Which type of septa is present in Alternaria conidia?
a, Conidia possess only transverse septa and no beak; b, Conidia possess both transverse and longitudinal septa and no beak; c, Conidia possess only transverse septa and beak; d, Conidia possess both transverse and longitudinal septa and short (<15 m) and medium beak (15-30 m); e, Conidia possess both transverse and …
Is Alternaria Ascomycetes or deuteromycetes?
Alternaria is a genus of Deuteromycetes fungi.
What causes Alternaria leaf spot?
Alternaria leaf spot is caused by the fungus Alternaria dauci. Infection can be initiated by seedborne or windborne spores (conidia), which germinate in the presence of free moisture and penetrate leaves through wounds or natural openings.
How do you identify Alternaria Alternata?
The identification of Alternaria species requires a combination of morphological features and molecular methods. Morphological features such as conidial shape, size of primary conidium, conidial branching arrangement and primary conidiosphore length were used in the identification by Simmons and Roberts (1993).
Does Alternaria have Septate hyphae?
Species of Alternaria occur worldwide on many foods and plant materials. They have septate hyphae and appear to be dark, gray-green in color, and almost black on the reverse side of colonies growing on agar.
What is habitat of Alternaria?
Alternaria alternata is mainly an outdoor fungus. Alternaria alternata is mainly an outdoor fungus whose spores disseminates in warm, dry air, so in temperate climates and found at higher concentration in dry windy conditions. It may also be found in damp, insufficiently ventilated houses.
What is Alternaria plant?
Alternaria is one of the most common diseases of broccoli, kale, and other Brassica crops. It is sometimes referred to as black spot. It affects leaves, and often results in head rot. It can be severely yield limiting.
What is the perfect stage of Alternaria?
The germ tubes infect the host plant through stomata or, epidermal cells or injuries caused by insects. The perfect stage of Alternaria belongs to Pleaspora infectoria of Loculoascomycets fungus (Fig. 4).
Is Alternaria mold toxic?
Alternaria is an allergenic mold with a velvety texture. You might see it in the bathroom or near a sink as it is typically a sign of water damage. Aspergillus is another allergenic mold that can be toxic for people with weak immune systems.
What is the class of Alternaria?
DothideomycetesAlternaria / Class
How do you fix Alternaria leaf spots?
Treatment for Alternaria requires fungicide to be sprayed directly on infected plants, as well as improvements in sanitation and crop rotation to prevent future outbreaks. Organic gardeners are limited to sprays of captan or copper fungicides, making control much more challenging.
How do you treat Alternaria on zinnias?
Start with pathogen-free seed. Seed can be treated with hot water at 125°F for 20 minutes but will also reduce germination. Seeds can also be treated with 1% to 2.5% lactic acid for 30 min or 12% peroxide for 20 min. Plant resistant cultivars or species such as Z.