- 2k - 



H# Mex. The Occurrence of Beneficial Insects as Related to 

 Insecticidal Control Programs for Hemipterous Insect 

 Pests of Cotton" To determine (1) occurrence and 

 abundance of "beneficial insects in cotton fields; (2) rela- 

 tive importance of species found in terms of predatory or 

 parasitic preference for hemipterous insects injurious to 

 cotton, and (3) effect of chlorinated hydrocarbon type 

 insecticides on beneficial insects when applied as 

 control of harmful hemipterous species. 

 Biol., Eat. 5k 



N. C. The Control of Cotton Insects in North Carolina . To 



(1) determine through field experiments, best available 

 chemical and cultural control for important cotton insects, 

 including boll weevil, boll worms, thrips, mites and aphids; 



(2) Conduct laboratory screening tests on these pests using 

 new candidate insecticides to find new and better materials 

 for control; (3) study possible correlation between climatic 

 conditions and cotton pest incidence; and (k) determine 

 effects of insecticide residues occurring in the soil as a 

 result of chemical control of cotton insects on crops 

 subsequently grown on same land. 



Ent. 14-3 



N. C. An An alysis of _ Preference E xhibited by Boll Weevils 



for Cert ain_ Varie ta l Characteristics of Co tt on, and an Eval u- 

 ation of the Possibili ty of Breeding for Resistance to Bo ll 

 WeeyiljAntnonomus Grandis Boh), (lj Assemble a collection 

 of simply inherited, morphological and physiological varients 

 in cotton deterrent to boll weevil. (2) Test if weevils 

 exhibit preferences when offered choice of hosts in 

 replicated tests. (3) Combine into 1 strain all variant 

 physiological and morphological characteristics weevil has 

 exhibited a negative preference for. (k) Learn if true 

 resistance can be built up from combination of negative 

 preferences. (5) Study nature of any preferences established. 

 (6) Study magnitude and nature of any harmful effects on fiber 

 or yield associated with variants of investigation. (7) Eval- 

 uate possibility of introducing an economic degree of weevil 

 resistance into cotton by genetic means. 

 Gen. 73 



S. C. Causes_ of Non-Fluffed Looks in_Cotton and_JTheir Effect 



on Yield^ Quality_, Mechanical Harvesting_and Ginning. Learn 

 (lT influence of insects and insecticides; fungi and bacteria; 

 defoliants and defoliation; soil temperature, atmospheric 

 temperature, and soil moisture on occurrence of non-fluffed 

 locks; (2) influence of non- fluffed locks on mechanical picker 

 performance; ginning; lint fiber qualities; seed quality and 

 germination; yield of seed cotton, seed and lint. 

 Agrc Engin. 395 Coop. ARS 



