SUMMARY OF IXSECT CONDITIONS DURING 1921. 



21 



Table 4. — Monthly departures from normal temperature and rainfall from 

 September, 1920, to September, 1921, inclusive, in the region infested by the 

 pale western cutirorm. 



DEPARTURES 



(IN DEGREES 



FAHRENHEIT) 



FROM NORMAL 



TEMPERATURE. 





1920. 



1921. 





Sept. Oct. 



Nov. Dec. 



Jan. Feb. 



Mar. 



Apr. 



May. 



June. 



July. 



Aug. 



Sept. 



North Dakota 



Montana 



Wyoming 



Colorado 



+2.6 

 + -9 



- .1 



- .9 



+5.6 

 +1.6 



- .5 



- .7 



+ 1.4 

 -1.3 

 -3.7 

 -2.4 



+2.2 

 +2.5 

 + 1-4 

 -2.8 



+11.2+11.9 

 + 7.5+ 8.9 

 + 3.8+ 5.1 

 + 3.7+ 3.6 



+2.6 

 +2.7 

 +4.3 

 +4.9 



-0.6 

 -1.1 

 -2.6 

 -2.3 



+1-2 

 + -3 

 +1.0 

 + 1.5 



+5.5 

 +3.6 

 +3.3 

 + .5 



+3.9 

 +1.5 

 + 1.3 

 + -5 



+ 1.8 

 +1.8 

 + -8 

 - .1 



+0.6 

 -3.9 



- .7 

 +1.1 



Regional mean 



+ -6 



+ 1.5 



-1.5 



+ .8 + 6.5+ 7.4+3.6 -1.6 



+1.0 ,+3.2 



+1.8 1+1.1 



- .7 



DEPARTURES (IN INCHES) FROM NORMAL RAINFALL. 



North Dakota 



Montana - 



Wyoming - 



Colorado - 



- 



0.58 -0.48 -0.21i-0.22 -0.32 

 - .55+ .03- .51- .171- .31 



Regional mean — .14+ .03 



- .04 

 + .05 



-0.10 



- .30 



- .48 



- .47 



+0.17 

 + .41 



- .10 



.33 + 



+0.43-0.09+0.55+0.43 



.13 



.19 + 

 .72- 



.32 + .01 

 .06+ .36 

 .39+1.52 



+ -27 



+ .61 



+ .15 



-0.36 



- .63 



- .27 

 + 1.17 



- .02 



+1.66 



- .28 



- .77 



- .97 



- .09 



ALFALFA WEEVIL. 



(Phytonomus posticus Gyll.) 3 



Since its original discovery in this country in the spring of 1904, 

 the alfalfa weevil has continued to spread over the alfalfa-growing 

 sections of the Great Basin and Kocky Mountain States and into the 

 northern Pacific Coast States. 



The original infestation in Utah has now spread to cover the entire 

 northern two-thirds of the State, from Beaver County on the south- 

 west to Duchesne and Summit Counties on the northeast, thence 

 northwestward over the State, and into Idaho and Wyoming. 



In Idaho the infestation is now known to be present in 28 counties, 

 all in the southern part. Counties in which the weevil was dis- 

 covered for the first time are Twin Falls, Owyhee, Gooding, Custer, 

 Camas, Butte, and Blaine. The weevil was found in Owyhee County 

 in the extreme northwestern corner, where it occurs sparsely in 

 the Gem irrigation district. Weevils were abundant enough in the 

 Arco, Mackey, and Carey localities of Butte, Custer, and Blaine 

 Counties to be doing considerable damage. The infestation in Camas 

 County is light, increasing from Fairfield to the alfalfa fields farthest 

 east in the county. A single weevil was found in Gooding County 

 in the Hagerman Valley near the town of Hagerman. In Twin Falls 

 County the weevil was found to be present from about 3 miles west 

 of Murtaugh to the easternmost alfalfa fields in the county ; the in- 

 festation was light, however, and but little injury is anticipated in 

 the immediate future. In Clark County the infestation has spread 

 over all alfalfa sections. In the southeastern counties of Idaho the 



3 Reported by G. I. Reeves, of the Bureau of Entomology, and Claude Wakeland, of the 

 Idaho Extension Service. 



