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In the early stages of the onset of the symptoms of cloves, the leaves had chlorotic spots that gradually expanded to form round or near-circular lesions, 3 to 10 mm in diameter, brown or dark brown, with rims but not obvious. The lesions turned grayish brown and dense black moldy spots later, which are conidia and conidiophores of pathogens. The lesions are connected to each other so that a large part of the leaves are brown and yellow, withered and even shattered.
Pathogens and pathogenic bacteria are pathogens of the genus Alternaria. Conidial stems scattered or several sets of brown, brown; conidia brown. The disease is caused by mycelium or conidia overwintering on diseased leaves and spreading with rain droplets.
Lilac Brown Spots Symptoms on lilac leaves are polygonal, irregular or round to nearly round, brown, 5 to 10 mm in diameter. In the late stage of the lesion, the central tissue became gray-brown and the lesion was dark brown. The lower epidermis lays a dark gray moldy layer, which is the conidia and conidiophore of pathogenic bacteria. When the disease is severe, there is a small amount of moldy layer on the front of the lesion. The lesions are connected to each other as large plaques and appear gray and brown.
Pathogens and Pathogenic Pathogens The pathogenic bacteria is C. syringae, where the pathogenic bacteria spores or mycelia overwinter on deciduous trees, and conidia spread by wind and rain. Rainwater, heavy dew, high planting density, and poor ventilation can easily lead to disease.
In the early stages of the onset of C. solanacearum lesions, nearly round, polygonal or irregular lesions were scattered on both sides of the leaves. The lesions have a darker edge and the central tissue is lighter in color and gray-brown. At the later stage of disease, a small amount of black spots were produced in the center of the lesion, which is the conidia of the pathogen.
Pathogens and Pathogenic Pathogens are Clostridium anatipestifers. Pathogens use conidia to overwinter on diseased leaves, and conidia spread by wind and rain.
Control measures to reduce the source of infection. Remove the diseased body; perform proper trimming and cut off the sick tip.
Spray 1% of the same amount of Bordeaux mixture on the onset; 70% thiophanate-methyl wettable powder 1000 times. For 10 to 15 days, it is better to spray 3 to 4 times.
Clove leaf spot
Clove leaf spot has clove black spot, clove brown spot and clove spot blight.