Extension Work in Plant Pathology, 1923 



(7) Insect eradication to prevent transmission of disease 



(8) Selection of seed free from disease. 



(9) Eradication of weeds and other plants thai might harbor 

 ►rganism. 



(10) Careful handling and practice of sanitation during harvest 



( 11 ► Proper storage and loading of <-ar<. 



the causal 



"While considerable time was given in some State- to survey and 

 eradication work in cooperation with the departmental and State 

 agencies engaged in programs for control of white-pine blister rust 

 and black stem rust of wheat, space does not permit a detailed dis- 

 cussion of the>e projects. Most of the extension effort was applied 



Fig. 6. — County agent, extension plant pathologist, and extension horticulturist 

 collecting the scab fungus on last year's apple ]rave<. By examining this material 

 under the microscope information i< obtained which helps to determine the proper 

 Time for spraying. 



to four activities — introduction of resistant varieties, seed disinfec- 

 tion, spraying, and seed selection — which are di-cussed somewhat in 

 detail in the following pages. 



PLANTING DISEASE-RESISTANT VARIETIES 



In the field of control by use of disease-resistant varieties, work 

 was reported in connection with the introduction of wilt-resistant 

 strains of tomato, cotton, and cabbage, rust-resistant asparagus, root- 

 rot resistant peas, root-rot resistant tobacco, and blight-resistant 



spinach. 



G. W. Fant. extension plant pathologist of North Carolina, gave 

 the following account of his work on cotton-wilt control: 



In order to reduce the loss resulting from cotton wilt, demonstrations were 

 arranged in the eastern portioo of the State to show the most efficient method 



