Found most often on: Crucifers, Grapes, and Vegetables
Symptoms: When dealing with Downey Mildew you will find visible discoloration on the surface of the plant fibers, often yellow that rapidly turns to brown. Leaves will appear extremely hydrated and wet, indicating mold. Soft rot usually results.
Found most often on: Most plants including ornamentals, vegetables, weeds, and fruit trees.
Symptoms: As the name suggests, powdery mildew appears as white or light gray powder over the plant’s surface (often leaves) area in the early stages. At later stages, you may see a more yellow or brown coloration. At the latest and most fatal stage, it will appear black. Retardation on blooming buds is common as is early leaf loss.
Found most often on: Melon, cucumbers, and gourds.
Symptoms: You may find small brownish spots with a yellow halo around the crown of the plant. The discoloration can spread rapidly, creating “targets” on the leaves. The leaves themselves can become dry and curled before dying completely.
Found most often on: Evergreen trees, shrubs, vegetables, ornamentals, and turf.
Symptoms: This overreaching term for various fungal diseases is often identified by discoloration of the plant’s tissue. Yellow, brown, and black spots can appear on leaves and twigs. In some trees, it may appear as lesions along leaf veins or cankers can sink areas of the tissue while swelling the outermost portion. Leaves can also curl or otherwise become disfigured. When near-fatal levels are reached, premature leaf dropping until complete defoliation is common.
Found most often on: The soil surrounding crops such as sweet potatoes, legumes, and bananas.
Symptoms: As a soil-dwelling fungus, this may infect the crops at any stage. In seedlings, it will cause quick wilting and death while in more established plants, it will turn leaves yellow with darker streaks in the vascular tissues. Root decay is common.
Found most often in: Cucurbit crops, squash, and pumpkin.
Symptoms. Wilting is the most identifiable symptom of this disease. Rotting of the root and crown should be obvious as well as rotting fruits at later stages. The infection causes blackening in the affected areas. Lesions will be brown and vary in the shade can be accompanied by white, powdery growths. When a plant has succumbed, it will collapse completely.
Found most often on: flowering plants and most crops
Symptoms: Pythium is unique in that it is much like fungus but has some differences. It lives in the soil and attacks roots. You can identify it early in its progression by dead-looking tips of the leaves. Later on, you may find water-soaked roots. The cortex of those roots should separate easily, leaving a stingy section behind. Rot may also be identifiable on stems when cut.
Found most often on: Ornamentals, ground crops, and more.
Symptoms: This quick-working fungi start at the stem and works its way up the plant. Stems become dry and brittle. Cankers are common and will appear rather large. Blight can accompany Rhizoctonia.
Found most often in vegetable plants, fruits, trees, shrubs, annuals, and perennials.
Symptoms: This disease can be difficult to identify. Leaves will wilt, curl, and become discolored. Yellow, or red spots may spread over the plant’s tissues. Once the disease has taken hold, leaves may turn dark brown and drop prematurely. On trees, you may see streaks under the bark and in shrubs, a similar sign on the stem.