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

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

- Disease on seedlings: The disease spots on the leaves of seedlings are initially small ovals, then form into diamond-shaped or similar diamond-shaped shapes, 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 gradually grows around 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 spots are initially small green or oily 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 middle of the lesion is grayish brown.

2 - Prevention measures

To effectively prevent rice blast disease in spring rice, for areas where the disease has appeared, it is necessary to prevent it with specific drugs such as Tricyclazole, fenoxanil... before planting in the field. Do not use rice seedlings that are heavily infected with rice 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 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 to monitor. When the infection rate is from 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 appear, spray again for the second time after spraying the first time for 5-7 days, when the disease stops developing, fertilize again.

Phu Huong - Nghiem Vien