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Minn. The Toxicity to European Corn Borer of Insecticides and an 



Interpretation of Their Penetration and Accumulation in Insect 

 Cuticle , To (1) explain differences in insecticidal efficiency 

 when applied at different temperatures, (2) explain certain 

 insecticide concentration-temperature relationships by comparing 

 ease of adsorption, (3) compare insecticidal efficiency on 

 European corn borer, particularly with materials less hazardous 

 than DDT, and (4) compare efficiency of different insecticidal 

 forms and application methods for European corn borer. 

 Ent. 1722 



Minn. Causes of Insect Outbreaks. 1. Factors Affecting Populations 



of European Corn Borer . To (1) make an annual census of borer 

 abundance together with measurements of major factors of weather 

 and biotic factors which affect borer abundance: (2) carry out 

 experimental work aimed at elucidating operation of weather, 

 biotic, agronomic, and soil factors on borer abundance; and (3) study 

 effect of plant characteristics such as development, genetic make-up 

 and physiotic conditions on the level of abundance of borers in the 

 corn plant. 



Ent., Agron., PI. Gen., Soil 1726 (NC-20) Coop. ARS 



Miss. The Genetic Improvement of Grain Sorghum for Production 



Under Humid Conditions . To develop superior varieties of grain 

 sorghum adapted to soil and climatic conditions of this state. 

 Agron. HC-5 



Miss. Control of Insects Affecting the production of Sorgo and 



Grain Sorghum Seed . To (1) evaluate damage done to heads of sorgo 

 and sorghum by each species of insect in various parts of the 

 state; (2) make seasonal history studies on species of insects, 

 needed to work out controls; (3) note relative rate of infestation 

 of various species on variation varieties and selections of sorgo 

 and sorghum in efforts to find plant material resistant to insects; 

 (4) study effect of agronomic practices which may lead to growing 

 sorghums with least insect injury to heads; and (5) conduct 

 toxicological studies to work out practical control of insects 

 after using best cultural methods. 

 Ent. HH-10 



Mo. Breeding Hybrid Corn for Missouri . To (1) develop agronom- 



ical! y superior hybrids, (2) develop hybrids for special purposes, 

 (3) conduct investigations in pathological, entomological, and 

 cultural problems, and in breeding techniques. 

 Field Crops 85 Coop. ARS 



