Powdery mildew is easily identified once the leaves develop a white powdery substance on the surface. Powdery Mildew can affect a wide range of plants, from fruit trees, bushes, lawns, annual and perennial flowers, to roses. It is a white, powdery fungi that thrives best during very warm, humid conditions. Unchecked it will quickly begin to turn leaves yellow, eventually causing them to drop. With a severe infestation the entire plant may suffer, or even die. To help control powdery mildew apply Wilson® Insecticide-Fungicide Garden Doctor® or Green Earth® Garden Fungicide and repeat at 7-10 day intervals as necessary.
Anthracnose is easily identified by the dark, sunken lesions that develop on the leaves, flowers, fruits, or stems. This fungal disease can affects many plants, including vegetables, fruits, shrubs and trees. It generally spreads during humid rainy seasons. For trees and shrubs make sure all infect leaves are cleaned up in the fall, and once the plant is dormant, thin the branches to increase the air flow, reducing ideal conditions for a repeat infestation next year. To help stop re-infestations in the growing season set up a spray regime with a recommend fungicide for the plant variety you have. Repeat treatments every few weeks to keep the disease at bay. Also applying a Green Earth® Dormant Spray Kit in early spring will give you a fresh start every year.
Round, black spots begin to appear on the upper leaf surface during spring and early summer. Leaves may turn yellow and drop prematurely. Flowering potential is reduced and severely affected plants may lose all leaves by midsummer. This fungi can be a severe problem in areas where high humidity is common. If left unchecked plants are often killed by repeat infestations. Beginning in the early spring set up a treatment regime using an approved fungicide for the plant you have. To help prevent be sure to apply a Green Earth® Dormant Spray Kit in early spring before the buds break open to control the over-wintering disease.
Rust is a fungal infection, where orange fungal spores are spread by the wind. It develops on the underside of the leaf, creating a yellow spot directly above, on the upper side. The undersides spots or blotches will contain red, orange or black powdery material that is easily scraped off. The leaves will become twisted, brittle, and perhaps will drop off. Rust disease thrives when moisture is present and temperatures are moderate. Spores overwinter on fallen dead leaves, so ensure all leaf trash from last fall has been completely cleaned up. To help control you can set up a spray regime with an approved fungicide for the plant variety you have. To help prevent on all deciduous trees, shrubs and roses, applying a Green Earth® Dormant Spray kit in early spring, before buds crack open, will give you a clean start each spring. Also try putting fresh mulch under low lying shrubs and roses, to help prevent last year’s spores from splashing up onto the plants.