-4o6~ 
1 1 . . 
Minnesota. (June 29-July 5) : Grasshopper development was somewhat 
retarded in northwestern Minnesota during the past week, owing to 
cool temperatures. Between 4(3 and 50 percent of M. hivittatus 
were adult, with 50 percent fifth instar. M. hivittatus was mating 
and 1 percent of the females contained eggs which were 75 percent 
developed. From 50 to 60 percent of the l hoppers in western Kittson 
and western Marshall Counties were found to he pere,sitizcd by nema- 
todes. further movement into small grains was apparent and 50 -pcrcciit 
leaf damage was noted; the average, however, probably did not exceed 
15 percent. In central Minnesota no infestations of economic importance 
were reported.- M. f emur-rubrum , the dominant species in most aroa,s 
of that section, wa.s primarily in the second instar. The hatch of 
M. diff orentialis and M. bivitta,tus in southwestern Minnesota was 
nearly complete. M. diff erentialis v/as the dominant species with 
the majority second-, third-, and fourth-instar nymphs. (July 13-19)* 
M. femur-rub rum was reported to be showing a decided incrca.se in- 
numbers over 19^0 in the southwestern portion of the .State, where 
approximately 50 percent of M. hivittatus v/ere adults. M. diff erentialis 
had not yet reached the adult stage. As grain wa.s harvested the grass- 
hoppers rapidly moved into corn and barley fields. In northwestern 
Minnesota flights of M. hivittatus ,. M. mexicanus , and _C. pellucida 
occurred daily and oviposition of M. bivittaatus vra s increasing. 
■il " 
Iowa, (July 6-12)l Several counties in the western part of the State wore 
reported to have heavy .populations of M 0 hivittatus and M. mexicanus 
in about equal numbers in local areas; a large part of the population 
v/as confined to heavy stands of sweetclover and alfalfa and little 
damage is evident. Heaviest concentrations v/ere reported in Monona 
and Harrison Counties. . 
Missouri. L. Haseman (July 28): Numbers through central and southern 
Missouri hECT^ continued light, except on scattered farms. M. hivittatus 
has been mating and ovipositing since July 10, and by July 20 limited 
numbers of M. diff erentialis v/ere approaching maturity. 
Arkansas. B. M. Gaddis (June 22—28): Infestations in northeastern Arkansas 
v/ere reported to be spotted but extremely heavy in localized areas. 
M. differentialis is the dominant species. 
~ V 
Wi sconsin. (Juno 22—28) : Throughout southern Wisconsin, the dominant 
species is M. hivittatus , of which the greater number were fourth- 
and fifth-instar nymphs. In the northwestern portion of the State, 
where grasshoppers have been numerous in past years, the numbers 
are reported to be quite small. (July 6-12): In central Wisconsin 
many grasshoppers v/ere reaching the adult stage; hov/ever, in some areas 
hatching v/as just beginning and in other areas first-, second-, and 
third- instar nymphs of M. femur-rubrum predominated. 
1/ 
Michigan. (July 6-12): M. mexicanus remained the dominant species in 
the northern half of the Lower Peninsula of Michigan, with Agcneo- 
tettix dcorum Scudd. second in economic importance. _C. pellucida 
and M, hivittatus seldom exceeded 5 percent of the populations. 
