Try this simple cure if your maple tree is infected with a fungus called tar spot. What are those spots on your maple leaves? Tar spot is a fungal disease that causes black tar-like spots on the leaves of red, silver, Norway, sugar and Manitoba maples (but it doesn't seem to affect Japanese maples).
What are the symptoms of leaf spot?
Leaf wilting is a typical symptom of verticilium wilt, caused by the fungal plant pathogens Verticillium albo-atrum and V. dahliae. Common bacterial blight symptoms include brown, necrotic lesions surrounded by a bright yellow halo at the leaf margin or interior of the leaf on bean plants.
Diplocarpon rosae, or black spot fungus, isn't just a disease of roses. It can attack any plant with fleshy leaves and stems if the conditions are right. As the fungus develops, those black spots on leaves are ringed with yellow. Soon the entire leaf turns yellow and falls.
Black spot disease is also known as diplopstomiasis or fluke disease. It is a freshwater fish disease caused by flatworm larvae of the genus Neascus. It appears as tiny black spots on the skin, fins and flesh of the fish. The life cycle of the parasite typically involves a fish-eating bird, a snail and a fish.
Black spot is the most serious disease of roses. It is caused by a fungus, Diplocarpon rosae, which infects the leaves and greatly reduces plant vigour. Expect to see leaf markings from spring, which will persist as long as the leaves remain on the plant.
Leaves then turn yellow and drop prematurely, resulting in weakened plants. The disease is worse in warm, wet weather. The black spot fungus produces spores which are released under wet conditions and usually spread by rain-splash. The disease can also be passed from plant to plant on hands, clothing or tools.
Tar spot is a fungal disease that causes a great deal of concern for home gardeners due to its appearance. Luckily, this disease is generally a cosmetic problem, rather than a real health issue for trees. The tar spot seen on maples is caused by three related fungi, Rhytisma acerinum, R. americanum and R. punctatum.
Blight is a rapid and complete chlorosis, browning, then death of plant tissues such as leaves, branches, twigs, or floral organs. Accordingly, many diseases that primarily exhibit this symptom are called blights.
Black spot (blackspot) is one of the most common diseases of rose bushes; and, if left unchecked, it can cause quite a bit of damage to your rose garden. Caused by the fungus Diplocarpon rosae, black spot begins just as its name suggests, with black spots showing up on the surface of the leaves.
These tiny insects generally hide on the underside of leaves and along stems. Fungal diseases also can cause brown spots on plant leaves. Removing the infected leaves, avoiding wetting foliage when watering plants' soil and increasing air circulation around plants typically takes care of fungal diseases on houseplants.
Tar spot is a common, visually distinctive and primarily cosmetic fungal leaf spot disease. While tar spot can affect many species of maple including big leaf, mountain, red, Rocky mountain, sugar, and sycamore maple, in Wisconsin, this disease most commonly affects silver maple.
A normal mole, like the one pictured here, is usually an evenly colored brown, tan, or black spot on the skin. It can be either flat or raised, round or oval. Melanoma is a cancer that begins in the cells that give skin its color. Normal moles also develop from these skin cells.
Be sure to dispose of these leaves. Do not compost them. Then treat your plant with a fungicide, such as neem oil. Continue to remove leaves and treat the plant until all signs of the plant rust are gone.
Fabraea leaf spot, also known as leaf blight and black spot, is caused by the fungus Fabraea maculata. This disease usually appears late in the growing season but can occasionally develop in late May and early June. Fabraea leaf spot attacks leaves, fruit, and twigs of pear. Severely infected fruit may also crack.
Leaf spot and melting out in turf. Leaf spot and melting out are two turf diseases with similar symptoms, caused by different fungi. Melting out is caused by Drechslera poae and leaf spot by Bipolaris sorokiniana. Symptoms of both diseases start out as water-soaked (dark green) spots on the grass blades.
Powdery mildew. Powdery mildew is a fungal disease that affects a wide range of plants. Powdery mildew diseases are caused by many different species of fungi in the order Erysiphales, with Podosphaera xanthii (a.k.a. Sphaerotheca fuliginea) being the most commonly reported cause.
Red bumps on maple leaves. Your tree probably has maple bladder galls or gall mites. Maple bladder galls are small, red, round wart-like structures about 1.5mm to 3 mm in diameter that can cover the upper surface of the foliage on silver and red maple trees. These galls are caused by a small mite, Vasates quadripedes.
Some fungal infections damage branches, limbs and roots but others may ultimately kill the tree.
- Cankers. Cankers are sores that invade weakened bark and limb tissue.
- Verticillium Wilt.
- Girdled Roots and Root Rot.
- Leaf Spots, Galls and Mildew.
Horticultural oils or narrow range oils are lightweight oils, either petroleum or vegetable based. They are used in both horticulture and agriculture, where they are applied as a dilute spray on plant surfaces to control insects and mites. They are also sometimes included in tank mixes as a surfactant.
Individual spores are encased in structures called sporangia, which are the dots that appear on the underside of fern fronds. The sporangia have caps called indusia that contain the spores until they reach maturity. When the indusia burst open, they propel the spores forcefully from fern plants.
Rhizoctonia Blight. Rhizoctonia blight is a severe foliar blight of ferns that is caused by the fungus Rhizoctonia solani. Brownish black, irregularly shaped spots on your fern's foliage that are close to the crown or at the top indicate an infection. When the foliage dries, the infected fronds turn to a tan color.