How to prevent rice blast disease

(Baonghean.vn) - Recently, rice blast disease has continued to cause local damage to seedlings and spring rice in some localities. The whole province currently has over 6 hectares infected with the disease, of which nearly 1 hectare is severely infected.

1. Symptoms of the disease

Rice blast disease can occur from the seedling stage to maturity and can cause damage to leaf sheaths, leaves, stem internodes, panicle necks, panicles and grains.

- Disease on seedlings: The disease spots on the leaves of seedlings are initially small ovals, then form diamond-shaped or similar to diamond-shaped, pinkish-brown or yellowish-brown in color. When the disease is severe, clusters of disease spots appear one after another, causing the seedlings to wither or die.

-Disease on rice leaves: On the stem and the neck of the flower, the disease starts as a small black spot that later grows larger and surrounds the stem, causing the stem to constrict. On the neck of the flower, the silver flower breaks. On the grain, it is rarely attacked.

Diseased rice Healthy rice

Usually, the disease lesions are initially small green or oil-stained spots, then turn light gray. On susceptible rice varieties, the lesions are large, diamond-shaped, thick, light brown, sometimes with a light yellow halo, the center of the lesion is grayish brown.

2 - Prevention measures

To effectively prevent blast disease on spring rice, for areas of seedlings that have appeared with the disease, it is necessary to prevent it with specific drugs such as Tricyclazole, fenoxanil... before planting. Do not use seedlings that are heavily infected with blast disease for planting.

- To prevent the disease from spreading and causing serious damage on a large scale, it is necessary to closely monitor the fields to detect the disease in time, thereby having effective treatment measures. If the weather is humid and combined with top dressing, it will be very favorable for the disease to develop. If the disease is severe, it can cause leaf burn, affecting the growth and yield of the rice plant. Therefore, if the rice is found to be infected, it is necessary to immediately stop top dressing with nitrogen, keep enough water in the field, and not let it dry to limit nitrogen loss, help the rice grow and develop healthily, and increase its resistance to disease.

According to Mr. Trinh Thach Lam, Head of Plant Protection Department, Provincial Plant Protection Department: If the disease is mild, just add lime and continue monitoring. When the infection rate is 3-5%, spray with one of the following drugs: Katana 20SC, Beam 75WP, Filia 525SE, Vista 72.5 WP, Bump 650WP, Kabim 30WP, Ensino 40 SC, ... according to the recommended amount, check again after a week if the disease continues to occur, spray again for the second time after the first spray from 5-7 days, when the disease stops developing, fertilize again.

Phu Huong - Nghiem Vien