43 



posure : 6 p. m. to 8 a. m. Plant treated : Tomato. Results : 

 Plant uninjured ; adults slightly disturbed. 



2. Rate: Two ounces to 2275 cu. ft. of space. Time, 3 

 hours. Plants treated : Tomato and geranium. Results : Plants 

 uninjured; adults began to drop from leaves in about 2 or j min- 

 utes ; in the course of 3 days, however, all but about 5 per cent fully 

 recovered. 



3. Rate: One ounce to 2275 cu. ft. of space. Time of ex- 

 posure, 22 hours. Plant: Tomato. Results: Plant uninjured; 

 a few adults showed signs of life when door of fumigating box was 

 opened, but at the end of the third day after fumigation all adults 

 were dead ; a few larvae and pupae killed. 



4. Rate: Two ounces to 2275 cu. ft. of space. Time of ex- 

 posure, 6 p. m. to 8 a. m. Plant treated : Tomato. Results : Plant 

 uninjured ; a few larvae and young pupae and 95 per cent of adults 

 killed. 



Thripscide, mnfg. by E. H. Hunt, 76 Wabash Ave., Chicago, 111. 

 Cost, 16^- to 25 cents per lb., according to amount purchased. 

 Strength recommended, One lb. for an ordinary 100 foot greenhouse 

 for' a light fumigation, or 5 lbs. for an ordinary 300 foot greenhouse 

 for a heavy fumigation. 



1. One-fourth lb. in a greenhouse 16 feet long containing 1700 

 cu. ft. of space. Time of exposure, 7 p. m. to 8 a. m. Plants : 

 Hibiscus and Eupatorium. Results: Plants uninjured; adult 

 Aleyrodes stupified, but all recovered ; apparently all plant lice 

 killed. 



Carbon Bisuljid. Ordinary commercial carbon bisulfid was 

 used in these experiments. This costs about 25 cents per lb. Furaa 

 Bisulfid is manufactured by E. R. Taylor, Penn Yan, N. Y., and 

 costs 10 cents per lb. 



1. Rate : One lb. per 1000 cu. ft. of space. CS 3 was poured 

 on to cotton in this and later experiments. Time of exposure, one 

 hour ; sun shining, 8.45 a. m. Plant treated : Tomato. Results : 

 Adults began to drop from leaves in about 25 minutes, and showed 

 but slight signs of life when fumigating box was opened ; all recov- 

 ered in course of 2 hours ; plant uninjured. 



