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_ I _ _ V _ appear attack bacteria bacterium breathing pores Brown canker caused by fungi cells chlorophyll COLLEGE OF TEXAS CONTROLLING PLANT DISEASES cotton root rot Crop Rotation crops Cross section Crown gall Dead areas develop disease symptom disease-resistant feeding figure fire blight flowers fruit fungal fungicides fungus germinate growing growth host plant infected plant infection element kill leaves turn Legume lesions limb living plants METHODS OF CONTROLLING Nonparasitic Diseases NUTRIENT DEFICIENCY organic matter ornamental plants parasitic Peach leaf curl phloem Photosynthesis plant disease organisms plant parasitic plant residue plant tissue Plants affected potato prevent pruning pustules Root knot nematodes rust Seed treatment seedling disease soft rot soil spores spots produced sprays stem stomata stunted surface of leaves susceptible SYMPTOM TYPES PRODUCED TEXAS AGRICULTURAL EXTENSION tobacco mosaic virus trees Viruses wheat wilt xylem young seedlings