by the three rains described. 

 Forty-one per cent, of the scales alive in the beginning; 68 percent, 

 of these dead in three days, 95 per cent, in twelve, and 99 per cent, 

 in twenty-two days. 



Fourth Lol oj Trees. Orei(oii Wash. 



This lot is essentially a duplicate of Lot 2 except with respect 

 to the insecticide treatment, which was identical with that of Lot 

 3, and also with respect to the number of trees made use of, which 

 was eight in this lot and nine in Lot 2. All variations of experi- 

 ments with Lot 2 are represented in Lot 4 with the exception of 

 that for No. 29. 



7Vee No. i8. — A sixteen-foot apple-tree, with a nine-inch trunk 

 and a twenty-foot top; in fair g-eneral condition, but badly infested 

 by the scale. Treated, like No. 4 of Lot 2, with a single applica- 

 tion of fifteen gallons of water on the second day after the experi- 

 ment, coinciding with the first shower of rain. Forty-seven per 

 cent, of the scales alive when the insecticide was applied; 15 per 

 cent, of these dead on the second day, 83 per cent, on the fifth, and 

 87 per cent, on the twentieth day. By May 12, 98.3 per cent, of 

 the scales on this tree had been killed. August 20, two hundred 

 scales examined; none alive. 



