SUMMARY OF INSECT CONDITIONS DURING 1921. 



27 











S//&&06//?/ 



































































































































r V - 























^ 

















































+<5 



+2 

 + / 



I 



NORMA L\ 

 -I fo 



-2 

 -3 



/&2/ 



/179AA&9& 





\ \ 



/S20 





+ 2 



NOft/ltiL 



-2 

 -3 











/?/?/frtA/&/< : ?& 

























































































































































































/32C 



/&2/ 



+ <5 



+ <?■ 

 + i3 



NOfiMAlS 

 ft 



-2 



Fig. 13. — Monthly departures from normal rainfall for the fall of 1920, the winter of 

 1920-21, and the growing season of 1921 in the region infested by the sorghum web- 

 worm during 1921. (See also Table 7.) 



