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A leaf spot is a limited, discoloured, diseased area of a leaf that is caused by fungal, bacterial or viral plant diseases, or by injuries from nematodes, insects, environmental factors, toxicity or herbicides. These discoloured spots or lesions often have a centre of necrosis (cell death). [ 1 ] Symptoms can overlap across causal agents ...
Low winter temperatures. Split peel. Rapid filling of pulp of fruit. Taiwan marginal scorch. Unknown cause. "Segmented Banana". Chilling injury to fruit. One of the less common plantain diseases is exostentialis clittellus referred to by most plantain and banana farmers as "segmented banana". This is a result of the peel forming tiny inter ...
Disease of Palm Cooke, (1876) Pestalotiopsis palmarum is the causative agent of a fungal disease of bananas, coconut and Date palms . The fungus causes leaf spots, petiole / rachis blights and sometimes bud rot of palms. Unlike other leaf spot and blight diseases, Pestalotiopsis palmarun attacks all parts of the leaf from the base to the tip.
Black sigatoka is a leaf-spot disease of banana plants caused by the ascomycete fungus Mycosphaerella fijiensis (Morelet), also known as black leaf streak. It was discovered in 1963 and named for its similarities with yellow Sigatoka, which is caused by Mycosphaerella musicola (Mulder), which was itself named after the Sigatoka Valley in Fiji .
External links. List of pests and diseases of roses. Rose aphid (Macrosiphum rosae) feeding on buds and shoots. Rose rust (Phragmidium) Two-spotted mite (Tetranychus urticae) on Gardenia. Yellow tea thrips (Scirtothrips dorsalis) Bristly roseslug (Cladius difformis) on the underside of a leaf. Cottony cushion scale (Icerya purchasi) Leaf damage ...
Leaf curl. Peach leaf curl is a plant disease characterized by distortion and coloration of leaves and is caused by the fungus Taphrina deformans, [1] which infects peach, nectarine, and almond trees. T. deformans is found in the United States, Europe, Asia, Africa, Australia, and New Zealand. [2] Peach leaf curl reduces the amount of leaves ...
Alternaria alternata. Alternaria alternata is a fungus causing leaf spots, rots, and blights on many plant parts, and other diseases. It is an opportunistic [citation needed] pathogen on over 380 host species of plant. It can also cause upper respiratory tract infections [1] and asthma in humans with compromised immunity.
Bacterial soft rots are caused by several types of bacteria, but most commonly by species of gram-negative bacteria, Erwinia, Pectobacterium, and Pseudomonas. It is a destructive disease of fruits, vegetables, and ornamentals found worldwide, and affects genera from nearly all the plant families. The bacteria mainly attack the fleshy storage ...