54 



MISCELLANEOUS RESULTS OF WORK OF BUREAU IX. 



Experiment No. 5. — May 22, at 6 p. m., fumigated a plant over- 

 night with one-half sheet of aphicide. There was a strong breeze. 

 May 23, the plant was uninjured. 





Adults. 



Pupae. 



Larvae. 



All forms. 



Dead 



6 

 2 



1 

 15 1 

 21 



31 

 11 



52 





34 









75 



m\ 



73.8 



60.4+ 





Experiment No. 6. — April 30, at 8.30 a. m., a plant was fumigated 

 with one sheet of aphis punk ( = 2 sheets of nico fume or aphicide) all 

 day; cloudy. Toward the end of the fumigation the punk began to 

 burn in strips, so it was not all consumed. It gave a very dense 

 smoke. The room was opened late in the afternoon. 



May 1, the plants were uninjured. 





Adults. 



Pupae. 



Larvae. 



All forms. 



Dead 



7 

 14 





 11 



3 



18 



10 





43 









33J 







14.2 



18.8 







Ma}^ 2, live thrips were abundant on the plants. 



Experiment No. 7. — April 30, fumigated with one-half sheet of aphis 

 punk (equal to 1 sheet of other kinds), but as it did not burn up, the 

 house was opened at 5.30 p. m. and a fresh piece put in. The fumi- 

 gation lasted all night. This piece also burned in strips and a third 

 was not consumed. 



May 1, the plants were uninjured. 





Adults. 



Pupae. 



Larvae. 



All forms. 



Dead... 





 11 



2 

 13 



3 

 15 



5 





39 













13| 



16| 



11+ 







It seems that the thrips that drop to the ground have a better 

 chance to recover than those on the plant. 



Experiment No. 8. — May 1, at 5.15 p. m., fumigated all night with 

 one-half sheet of aphis punk (fresh box from the factory) . This was 

 entirely consumed and the room well filled with smoke. 



May 2, the plants were uninjured; red spiders were alive. 





Adults. 



Pupae. 



Larvae. 



All forms. 



Dead 



68 

 4 



1 



24 



42 

 1 



Ill 





29 











94.4 



5 



97+ 



86.4 









