THE GREENHOUSE THPJPS. 



Result of the fumigation, counting the thrips on the plant: 



53 





Adults. 



Pupae. 



Larvae. 



AU forms. 



Dead 



109 

 10 



30 

 26 



436 

 10 



575 



Alive 



46 









91.6 



53 



97.6 



92+ 







May 2, the plant was in fine condition and uninjured. About 10 

 live adults remained. Xo live larvae were seen, but the leaves were 

 covered with hundreds of dead ones. 



Experiment No. 2. — May 16, at 5.45 p. m., a plant was fumigated 

 overnight with one-half sheet of nico-fume paper. At 5.45 p. m. it 

 was dark from rain clouds. 



May 17, the plant was uninjured. Red spiders and mealy bugs 

 were alive. Few thrips were on the plant. 





Adults. 



Pupae. 



Larvae. 



All forms. 



Dead 



2 

 



5 



13 ' 



10 

 



17 



Alive 



13 







Per cent killed 



100 



27+ 



100 



"6 2 





3 



Experiment No. 3. — April 28, at 5.15 p. m., fumigated a plant over- 

 night with one sheet of aphicide. The sky was cloudy and there was 

 a strong breeze. The plant had a few thrips on it. 



April 29, when examined at 8.45 a. m., the plant was uninjured. 



Adults. 



Pupae. 



Lan 



se. 



All forms. 



Dead 



• 30 



1 

 



6 

 2 



37 



Alive 



3 









Per cent killed 



1 on 



100 





75 



S8+ 



" 1 



May 2, the plant was in fine condition. 



Experiment No. 4— May 24, at 7 p. m., fumigated a plant with one 

 shoot of aphicide. There was a strong breeze. 

 May 25, the plant was uninjured. 





Adults. 



Pupse. 





All forms. 



Dead 



3 

 



10 

 2 



67 







B 

 2 



Aliv,. 





l'«r .cut killed 



100 



83$ 



100 



97+ 





