-36- 



Tex, The Relationship Among Insects. Insecticides. Weather and 



Host Plants in the Control of Field Crop Pests. With Special 

 Reference to Cotton . To determine (1) effect of wind, rain, 

 temperature, light, humidity, and dew, under controlled con- 

 ditions individually and in combination, on the toxicity of 

 various insecticides to specific insect pests; (2) effect of 

 age, size and condition of growth of host plant on the toxicity 

 of insecticides to plant pests; (3) speed of action of various 

 insecticides to certain pests; and (4) effect of dosages and 

 single and multiple applications on residual toxicity of in- 

 secticides. 



Ent. 933 Coop. ARS 



Tex. Treatment Schedules for Control of Insects Attacking Cotton . 



To determine most economical schedules of insecticidal applica- 

 tions for control of cotton insects. 

 Ent. 934 Coop. ARS 



Tex. The Seedling Disease Complex of Cotton , (l) Extend & inten- 



sify existing knowledge of occurrence & importance of fungal 

 pathogens of cotton seedling disease complex in terms of geo- 

 graphy & soil type. (2) Establish standard physiological re- 

 sponses for principal species of complex, as: cardinal temper- 

 atures, growth on standard artificial & synthetic media, growth 

 in soils of different levels of moisture & organic matter. (3) 

 Develop system of seedling disease grades reflecting relative 

 symptomatology on quantitative basis & adaptable to current 

 statistical methods. (4) Evaluate in terms of disease grades, 

 responses of major commercial varieties & representative gen- 

 etic types of cotton to seedling disease complex in soils at 

 controlled temperature levels. (5) Cooperate with existing 

 programs in selecting for tolerance of seedling diseases with- 

 in current material, or in adding tolerance by hybridization 

 & selection. (6) Examine prior treatment of seed, as to fuzzy, 

 reginned, acid-delinted or flamed, in light of possible pre- 

 disposition to seedling disease. (7) Evaluate selected chern^ 

 icals, applied to seed prior to planting or mixed in covering 

 soil, as means of controlling losses from seedling disease. 

 PI. Physiol., Agron. 990 Coop. ARS 



