SUMMARY OF INSECT CONDITIONS DURING 1921. 



25 



€rop in the infested territory during the season of 1919. Table (5 

 indicates the amount of sorghum and kafir corn forage harvested in 

 the five counties in Kansas during the season 1919 according to the 

 Fourteenth Census, and the number of bushels of sorghum seed 

 and kafir seed harvested from the same counties during 1919, and 

 the values of each, according to the figures given in the Twenty- 

 second Biennial Eeport of the State Board of Agriculture of Kansas. 

 According to these figures it will be seen that in the five infested 

 counties in Kansas over 121,000 tons of sorghum and kafir forage 

 were harvested in 1919, while approximately 963,000 bushels of seed 

 w0re harvested, valued at $1,289,000. By comparing these figures 

 with the census figures for Missouri and Arkansas it is seen that 



Fig. 11. — Geographical distribuiion of the sorghum webworm in the United States: 

 Shaded area, seriously infested in 1921 ; black dots, localities from literature. 



over 1.500.000 bushels of this seed were produced in the infested coun- 

 ties in the three States during 1919. The lowest estimated damage 

 in this territory amounted to 25 per cent of the seed. 



The map (Fig. 11) indicates the area infested this year (shaded) 

 and previous records of the occurrence of this insect (black dots). 



The temperature in the region infested by the sorghum webworm 

 was very uniform, the graphs of the three States showing marked 

 similarity. The temperature throughout the entire season was char- 

 acteristically above normal, the low temperatures of November being^ 

 the only exception. The winter was extremely mild, ranging about 

 4° or 5 C F. above normal, while the spring and summer were slightly 

 above normal. (See Fig. 12 and Table 7.) 

 111610—22 4 



