IOWA 
This is the fifth year in which collections have heen made in Iowa 
during the adult grasshopper survey. In this 1939 survey 2,577 specimens 
were collected in 7 major environments, with 24 species represented in the 
collections. The dominant species in the collections from 5 out of 7 
habitats was Melanoplus femur-ruprum , with M. mexicanus second in numbers. 
Nymphs, probably M. femur- rub rum , were numerous. M. .different! alls was 
dominant in corn and sor^um; M. mexicanus in red clover. The order of 
Importance based on numbers was the same as in 1938 for the 5 hipest 
ranking species. Collections were made so late in the summer that many 
M. bivittatus adxolts were probably missed, as this species finished its 
life cycle early. 
Only 17 counties, in the west-central and north-western parts, out 
of the 99 counties in the State, may need some control work in 1940. The 
most severe infestations are along field margins, and considerable damage 
to crops was noted in the adult survey. The normally heavy rainfall, how- 
ever, acts as a decided check on the development of infestations in this 
State and only drought brings on grasshopper trouble. 
