Archives: Diseases

Causes infections that are found on the plant tissues that have been weakened, invaded or killed by pathogens or by mechanical means. Soft rot in tubers is favored by immaturity, wounding, invasion by other pathogens, warm tuber and storage temperatures, standing water and low or no oxygen.

Coryneum blight also called Shot hole diease affects peaches, apricots and sweet cherries and other fruit trees. Some flowering ornamental trees can be affected as well. Since little can be done to control shot hole fungus once the trees have been infected, prevention is essential in treating shot hole disease Disease takes place in spring … Read more

This fungus survives the dormant season in the infected leaves and twigs. Black fruiting structures develop in leaves from the previous season during late winter and early spring. Release of spores occurs during wet periods in the spring and they infect young leaves, shoots, and fruit. One to three weeks after infection velvet-like, dark-green fruiting … Read more

Most of the fungi known as “rust” attack ornamentals. Each is specific to a certain type of plant, although some cedar apple rust, for example, require two hosts. The spores are spread by wind and splashing water.

While most fungi thrive in moist surroundings, the organisms causing powdery mildew flourish in dry conditions; they also prefer warm days, cool nights, and shade. The various members of the group attack different hosts and survive from year to year on perennial plants.

Mummies are just the beginning of infection. The mummies are only part of what takes place. The fungus overwinters in these infected berries that have fallen to the ground. In the spring, these mummies ‘sprout’ small, mushroom looking structures, with little cups on the end. These are called apothecia, and they produce tons of spores. … Read more

This virus infects more than 150 types of plants, including many fruits, vegetables, and flowers. It is characterized by leaves mottled with yellow, white, and light and dark green spots or streaks. Some of the most commonly infected plants include tomatoes, potatoes, squash, and cucumbers. But will infect others. Depending on environmental conditions, mosaic symptoms … Read more

Leaf Spot is a common descriptive term applied to a number of diseases affecting the foliage of ornamental and shade trees. The majority of the leaf spots are caused by a variety of fungal pathogens but some are caused by bacteria. Anthracnose is a term for a group of loosely related fungal diseases that often … Read more

The characteristic black spots on infected leaves are patches of fungus, not dead tissue. The organism attacks only roses; it survives on canes and fallen leaves, then spreads easily during misty, foggy, or rainy weather. Black spot is common in regions where summer weather is warm and humid.

The gray mold that afflicts garden plants is the very same organism you’ll often see on elderly boxed strawberries at the supermarket. Also known as botrytis blight, the disease is caused by a fungus that thrives in shady conditions and crowded plantings; it’s especially common in cool, humid climates. The spores are spread by wind … Read more