Common Diseases of Tomato and Their Control: Late Blight
Karen Meyers The fungus-like water mold, Phytophthora infestans, causes late blight in tomatoes and potatoes as well as in some other members of the nightshade family, Solonaceae. It appears first as dark…
Common Diseases of Corn and Their Control: Northern Corn Leaf Blight
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: Sooty Mold
This fungal disease appears as a black powdery coating on leaves and is caused by one of several different sac fungi (Ascomycetes), often Cladosporium and Alternaria. The appearance on corn…
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 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 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 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…
Common Diseases of Tomato and Their Control: Septoria Blight
Septoria blight is fungal disease caused by Septoria lycopersici and primarily affects tomatoes but can also infect other members of the nightshade family such as potato and eggplant. The main…