-231- 
Populations were very light and ’mostly along alfalfa field margins* 
Dominant species in the ea.st-central portion of thp State is M, ~bivitta,tus > 
v;ith a few M, f emur-ruhr’um present. Marginal populations as high as 
50 to 75 pel’ square yard were noted during the last week. 
1/ ' 
Minnesota. (June S-l4): Hea’vj^ r.ains occurred throughout the northwestern 
portion of the State and grasshoppers wore somcwhr,.t retarded in the 
rcute of development during the week. The heojvj M# hivittatus popula,tions 
in this area are now 25 percent third instar and JO percent fourth. 
There apparently was no largo reduction in nymphal populations heca-uso 
of the hea’vy rains* ■ Dissost eira Carolina L. v;as reported hatching in 
considerahle numhors on June 13* lu southwestern Minnesota, the ha.tch 
of M, differential is ,, the dominant species, is approzima.tely 60 percent 
complete, while t.hat of M. hivittatus is a.hout 90 percent complete. 
Ha.t'ching of M, f emu^ruhrum is just heginning, 
Morth Dakota. (J’une S-l4): Popula,tions in northeastern North Dakota 
continued to develops however, the rate of development was somev/hat 
retarded. The major M. hivittatus populations in this area, are now 
25 percent third— and JO percent fourth— instar nymphs. In northvrestern 
North Dakota hatching and nymphal development also v/as retarded and, 
for the area as a whole, the hatch of M, mex i canus is not over 25 
percent complete while M, hivitta.tus is approximately 45 percent complete, 
J, A. Munro (June 23); Pop’ulations of 4o to 50 grasshoppers per 
square yard were commonly ohsorvod along roadsides a.nd in pasture lands 
in Pemhina and Walsh Counties, more than SO percent being M, hivittatus . 
Less than 1 percent ha,d reached the adult sta-ge on Juno 21, Hoppers 
wore scarce at Langdon, 
1/, 
South Dakota. (June 3-14); Cool, cloud;,'', and rainy weather 'preva.iled the 
entire week throughout much of South Dakota and nymphs developed hut 
little. In the counties of central South Dakota, east of the Misso-uri 
Hiver, hatching is ijra.ctically complete, with the exception of possibly 
a fei^r M, diff erentialis . Most M, mexicanus and M, hivittatus are in the 
fourth and fifth ins-fcars. diff erentialis nymphs are mainly second 
and third instars. Economic populations are verjA siDotted, Grasshoppers 
have moved into small— grain fields to some extent; hov/ever, the heavier 
concentrations remain along field -margins. In the more severely 
infested areas, marginal pop'olations average ali) out I5O per square yard; 
M, hivittatus is the dominant species. 
17 
Wyoming, (June &-l4) ! A threatening infesta.tion is reported 13 miles north of 
Hiverton in Premont County, covering an- area a.pproximately 10 miles 
long and 3 miles wide, M, hivittatus is the dominant species. Infesta- 
tions are confined largely to field margins and very little crop damage 
has occurred to date, Thrca,toning infestations also are present north 
of Worland, in Washaltie County, 
B. T. Snipes (June 2l); M, hivitta.’tus and M. f emur-ruhrimn v/ere 
present in considerable numbers in Sheridan, Big Horn, Park, Hot Springs, 
and Washakie Counties, and in parts of Premont County, In Park County 
they range from 5 to I50 per squa.re yard 'in margins and from 1 to I50 
library 
STATS PLANT 
