Sesame leaf spot

Symptoms are also known as sesame cerebroside sphaeriosis, sesame snake eye disease. The main damage is leaves, stems and pods. There are two common symptoms of leaf. One kind of leaf spot is a small spot with a diameter of 1-3mm, with grayish white in the middle and purple-brown around. The spot on the back of the spot is gray moldy, ie, the conidiophore and conidia of the pathogen. In later stages, multiple lesions merged into large plaques, which ruptured after desiccation and caused severe defoliation. Another kind of leaf spot is snake-eye-like lesions, with a gray and white dot in the middle, surrounded by light gray, peripheral tan, round to not shaped, size 3-10mm. Infected stems produce brown irregular spots. When the humidity is high, the diseased part has dark spots. The fruit is infected with a light brown to dark brown spot and is easily cracked. The disease is often mixed with leaf blight, mixed damage, symptoms vary.

The pathogen Cercospora sesami Zimm is called C. sesamei, a fungus belonging to the genus Deuteromycotina. Conidiophores solitary or clustered, bent into a geniculate, colored, septate, 38-994-5.5 (μm) in size, terminal conidia. Conidia slightly curved, colorless, transparent, with 3-10 septa, size 35-1512.5-4 (μm).

Transmission Pathways and Pathogenic Conditions Pathogens use hyphae to overwinter on seeds and diseased bodies, and new conidia are produced in late spring. They are transmitted through wind and rain and are easily infected during flowering.

Control methods (1) were selected for disease-free seeds and soaked with a temperature of 53-55°C for 10 minutes to kill the hyphae of the seeds. (2) Implement rotation. (3) Clean the pastoral area after harvest to remove the diseased body and turn the land deep. (4) Spray the fungicide at the onset of disease before flowering. For the type of drug, see Sesquito blight.

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