Phytophthora root and crown rots are caused by a group of related soilborne fungi in the genus Phytophthora.
Crown rot
Varieties
'Cambridge Scarlet' forms 3-foot tall clumps with bright scarlet flowers.
Excessive moisture can actually cause root and crown rot, so make sure to plant your oak tree in an area that is well drained.
Hydrogen peroxide and cinnamon aren't just common household items - they're remedies for leaf problems like bacterial rot (a soft wet area on a leaf) or crown rot.
Affected trees should be examined more carefully for the crown rot symptoms on the rootstock. These symptoms are reddish-brown, water-soaked areas of necrotic tissue on the lower tree trunk and rootstock (photo 2-24).
Some orchids are susceptible to crown rot. Crown rot happens when the crown of an orchid is kept moist for extended periods of time.
Fungal disease — namely, crown rot and root rot caused by excessive watering — is enemy No. 1 with African violets. Bottom-water by setting the pot in a saucer of water.
Crown rot is the main threat, particularly if soil conditions are wet. The fungal infection occurs at the base of the stalks where crowns turn brown and soften.
Plants suffering from rot should be dug up and destroyed immediately.
Although asparagus is generally problem-free, here's what to do if trouble strikes: Crown rot can occur if you're growing asparagus in poorly drained or excessively acidic soil, and the plants rot away at the base.
Although pests aren't usually a problem, larkspurs sometimes succumb to fungal diseases, such as powdery mildew, crown rot, and root rot.
Crown Rot of Asparagus
Early Blight of Tomatoes and Potatoes
Late Blight of Potato and Tomato
Pea Diseases
Postharvest Diseases of Fruits & Vegetables
Potato Scab
Red Turnip Beetles in the Home Garden
Rhubarb Leaf Spots ...
With the exception of crown rot and leaf rot, Hosta plants are relatively disease free. Deer find the tasty and if deer are a problem in your neighborhood, you might try planting daffodils around your hosta to keep them away from the emerging shoots.
Damping off is the single term used to describe underground, soil line, or crown rots of seedlings due to unknown causes. The term actually covers several soil borne diseases of plants and seed borne fungi.
Other fungal diseases that are occasional problems include Fusarium root and crown rot, Phytophthora, and Rhizoctonia. Symptoms are very similar among these diseases and are usually first noticed as wilting or tip burn on leaves.
‘Foot rot' is a more serious crown rot caused by a fungus. Foot rot will spread to other plants. Destroy any affected plants and allow the planting area to dry. You may need to relocate the bed.
These diseases include root and crown rots, and downy mildew. If your plants show disease signs, remove any affected leaves or flowers, and apply pesticides if needed.
Want to learn more about growing pansies?
Crown rot (Southern blight fungus)-outer leaves wilted and yellowed
Wilted and browning leaf tips-not enough water
*Foliar nematodes-parallel damage between veins is becoming a major problem ...
It is wise to bottom water all house plants, but particularly African violets. Watering from the top can cause crown rot in violets, which is fatal. Never leave your plants sitting in water for more than a couple hours though. This can also be fatal ...
If they experience poor drainage, your crop may develop crown rot. Try to handle the plants as little as possible. If you do find any infected or diseased plants, remove them from your garden immediately (do not compost them!).
To avoid crown rot or damping off, top off the seed mix with 1/2 inch of sharp sand or vermiculite; this keeps vulnerable young sprouting stems from rotting off due to excess moisture at the soil surface.
This disease can't be cured, but if bulbs are dug up and new ones planted it is likely that they will be fine. "Crown rot" causes the bulb and flower to die under the ground.
and drainage requirements can be met by using ample gravel or sand on a sunny hill or raised bed. Five inches of sand with a small amount of organic matter mixed in is ideal. A thin mulch of stone chips or gravel will reduce the chances of crown rot.
Bottom watering is the key to this plant; crown rot and leaf spot are the two biggest enemies and keeping the water away from both is key to keeping this plant healthy. Needs the higher humidities and good indirect light that orchids crave...
Gray mold, blight, crown rot and powdery mildew are diseases which may attack. At the first sign of problems, spray with a fungicide such as benomyl, captan or ferbam, used according to manufacturer's instructions.
about 10 plants will be enough to provide a steady supply for most households. For best results plant in full sun or semi shade in a nutrient rich, well drained moist soil with a pH of between 5.5 - 6.7. Note: If plants become waterlogged crown rot ...
 See also: Crown, Plant, Water, Soil, Drain
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