42 



i. One ounce evaporated in a greenhouse containing 1888 cu. 

 ft. of space. Time of exposure, 6 p. m. to 7.30 a. m. Plants treated : 

 Various — tomato, cucumber, Salvia, Lantana, heliotrope, geranium, 

 etc. Results: Plants uninjured ; a small percentage of larva? and 

 young pupa? killed ; adults appeared as though intoxicated, and in 

 the course of two days, a few, perhaps 5 or 10 per cent, recovered ; 

 the rest finally died. No live plant lice could be found, although 

 they became abundant again in the course of a few weeks, showing 

 that a few must have escaped. 



2. Rate: One ounce per 2000 cu. ft. of space. Time of ex- 

 posure, 6 p. m. to 7.30 a. m. Plant treated : Tomato. Results : 

 Plants uninjured ; adults stupified in a few minutes, but 75 per cent 

 fully recovered by the next morning ; larva? and pupas unaffected. 



3. Rate: Two ounces per 2000 cu. ft. of space. Time of 

 exposure, 3 hours. Plant treated: Tomato. Results: Plant un- 

 injured ; adults began to drop from leaves in about 3 minutes, and 

 in 10 minutes none showed signs of life ; 24 hours later, 50 per cent 

 of adults dead ; the remainder recovered. 



4. Rate: Two ounces per 2000 cu. ft. of space. Time of ex- 

 posure, 10 hours. Plant treated : Tomato. Results: Plant un- 

 injured ; adults killed ; a few larvae and young pupas kilied. 



5. Rate: One ounce per 2000 cu. ft. of space. Time of ex- 

 posure, 23 hours. Plant treated : Cucumber. Results : Tender 

 leaves killed ; all adult insects killed. 



6. Rate : Five ounces per 2000 cu. ft. of space. Time of ex- 

 posure, 7 p. M-. to 8 a. m. Plant treated : Tomato. Results : Plant 

 uninjured; all adults and about 50 per cent of larva? and young 

 pupa? killed ; eggs and nearly mature pupa? unaffected. 



7. Rate: Fifty ounces per 2000 cu. ft. of space. Time of 

 exposure : One hour. Plant treated : Tomato. Results : Plant 

 uninjured ; all adults killed ; larva? and pupa? unaffected. 



Buck's Best Brand Fumigating Compound, mnfg. by W. W. 

 Bush & Co., Ltd., London, England. Cost, $4.75 to $S.oo per lb., 

 according to amount purchased. Strength recommended, one ounce 

 to 2275 cu. ft. of space. 



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



