Alternaria rot is a fungal disease that affects mainly navel oranges and lemons. Fruit infected with Alternaria change color prematurely. The decay is softer on lemons than on oranges. Infections typically occur in the grove; disease often doesn’t develop until after harvest, and most damage occurs during storage.
What disease does Alternaria cause?
Alternaria is a cause of chronic fungal sinusitis. Histopathologic examination and microbiologic identification can help in diagnosis.
Is Alternaria a disease?
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.
How do you treat Alternaria leaf spots?
Fungicides are available to help control Alternaria leaf spot and should be used according to the product label. Common fungicides used to control Alternaria leaf spot in New York include chlorothalonil and azoxystrobin.
What is Alternaria brown spot?
Alternaria brown spot is the most serious disease of many popular tan- gerines and tangerine hybrids such as Minneola and Orlando tangelos, Mur- cotts, Sunburst, Novas and others. This disease probably requires more intense management than any of the other fungal diseases.
Is Alternaria toxic to humans?
Alternaria toxins have been shown to exhibit both acute and chronic effects and therefore represent a threat to animal and human health.
What is the common name for Alternaria?
Alternaria alternata (Black Rot, Black Spot)
Is Alternaria a mold?
The most prevalent mold in dry, warm climates, Alternaria alternata has air spores that peak in the afternoon and typically disseminate in warm, dry air.
How do you identify Alternaria?
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).
What is the best fungicide for Alternaria?
Daconil® fungicides from GardenTech® brand offer highly effective three-way protection to prevent, stop, and control Alternaria leaf spot and more than 65 types of fungal disease.
How do you control Alternaria?
The conventional approach to control of Alternaria leaf spot—spray applications of synthetic chemical fungicides—has been recommended for potato (Solanum tuberosum) [7], chili pepper (Capsicum annuum) [8], sunflower [9], and Jerusalem artichoke [10].
What causes Alternaria leaf spot?
Alternaria Leaf Spot diseases that affect Brassica species are caused by the pathogens Alternaria brassicae and Alternaria brassicicola.
What causes Alternaria blight?
Alternaria blight, caused by the fungus Alternaria cucumerina, is a common disease of most cucurbits in warm, rainy weather. A similar cucurbit disease called Alternaria spot, caused by a related fungus (Alternaria alternata), is not known to occur in the High Plains.
How does Alternaria Alternata spread?
It resides in seeds and seedlings, and is often spread by spores as they become airborne and land on plants. It can also spread throughout other plants. Under severe infection, lesions enlarge and become coalesced causing blighting of the leaves.
How do you treat leaf blight?
Treatment:
- Prune and remove heavily affected leaves.
- Provide frequent treatment of neem oil or another fungicide to the foliage.
- Avoid getting water onto the leaves as it recovers.
- Keep the plant away from other plants temporarily.
- Monitor daily to ensure the infection has stopped spreading.
What are the black spots on my potato leaves?
Potato blight or late blight disease is caused by a fungus-like organism Phytophthora Infestans. It spreads rapidly in warm humid weather in the foliage of potatoes and outdoor tomatoes causing collapse and decay of the foliage and infection of the potatoes or tomatoes.
How does Alternaria grow?
Alternaria alternata is mainly an outdoor fungus that typically grows on vegetation. However, the species can also be found indoors, where it prefers humid locations such as bathrooms and often produces large brown spores that are a well-known cause of allergy and asthma.
Which type of spores are reported in Alternaria?
2011; Sabariego et al. 2012). Based on a weather required for spore dispersal, the genus Alternaria was placed among fungal species that produce ‘dry spores‘.
How many species of Alternaria are there?
The genus Alternaria includes more than 250 species. The traditional methods for identification of Alternaria species are based on morphological characteristics of the reproductive structures and sporulation patterns under controlled culture conditions.
What is habitat of Alternaria?
Habitat/Ecology. Alternaria spp. are cosmopolitan dematiaceous fungi commonly isolated from plants, soil, food and indoor air environment. Alternaria species are known as major plant pathogens {1635; 725} and saprophytes on many substrates {816; 1056; 3729; 725}.
Is Alternaria a parasite?
The observation that saprobic Alternaria species can become parasitic when they meet a weakened host illustrates that the distinction between saprophytic and parasitic behaviour is not always evident. Despite the taxonomic and pathogenic differences between Alternaria species, they cause similar infection patterns.