heavy infestations were present in portions of Park, Big Horn, Washakie, 
Sheridan, and Eremont Counties* 
1/ , . . 
Worth Dakota* (July 6 - 12 ): Throughout southeastern Worth Dakota, popula- 
tions remained light and no crop damage of any consequence wan 
reported* The grasshoppers remained along margins, except in a few 
instances, and the slight leaf damage which occurred was confined to 
a few yards into the fields* Approximately 20 percent were adults, 
except in northern Cass County and the sandy areas of Sargent County^ 
where from SO to 90 percent of M* hivittatus were adults* In north- 
central and northeastern Worth Dakota leaf damage was negligible and 
dispersal of M. hivittatus into fields, was only slight. Eungous 
disease was reported in Pembina, Damsey, and Walsh Counties; however, 
it amounted to less than 2 percent as a whole. Wo flights other than 
local movements and dispersion were reported in the State. (July 13-19 ) ’• 
Most damage in northeastern Worth Dakota occurred primarily in Pembina 
County; however, the damage amounted to less than 2 percent of the 
crops in the infested areas. Pields with heavy populations several 
wee ks ajo showed a dispersal averaging about 40 percent* 
South Dakota. (July 6-12): In northeastern and north-central South Dakota, 
grasshoppers were dispersing generally; however, flights appeared to 
be only of short duration and did not cover great distances. M. differ- 
ontialis in these areas ranged from third- to fifth-instar nymphs, 
while M. moxicnnus , M. hivittatus , M* po,ckard.ii , and. A. turnbullii 
were mainly adults. In central South Dakota, east of the Missouri 
Diver, pra.ctica.lly all M. hivittatus and M. mexi canus wore adults, 
while only 20 percent of M, diff orentialis had. reached that stage. 
Many M. hivittatus were ovipositing. Damage to small grain increased 
during the week in that section of the State, as a result of head 
clipping and shelling of ripe corn, which ha.d not been harvested. 
In the extreme southeastern counties a few adult M* diff erentialis 
were appearing, while from 75 to. 90 percent of M. hivittatus and 
M. mexicanus were adults. Over 75 percent of the small grain in 
that area had been harvested. In south-central South Dakota, 
M. hivittatus and M. mexicanus were practically all adults. Light 
flights occurred daily and populations in the M. bivit talus infested 
areas were materially reduced. Considerable damage occurred, hut did 
not exceed 10 percent. (July 13— 19)* Grasshoppers in general, with 
the exception of M. diff erentialis , were 90 percent adults and ovipositioi. 
by M. bivit talus was reported, M. diff orentialis wa.s predominantly 
in the fifth instar; however, the species wa.s rapidly becoming adult* 
In central and south-central South Dakota., M. mexicanus was supplanting 
M, hivittatus in various areas o.s the dominant species* East of the 
Missouri Diver, in southern South Dakota, and in the northern portion 
of the State, M. diff orentialis wa.s commonly dominant. Considerable 
head, clipping in wheal and barley fields occurred during the last 10 
days* Injury to small grains for the State a.s a whole was estimated 
at about 10 to 12 percent. Grealest injury occurred in the central 
areas. A general movement of gr o.s shoppers from stubble fields into 
corn and sorghum was in progress* Blights continued throughout the 
week with more grasshoppers in the a.ir than a.t any time previously 
in the season. 
