What is a Chasmothecia?

Chasmothecia are the sexual fruiting bodies produced by the powdery mildew organism. They only form on the surface of heavily diseased vine tissue and take about 90 days to fully mature. Immature chasmothecia are yellow, and gradually turn brown, then black.

How are powdery mildews identified?

The first sign of problems is usually white, powdery spots or patches on the top side of leaves or on plant stems. The powdery surface growth gradually spreads to cover the entire leaf, including the undersides, until the plant looks like it’s dusted with white powder. Infected leaves turn yellow and twisted.

What is powdery mildew?

powdery mildew, plant disease of worldwide occurrence that causes a powdery growth on the surface of leaves, buds, young shoots, fruits, and flowers. Powdery mildew is caused by many specialized races of fungal species in the genera Erysiphe, Microsphaera, Phyllactinia, Podosphaera, Sphaerotheca, and Uncinula.

What is the difference between downy mildew and powdery mildew?

Both usually affect only the leaves, but downy mildew can be identified from the fungal layer on the underside of leaf, that develops in moist weather and is accompanied by leaf spots on the top of the leaf. Powdery mildew causes white, powdery, fungal growth in the absence of any leaf spotting.

What is Ectophytic mycelium?

Fungi based on reproductive structures: Ectophytic fungus: If the thallus is present on the body surface of the host then it is called ectophytic. Eg. Oidium. Endophytic fungus: If the fungus not present on the body surface but, penetrates into the body of host cell then it is called endophytic.

What is endophytic mycelium?

Endophytic fungi inhabit plant tissues without destroying or producing substances that cause an infection to the host cell. 45. Their coevolution means that the endophytes produce the same or similar compounds to those originating from the plant.

What is PM on plants?

Powdery mildew is a common fungus that affects a wide variety of plants. It is easily identified and appears as light grey or white powdery spots usually found on infected leaves, but can also be found underneath, or on stems, flowers, fruit or vegetables.

What is black spot fungus?

Black spot (blackspot) is the most important fungal disease of roses worldwide. The initial symptoms start as feathery-edged, black spots on lower leaves. As these spots enlarge, the leaves turn yellow and drop off. The disease continues up the stems until the entire plant becomes defoliated.

What pathogen causes downy mildew?

Downy mildew is caused by the fungus Peronospora parasitica. Cabbage fields are infected through infected transplants or windblown spores anytime during the growing season. The symptoms include the development of a white and fluffy fungal growth on the undersides of the leaves, and on petioles and stems.

What is difference between fungal wilt and bacterial wilt?

Fungal and bacterial wilts display many of the same or similar symptoms of other plant diseases and disorders, making diagnosis sometimes difficult. However, the most prominent symptom in fungal wilts is xylem vascular discoloration and in bacterial wilts the presence of bacterial ooze, vascular discoloration and rot.

What is mycelium in simple words?

Definition of mycelium : the mass of interwoven filamentous hyphae that forms especially the vegetative portion of the thallus of a fungus and is often submerged in another body (as of soil or organic matter or the tissues of a host) also : a similar mass of filaments formed by some bacteria (such as streptomyces)

What is Holocarpic and Eucarpic fungi?

UPLOAD PHOTO AND GET THE ANSWER NOW! Solution : Holocarpic fungi: Those fungus in which the vegetative structure is transformed into reproductive structure are called holocarpic fungi. Eucarpic fungi: Those fungus in which a part of that thallus is converted to reproductive structure known as eucarpic fungi.