Simple diagnosis and Control of "withered Heart" in Rice

1. Simple diagnosis of "withered heart" of rice

1. A "withered heart" caused by pests. Chilo suppressalis, Chilo suppressalis and mole cricket can all cause "withered heart". The main differences are as follows: (1) Chilo suppressalis: large wormhole, many insect feces, and feces are generally arranged between rice leaf sheath and stem. The stem, leaf sheath and leaves of the killed rice turned yellow. The harm is more serious at the edge of the rice field and lighter in the middle of the field. (2) Chilo suppressalis: after hatching, the young borer first gathered on the inside of the rice leaf sheath to feed, and water-stained macula appeared outside the damaged leaf sheath, and then gradually yellowed and withered. The young borer is slightly larger and then enters the rice stem, causing the tip of the rice flag leaf to turn yellow, and when the heart leaf is serious, the heart leaf dies. There are wormholes on the stems of the decayed rice, and there are less insect droppings outside the holes and more in the holes. (3) Chilo suppressalis: the young borer first eats rice heart leaves, resulting in water loss of heart leaves such as onion tubes, bluish white, commonly known as "false withered heart". Pull out the curled leaves of the heart. It can be seen that the section is neat. If the borer continues to harm, bite off the heart leaf and destroy the growing point, the heart leaf will die completely and become a "really withered heart." The boiled rice stem worm hole is small, there is no insect feces outside the hole, and there are white fine-grained insect feces in the hole. (4) mole cricket: bite off some or all of the rice bushes from the base, causing the heart leaves of rice to turn yellow and wither. The damaged rice is easy to pull up the whole plant, and there are no wormholes and insect dung on the rice stem. This kind of heart withering usually occurs only when rice fields are exposed to the sun or because of long-term drought and there is no water in rice fields.

two。 A "withered heart" caused by disease. Both rice virus disease and bacterial leaf blight can cause rice "withered heart". The differences between them are as follows: (1) virus disease: the symptoms of withered heart are similar to those caused by Chilo suppressalis, but there are no wormholes and feces on rice stems, and the heart leaves are not easy to pull up. Leaves sandwiched in a piece of glass to squeeze sterile pus. (2) bacterial blight occurred mostly in rice tillering stage. After the disease, the diseased plant heart leaf or 1-2 leaves under the heart leaf lost water, curled, withered and necrotic, then other leaves also gradually curled and withered, and finally the whole plant leaf withered. Take a small piece of fresh diseased leaf and squeeze it in a piece of glass. Looking at the light, you can see that there is yellow bacterial pus flowing out of the vein mouth of the leaf.

2. control measures of "withered heart" of rice

1. The withered heart caused by the harm of borer can be controlled by spraying "Regent", "killing borer", "insect frustration" and other symptomatic insecticides.

two。 The withered heart caused by the harm of mole cricket can be killed by bait such as wheat bran mixed with trichlorfon when drying the rice field.

3. For the withered heart caused by virus disease, the rice seeds should be soaked with "strong chlorine" before sowing, and the control of poisonous insects such as rice planthopper and leafhopper should be done well.

4. For the withered heart caused by bacterial blight, in addition to disinfecting rice seeds, symptomatic agents such as "Shi Baoling" and "Yekuning" should be sprayed in time to control the disease.