4168. HEALTH. Fungal disease in persimmons - anthracnose disease or leaf spot fungi

Fungus causing anthracnose on persimmons appear as dark brown spots.

 

Anthracnose disease is not often lethal in mature trees. These diseases in persimmon trees are caused by leaf spot fungi, and some affect the fruit as well as the leaves. Persimmon disease control when it comes to anthracnose involves keeping a clean garden. The anthracnose spores overwinter in leaf litter. In spring time, the winds and rain spread the spores to new foliage.

Read more at Gardening Know How: Persimmon Tree Diseases: Troubleshooting Diseases In Persimmon Trees https://www.gardeningknowhow.com/edible/fruits/persimmon/persimmon-tree-diseases.htm

 

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  Colletotrichum horii causes serious anthracnose on persimmon.

 lesions comprise twig blight, leaf defoliation, fruit drop and fruit rot

 

 Anthracnose symptoms on twigs, leaves and fruits first appear in the spring as darkish, oval or elliptic spots, or as pin-pricks on newly-formed twigs. The minute spots develop into dark purple or dark brown lesions with a sharp line of demarcation between diseased and symptomless tissues

 

  Pale orange conidial masses are frequently produced in the lesion centre. Under favorable conditions, adjacent lesions may coalesce, increasing in size until the entire twig is infected (Figure 1B). When a twig is girdled or completely infected, then dieback results (Figure 1C). The lesions may become dormant under unfavorable conditions but, in this situation, the fungus still continues to extend into the xylem, resulting in collapse with longitudinal cracking and finally forming cankers on a twig (Figure 4). Leaf defoliation occurs if lesions develop at the base of petioles. The pathogen infects petioles and leaf veins to produce the small, round or ovoid, sunken, purple to dark brown spots (Figure 1F), but they form later than those on young twigs. These small spots develop into the larger lesions, but they rarely coalesce on the petioles and leaf veins. If a petiole is infected, the leaf may continue to develop and remain green for an extended period, but may easily defoliate in the wind. The persimmon fruits can be infected throughout the entire fruit-growing season. In young fruits, the lesions are often circular or oval, 3–8 mm in diameter, purple to dark purple, and occasionally slightly depressed. As the disease progresses, sometimes fruit lesions reach ∼20 mm in diameter (Figure 1G). The centre of the lesions becomes grey-white over time, while the broad margins remain dark purple. Pale orange conidial masses are produced in the lesion centre. Under dry conditions, the diseased lesions are sunken, and a longitudinal crack often occurs through the centre (Zhang 2008). If fruits are badly infected, they may drop in an unripe state (Figure 1H). In pre-mature fruits, the diseased lesions are often dark brown or purple dark, oval, sunken, with small cracks. Larger cracks often form and almost all deep cracks are produced in a longitudinal direction (Figure 1I). Anthracnose of persimmon fruits also occurs in market shelves and storage warehouses, resulting in fruit rot.

 

 

 

 

Anthracnose disease is a fungal disease in plants. Anthracnose persimmons. Anthracnose symptoms on twigs, leaves and fruits first appear in the spring as darkish, oval or elliptic spots, or as pin-pricks on newly-formed twigs. The minute spots develop into dark purple or dark brown lesions with a sharp line of demarcation between diseased and symptomless tissues.  

Colletotrichum species are common pathogens for plant anthracnose but have recently emerged as a human opportunistic pathogen causing keratitis and subcutaneous fungal infection, which potentially can lead to life-threatening systemic dissemination. Do not eat infected persimmons.

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#singaporefruits
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REFERENCE:
https://www.tandfonline.com/doi/pdf/10.1080/21501203.2010.526644

 
UPDATES:
https://2010vets.blogspot.com/2022/10/4168-health-fungal-disease-in.html