SUMMARY OF INSECT CO]SrDITIO:N'S DURING 1D21. 



15 



Table 2. — Monthly departures from normal temperature and rainfall for the 

 fall of 1920, the winter of 1920-21, and the groialng sea-^on of 1921 in the 

 region infested by the chinch bug during 1921. 



DEPARTURES (IN DEGREES FAHRENHEIT) FROM NORMAL TEMPERATURE. 





1920 



1921 



State. 



Sept. 



Oct. 



Not, 



I)ec. 



Jan. 



Feb. 



Mar. 



Apr. 



May. 



June. 



July. 



Aug. 



Sept. 



Michigan 



+2.4 



+2.2 



+3.1 



+1.4 



+ 1.4 



+.6 



+.8 



+ 1.6 



+2.6 



+.4 



+ 1.8 



+7.3 

 +5.9 

 +6.9 

 +4.2 

 +4.3 

 +3.8 

 +5.3 

 +5.9 

 +5.7 

 +2.1 

 + .5 



-0.5 

 —.5 



+.4 

 -1.4 

 -3.5 

 -4.4 

 -.8 

 -.8 

 -1.3 

 -4.2 



+4.3 

 +1.4 

 +2.5 

 +1.2 

 +2.6 

 +3.2 

 +2.9 

 +1.3 



+ 2.6 



+2.0 

 + .5 



+6.1' +7.5 

 + 10.51+12.4 

 + 10.5+10.5 



+6.9 

 +6.5 

 +9.5 

 +7.3 

 +8.5 

 +7.3 

 + 10.1 

 +10.1 

 +9.9 

 +4.7 

 +5.6 



+6.3 



+2.4 



+3.7 



+ l.i; 



+.9 



+.9 



+5.3 



+3.9 



+3.9 



-.7 



-1.8 



+3.6 

 +1.4 

 +2.8 

 +1.6 

 +2.0 

 +2.4 

 +1.3 



+6.1 

 +6.9 

 +5.6 

 +3.8 

 +3.4 

 + 1.6 

 +4.2 



+7.0 

 +3.8 

 +3.8 

 +1.8 

 +2.9 

 +1.1 

 +4.2 

 +5.1 

 +4.8 

 +.4 

 +.0 



+0.7 

 +.9 

 +.3 

 + 1.1 

 +.8 

 +1.4 

 -1.1 

 -.5 

 +.1 

 +2.1 

 +1.7 



+5 



South Dakota 



Iowa 



+1.0 

 +3.9 



Nebraska 



+ S.4 

 +7.2 

 +6.9 

 +4.7 

 +5.6 

 +7.8 

 + 5.7 

 +5.7 



+9.1 

 +9.1 

 +9.0 

 +6.4 

 +7.0 

 +8.7 

 +6.1 

 +3.6 



+2.7 



Missouri 



+4.7 



Kansas 



+4.6 



Ohio 



+4.6 



Indiana 



+2.1 



4-4.7 



+4.7 



Illinois 



+2.91 +5.2 



+4.6 



Oklahoma 



+2.5 

 +.6 



+.6 



-.8 



+ 5.0 



Texas 



+4.0 







Regional mean 



+1.6 



+4.7 



-1.8 



+2.2 



+7.2 



+8.1 



+7.8 



+2.3 



+2.1 



+3.6 



+3.2 



+.7 



+4.0 



DEPARTURES (IN INCHES) FROM NORMAL RAINFALL. 



Michigan 



South Dakota. 



Iowa 



Nebraska 



Missouri 



Kansas 



Ohio 



Indiana 



lUinois 



Oklahoma 



Texas 



-0.57 

 -.39 



-.06; 



-.93| 

 +.92| 

 +.22; 

 -.16 

 -.18 

 -.87 1 

 +.65! 

 -.65' 



-0.84 

 -.48 

 -.33 

 +.60 

 +.25 



+ 1.04 

 -.59 

 -.33 

 -.32 



+2.9: 



+ 1.20 



Regional mean 



I 



-.18 



-0. 24' 

 +.56 

 + 

 +.42 



-1. 

 +.19 

 +.30 



-1.04 



-1.44 

 -.29 

 +.27 



+ 1.25 



+ .02; 



-.06! 

 +.04 

 -.22 

 -.07' 

 -.57 1 

 +.531 

 +.65 

 +.47 

 -.66 



-1.18 

 -.20 

 -.54 

 +.18 

 -.38 

 +.37 

 -.69 

 -.74' 

 -.93 

 +.84: 

 +.04 



-0.77 

 -.41 



-.38| 



-.30 



-1.331 



-l.Olj 



-.58. 



-.92 



-1.26 



+.13 



-.29 



-.28 -.151 +.12 -.29: 



I 1 ! 



+1.61 



+.21 



-.20 



-.45 



+ 1.68 



+.06 



+2.471 



+2.0li 



+2. 10 



+ 1.05, 



+.82: 



+1.15 

 -.34 

 +.48 

 -.53 



+ 1.52 

 +.72 

 +.67 

 +.81 



+ 1.39 

 + .18 

 +. 



+.01 



-1.20 



1.31 



-.43 



-1.81 



-2.11 



2.84 



-1.74 



64+1.031 +.59'-l.: 



-L 48 -0.92 

 +. 02 -1. 59 

 -.34 -.62 

 -1.44 

 +1.15 

 +.81 

 -.93 

 -.33 



+4.24 

 +3.39 



-0.621 + 1.29 



+.76: +.52 



-1.43, + 1.36 



+.67: -.29 



-1.77+1.63 



-.37 +.28 



-1.03 +.71 



-1.27+2.09 



-1.57; + 1.81 



-.601-1.11 



-.42'-1.60 



-.69i + 1.02+l 



+0.73 

 +2.07 

 +3.36 



+.19 

 +3.15 



+.58 

 + 1.67 

 +2.58 

 +3. 10 



+ .01 

 + 1.20 



GREEN BUG. 

 (Toxoptera graminum Roncl.)^ 



The green bug was of comparatively little importance during the 

 season of 1921. Earl}^ in the season the pest appeared in rather 

 threatening numbers in parts of Texas, Oklahoma, and Kansas, but 

 drj^ weather later in the season reduced the injury to a negligible 

 factor. The areas from which reports of infestation were received 

 include a narrow .strip of territory extending from Bell and Coryell 

 Counties in Texas northward through Ellis, Denton, Collin, and 

 Grayson Counties, into Bryan County, Okla. Oats were seriously 

 injured in some of the northern counties of Texas where the loss 

 was estimated at about 25 per cent. Quite serious infestations were 

 also recorded from north-central Oklahoma, including Oklahoma, 

 Logan, Noble, and Tulsa Counties. (Fig. 4.) 



In Kansas the infestation was confined to the southeastern tier of 

 counties, being most severe in Cherokee County an! diminishing 

 westward to Cov/ley County. Sumner County was practically free 

 of the p-reen bug;. 



^ Drawn largely from the reports of .1. R. Horton, S. J. Hunter^ R. H. Beamer, .1. W. 

 McColloch, C. E. Sanborn, and B. E. Scholl. 



