How to control rice diseases at heading stage and how to control rice stem borer?

Early-planted rice in Changhua, Taichung and Nantou will enter the heading stage, due to the recent continuous rainfall, which is suitable for the occurrence of panicle rice fever and sheath blight, while the monitoring data of Chilo suppressalis show that a large number of adult moths have appeared since the 22nd, and the hatched larvae after spawning will harm rice. Taichung District Agricultural improvement Farm called on farmers to apply preventive pesticides 3 to 5 days before heading to avoid diseases and insect pests such as panicle rice fever, sheath blight and Chilo suppressalis.

Before rice heading, the spores of rice fever fall with the wind, Rain Water or dew falls on the tongue and nodes of flag leaves. When the rice ear is pulled out, it is infected through this part, often bending the neck of the diseased part, commonly known as hanging spike or hanging dog. However, sheath blight infected the lower leaf sheath of rice plant at the initial stage, and then gradually spread upward, showing tiger spot syndrome.

7 to 10 days after the occurrence of a large number of adult moths of Chilo suppressalis, the hatched first instar larvae drill into the lower leaf sheath of rice plants to feed, which is the key time to control Chilo suppressalis. If the application is delayed, the larvae will decay into the stem and the symptoms of white ear will appear.

Taichung field calls for simultaneous prevention and treatment

Liao Chun-da, an associate researcher in the middle of Taiwan, said that recently, under the influence of the hot weather and continuous rainfall, it is suggested that farmers should apply pesticides before heading, otherwise rice will suffer from panicle fever and sheath blight after heading, and recently, a large number of rice stem borer has been found to occur. Failure to control will cause losses, he suggested that farmers can simultaneously spray drugs to control rice fever, sheath blight and rice stem borer three kinds of diseases and insect pests. Application of drugs and methods can contact the plant protection information system or local improvement sites.