THE GREENHOUSE THRIPS. 

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



53 



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

 live adults remained. No live larvae were seen, but the leaves were 

 covered with hundreds of dead ones. 



Experiment A^o. 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. 



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. 



May 2, the plant was in fine condition. 



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

 sheet of aphicide. There was a strong breeze. 

 May 25, the plant was uninjured. 



