CORN CRANBERR T 269 



Control. Destroy old infected ears and stalks. Practice a 

 rotation which will exclude corn for two years from or near the 

 given plat of ground. 



RUST (Puccinia maydis). Reddish pustules on the blades. Com- 

 mon on some varieties of sweet corn. 



Control No satisfactory method of control is known. 

 SMUT ( Ustilago zece). Attacks stalks, ears, and tassels, produc- 

 ing abnormal boils or outgrowths. Will infect at actively growing 

 points at any time. 



Control. Rotate crops. Do not manure com ground. Cut 

 out smut and burn it. Soaking seed is of no avail. 

 Cotton. ANTHRACNOSE (Colletotrichum gossypii). Forms black or 

 purplish colored spots on bolls. Disease also occurs on seed leaves 

 and on the leaves and stems. Select seed from fields free from the 

 disease. Rotate crops. Use disease-resistant varieties. 

 ROOT-ROT (Ozonium omnivorum). Easily recognized by the sudden 

 wilting and dying of the plants in the field. 



Control A combination of rotation of crops and deep fall 

 plowing is effective. 



WILT (Fusarium vasinfecta). Causes a gradual wilt and eventual 

 death of leaves and stems. 



Control Rotate crops. Secure seed of wilt-resistant varieties 

 of cotton. 



Cranberry. BLAST or SCALD (Guignardia vaccinii). The fungus 

 causes a blast of the flowers and very young fruits, and attacks 

 older fruits, causing them to appear scalded or watery. 



Control Spray five or six times with bordeaux mixture, 

 5-5-50, to which has been added 4 pounds of resin fish oil soap, mak- 

 ing the first application just before the blossoms open. Long 

 lines of hose are most satisfactory for this work, and the spraying 

 must be done thoroughly. 



ROT. (Acanthorhynchus vaccinii). A disease which cannot be dis- 

 tinguished from scald with the naked eye. 



Control As for SCALD. 



HYPERTROPHY (Exobasidium oxy cocci). Appears on the young 

 leaves soon after the water has been let off in the spring. The 

 axillary leaf buds are attacked and produce short shoots with 

 rather close, enlarged, swollen, and distorted leaves which are 



