Looking for the right Ornamental fungicides for all your ornamental and trees, look no further than eVegetationManager. Fungi and fungal-like organisms cause more plant diseases than any other group of plant pest with over 8,000 species shown to cause disease.
There are a number of leaf spotting or blotching diseases which occur on trees and shrubs.
Some of these are severe to plant health or aesthetics, such as rose black spot and scab on crabapple, but there are many that have only minor effect. Following are descriptions of several of the more common leaf spot and leaf blotch diseases.
The most prevalent plant diseases in the Northeast are Fungal leaf spots. They are generally favored by cool, wet weather.
Phytophthora root and crown rot is one of the most common problems on many of the bedding plants grown in the United States. Bedding plants like Petunia, snapdragon, geranium and many other species are commonly infected. Once a fungus is introduced into a particular flower beds, it can be very very difficult to grow petunias and snapdragons in the area without being effective by the disease. Common symptoms of is that the crown (base) or lower stem of plants affected with this disease show a dry rot at or near the soil line. Often the rot appears on one side of the plant or affects only lateral branches at first.
Disease control Recommendations:
- Try and purchase disease-free plants
- Keep the garden soil as free of the disease organism , remove disease plants as soon as possible.
- Improve soil drainage.
- Don't plant to deep.
- Use fungicides. Fungicide drenches will be helpful n helpful in controlling the disease in the soil before it becomes out of control.
Good fungicides: Subdue (metalaxyl) is a new systemic fungicide which is very effective in controlling Phytophthora diseases. It can be used a soild drench and works well as a regular preventative application. Aliette (fosetyl-Al) is another that is effective against Phytophthora and is registered for use on a few woody ornamentals.
Captan has been shown to be effective and very widely used. Application rates for Captan. Drench soil thoroughly with 2 tablespoons/1 gallon water (this complies with label directions of 2 lbs captan/ 100 gallons of water) at planting. Repeat twice at 30-day intervals. Works best to apply when the soil is dry and the chemical will penetrate the soil effectively.