Whenever possible, consult an expert in plant disease diagnosis. This section is not intended to aid identification of cotton diseases, but is intended to be a rapidly accessible source of information on management techniques. The publication was made possible through the efforts of many people, including Joyce Elrod, senior research technician at the MU Delta Center. Small, light green to dark brown angular lesions on leaves. Large numbers of lesions may darken large areas of a leaf.
Infected leaves defoliate prematurely.
Most varieties have some resistance. Crop rotation will control this problem. Boll rots Ascochyta gossypii, Glomerella gossypii, Diplodia gossypina, Fusarium species, Phomopsis species, Phytophthora capsici, Xanthomonas campestris pv. None Prolonged periods of high humidity or water on the boll surface is necessary for infection. Rank growth promotes boll rot.