Blight
Blight is a rapid and complete chlorosis, browning, then death of plant tissues such as leaves, branches, twigs, or floral organs. Accordingly, many diseases that primarily exhibit this symptom are called blights. Several notable examples are:
Potato
The historically significant "Phytophthora infestans" (late blight) remains an ongoing problem in Europe and the United States. Other potato diseases include "Rhizoctonia", "Sclerotinia", black leg, powdery mildew, powdery scab and leafroll virus.Insects that commonly transmit potato diseases or damage the plants include the Colorado potato beetle, the potato tuber moth, the green peach aphid ("Myzus persicae"), the potato aphid, beet leafhoppers, thrips, and mites. The potato cyst nematode is a microscopic worm that thrives on the roots, thus causing the potato plants to wilt. Since its eggs can survive in the soil for several years, crop rotation is recommended.