Common Diseases of Corn and Their Control: Northern Corn Leaf Blight
Karen Meyers Northern corn leaf blight is caused by the fungus Exserohilum turcicum, and first appears on the lower blades at the time of silking or at full maturity It is characterized…
Common Diseases of Corn and their Control: Stewart’s Wilt
Caused by the bacterium, Pantoea stewartii, Stewart’s wilt has two phases. The first affects seedlings that may develop linear pale green to yellow streaks, wilt and dry up. The second…
Common Diseases of Cucumber and Their Control: Angular Leaf Spot ( Pseudomonas syringae pv. lachrymans)
Karen Angular leaf spot is a bacterial disease affecting cucumber and other cucurbits, including squash, pumpkin, and melon. The infection begins with small, angular, brown to straw-colored water soaked spots on…
Common Diseases of Corn and Their Control: Rust
The most common corn rust is caused by the fungus Puccinia sorghi and usually appears after tasseling as dark, reddish-brown pustules on the upper and lower surfaces of the leaves.…
Common Diseases of Corn and Their Control: Gray Leaf Spot
Gray leaf spot is one of two common foliar fungal diseases of corn. It is caused by either Cercospora zeae-maydis or Cercospora zeina and appears as grey rectangular, brown to…
Common Diseases of Cucumber and Their Control: Bacterial Wilt
Caused by the bacterium, Erwinia tracheiphila, bacterial wilt affects cucumber and cantaloupe severely, squash and pumpkin less so, and watermelon rarely. The first symptom is the wilting of leaves during…
Common Diseases of Tomato and Their Control: Early Blight
Early blight of tomato is a fungus disease usually caused by Alternaria solani or the more virulent A. tomatophila, and can also effect potatoes, peppers and other members of the…
Common Diseases of Cucumber and Their Control: Anthracnose
Anthracnose is a fungal disease caused by Colletotrichum obiculare and affects certain cucurbits, including watermelon, squash, pumpkin, and cantaloupe melon as well as cucumber. Symptoms appear in mid to late…
Common Diseases of Tomato and Their Control: Southern Bacterial Wilt
Southern bacterial wilt of tomato is a soil-borne disease caused by the bacterium, Ralstonia solanacearum. It also affects many other plants in the nightshade family (Solanaceae), including potato, eggplant, pepper,…
Common Diseases of Tomato and Their Control: Anthracnose
Anthracnose is a fungal disease that affects tomato and potato as well as plants in several other plant families including cucumber, onion and bean. The pathogen specific to tomato, Colletotrichum…