The difference between rice blast, leaf spot and leaf blight

Although rice blast, leaf spot, and bacterial wilt all appear red-brown spots on rice leaves, the lesions of the three diseases differ in morphology and size. Many farmers are unable to discern these three diseases and often do not see the effect of prevention and control after taking preventive measures. The following are the symptoms of rice blast, leaf spot, and bacterial wilt.

The common symptoms of rice blast in rice blasts are acute, chronic, white-spotted and brown-pointed. The red-brown spots on rice leaves are chronic and brownish. Chronic type: the lesions are prismatic or spindle-shaped, the outer layer is yellow halo, the inner layer is reddish-brown, and the middle is gray-white, and the veins at the central ends of the lesions turn brownish long. Brown spots: brown lesions, needle size, confined to the two-leaf veins, occurred in the resistant varieties or the old leaves of the lower plant.

Flax on leaf and leaf sheaths of rice leaf spot disease Many spots of sesame seeds are large, oval or nearly round, brown to dark brown, and the seedlings are often dead. After the onset of adult plants, brown dots appear after the onset of the disease, and later develop into round or oval lesions with different shades of concentric circles on the lesions. The lesions are yellow-brown on the edges, and some lesions are connected to each other to form irregular large spot.

The occurrence of R. solanacearum occurs at the beginning of rice tillering and reaches the peak at the end of the crop. The erythromycin spots of different sizes appeared on the leaves of the diseased plants, and they aggregated into plaques or strips when severed. Spots first appeared at the tip of the lower old leaves, then gradually turned reddish-brown downwards, and finally the whole leaves withered, while the upper leaves spread, and only a few new leaves of the whole plant remained green and looked far like a fire-like sample. Mainly by the rice plant body nutrition imbalance, resulting in poor quality seedlings.

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