Mildew is any of several parasitic fungi that attack a wide variety of crops, including fruits, vegetables, and grains. The term "mildew" is also applied to various fungus diseases that appear as discolored areas on leather, paper, fabric, and many other materials. Contrary to popular belief, these diseases are caused not by mildews but by related fungi.
Generally, mildews are divided into two groups: powdery mildews and downy mildews. Powdery mildews have a fine powdery appearance on the surface of the plant. They usually attack roses, gooseberries, and grasses, including the cereal grains. Downy mildews have a fuzzy appearance on the host plant. Downy mildew of grape (Plasmopara viticola) is one of the most destructive of all mildews. It has caused great damage to both American and European varieties of grapes. Other downy mildews attack melons and lima beans.
Both powdery and downy mildews cause dwarfing, deformation, and loss of affected plant parts. Most mildews can be controlled by applying a liquid or powder fungicide to the infested plants.
Downy mildews are classified in the class Phycomycetes, order Peronosporales. Powdery mildews are classified in the class Ascomycetes, order Erysiphales.
More by this Author
Bricks are made from clay and other minerals, which are processed into a workable consistency, formed to standard sizes, and fired in a kiln to make them strong, durable, and attractive. Building bricks are inexpensive...
The flea, which is found on dogs, Man and cats, occurs nearly everywhere that dogs are found. The male is about two millimetres long, with the female about a millimetre and a half longer. Fleas usually feed every day...
Nails, used since ancient times, are still the fasteners most commonly used for joining wood, especially in building wood-frame houses. More than 60,000 nails may be used in a five-room house.
No comments yet.