I II SECT PEST SURVEY BULLETIN 
"Vol. IS S-uppleraont to NuiilDer 6 Au^st I5, 193S 
Tr3 SPECIES AIID DISTRIBUTION OP rJAS SHOPPERS IN IKS 1937 OUIBREAK 
Ropert L. Shotv/ell, Entomologist 
The year 1937 v^as the fourth in which r^^'as shoppers were collected in 
typical environments in the several States includGd in the annual grasshopper 
survey. Data from the 193^, 1935. I936 colloction-r wore pulDlished as supple- 
ments to the Inr, oct ?c>st Survey Bulletin ac follows: Nos, 9 in volume lU, 5 in 
volume 16, and 3 in volume 17, respectively. 
The present report is "oased on data from collections made in IJ States, 
namely, Arkansas, Arizona, Colorado, lora, Kansas, Michigan, Minne'^. ota, Montana, 
Nehr-iska, Now Mexico, North Dakota, Oklahoma, South Dakota, Tex-is, Utah, Wisconsin 
and V/yoming. Those collections totaled 175,022 specimens. All were determined 
as to species or were classified undetermined as nymphs and other forms, and then 
counted. This rei^resonted nn immense amo'ont of work and should be credited to 
P. E. Skoog, field assistant, who had charge of the work of identification. 
In a task of such htige dimensions there are Dound to he weaknesses. The 
chief criticism has "been the fact that in some places -where several species 
occurred in large numbers whose seasonal histories do not coincide, collections 
made late in the sumrier do not show a representative naimber of the adults of the 
enrlier species. To bo more accurate in this respect, collections should be made 
several tines between July 1 and September 1, Another weakness has been the fact 
that a fe-" of th'j importajit species are more agile than are the collectors, 
Dissostcira lo ngipenn is Thos. docs not appear in the collections in numbers 
representative of its abundance in the arjas where it was the dominant species. 
Notwithstanding these weafciesses, it is believed that these data will hove their 
place in a study of the grasshopper popialatior.s. 
All of the 2h Stotes located west of ajid including Michigpji, Illinois, 
Missouri, Arkansas, and Terras experienced light to very severe infestations of 
grasshoppers ^diiring the su-j-er. The most severe mid widespread damage was done 
to small grains in eight coxmtios in the northetistcrn quarter of South D;,ikota and 
to crop and range gras-es in the entire southeastern quarter of Colorado, Severe 
damage was done to cotton in Texas and Oklahoma and spotted but severe injury 
occurred in corn, alfalfa, and small grains in other States. Over the entire area 
the total crop loss was estimated as being between one-half and one-third. of the 
loss ^ in 1936, Outside of this area, Indiana, Tennessee, Alabama, Mississippi, 
Plorida, and other States reported either increased nu.mbers of gras shopiDcrs or 
minor outb realms, ' " 
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