-38- 



Wash, The Ecology of Insects and Mites on Alfalfa . To 



learn~~(l) reasons for increases in population of certain 

 insects and mites on alfalfa following insecticide 

 applications; (2) relationship among insect parasites and 

 hosts, and insect and mite predators that prey on alfalfa 

 under natural conditions and as affected "by insecticides. 

 Eat. 1283 (W-ltf) 



W. Va. Maintaining Profitable Stands of Alfalfa . To 



(l) evaluate soil conditions and disease and insect damage 

 on established fields of alfalfa and relation to yield and 

 longevity of stand; (2) determine effect of placement and 

 amount of nutrient elements on establishment, yield, and 

 longevity of alfalfa stands; and (3) determine effect of 

 soil fungicides and insecticides on establishment, yields, 

 and longevity of alfalfa stands. 

 Agron., PI. Path. 50 



W. Va. The Cause of and Remedy for Red Clover Failures in 



West Virginia . To (1) determine cause of failures of red 

 clover hay and seed crops and devise remedies, and (2) 

 investigate factors found primarily responsible for these 

 crop failures. 



PI. Path., Agron. 51 Coop. ARS 



Wyo. Economic Importance and Control of Alfalfa Insect 



.Pests. Alfalfa Weevil . To (1) determine how many 

 successive years of treatment with an approved insecticide 

 are necessary to bring an infestation below economically 

 injurious numbers; (2) determine how many years a controlled 

 infestation will take to reach once again an economic level; 

 and (3) compare the effectiveness of heptachlor and 

 dieldrin as an alfalfa weevilcide. Army cutworm . To (l) 

 determine the nature and extent of injury to alfalfa by army 

 cutworms; and (2) find an insecticide or conbination of 

 insecticides that will control effectively and economically 

 both alfalfa weevil and army cutworm. Pea aphid . To (l) 

 determine the density of pea aphids in alfalfa throughout the 

 season; and (2) determine the nature and extent of injury 

 caused by the pea aphid to alfalfa. 

 Ent., Parasitol. 565 



