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IX. Regional Research 



NC-20 Factors Influencing Corn Borer Populations . To 



measure seasonal changes in abundance of the European 

 Corn Borer under cropping procedures practiced in the 

 North Central States Region. To study the effect of 

 time of planting, strain resistance or susceptibility, 

 weather conditions, and character of plant growth on corn 

 borer populations and the impact of these populations on 

 corn yields. To accumulate and evaluate information on 

 other biotic and physical factors that influence corn 

 borer abundance. 



Cooperating stations and agencies: Iowa II, 

 Kans.H, Mo.,H, Minn. EC, Nebr. II, Ohio H, S. Dak. H* 

 ARS 



NC-29 Migration of the Potato Leaf hopper and its Causes . 



The potato leafhopper is an economically important insect 

 possessing migratory habits typical of certain other 

 destructive crop pests. The object of these studies is to 

 determine the source, path and periodicities of migration 

 of the leafhopper and its association with various 

 ecological influences. The determination of the causes 

 contributing to this insect's activity will supply useful 

 information in predicting insect appearance and abundance 

 and thus permit the development of more effective control 

 measures. 



Cooperating stations and agencies: 111. I, Minn. I, 

 Wis. I ARS 



S-l Genetics and Cytology of Cotton . 1. To accumulate, 



maintain, evaluate and utilize cotton species, interspecific 

 hybrids, races and genetic types. 2. To produce inter- 

 specific hybrids and study their cytological and 

 cytogenetic behavior. 3« To study the inheritance of 

 quantitative and qualitative characters, including 

 resistance to insects and other pests. 



Cooperating stations and agencies: Ariz. Ill, 

 Miss. IH, Tex. HI, ARS (See S-l in Part 8, Section B 

 for cooperators not doing research in entomology.) 



The Roman numeral refers to the location in the summary of the 

 contributing project title and objectives. 



