Currently, on main-season rice in coastal provinces and the Red River Delta, small leaf rollers arise, grow, and cause damage at a density 4-5 times higher than the same period in 2022 and recent years, distributing over a wide area.
The Plant Protection Department (Ministry of Agriculture and Rural Development) has sent a document to the Department of Crop Production and Plant Protection of Northern provinces and cities, and Northern Plant Protection Center on strengthening the prevention of harmful organisms on 2023 main-season rice on August 21st, 2023
Due to the recent weather conditions, there has been continuous alternating sunshine and rain, combined with thunderstorms, this is a favorable condition for several SVGH species to arise and develop, causing damage to rice, especially small leaf rollers, brown planthoppers, and white-backed planthoppers...
Egg nest density is commonly 50 - 100 eggs/m2, in high places 200 - 300 eggs/m2, locally 500 - 700 eggs/m2 (Nam Dinh, Thai Binh, Ninh Binh, Bac Ninh). Common larvae are 10 - 20 insects/m2, in high places 30 - 50 insects/m2, especially in some places 100 - 200 insects/m2 (Thai Binh, Nam Dinh, Ninh Binh, Bac Ninh, Ha Nam, Hung Yen, Thai Nguyen, Hai Phong...).
In the coming time, the density of small leaf rollers will continue to increase in the fields, potentially causing serious damage and impact on crop rice production if timely, drastic, and effective prevention is not directed.
To protect the safety of rice production from now until the end of the season, the Plant Protection Department has proposed several contents for the Departments of Crop Production and Plant Protection of Northern provinces and cities to report to the Department of Agriculture and Rural Development to direct professional department to implement seriously.
