In the process of growing rice, it often causes "dry heart" due to diseases or insect pests. Correctly judging the causes of the "dry heart" of rice and taking timely and targeted measures to prevent and control it is an effective guarantee for high yield and stable production of rice.
First, the simple diagnosis of rice "dry heart"
(1) "Dead heart" caused by insect pests. The main differences between the damage to rice, such as Daxie, Erhuahuai, Sanhuayu, and Chinese wolfberry, can be caused by:
1. Big cockroaches: large wormholes, many insect feces, feces generally lined between rice sheaths and stems. The stems, leaves, sheaths and leaves of the victim rice all turned yellow. The damage is heavier in the rice field and lighter in the middle of the field.
2. Insecticides: After hatching, the young larvae first clustered on the inside of the rice leaf sheath to feed on the food. The water-stained macules first appeared outside the damaged leaf sheath, and then gradually yellowed to death. The young larvae enter the rice stem after being slightly larger, resulting in the yellowing of the tip of the flag leaf of the rice and the death of the heart and leaves in severe cases. There are wormholes on the stalks of indica rice. There are few worms outside the hole and more insects in the hole.
3. Sanhua wolfberry: The larvae feed on the heart of the rice leaf first, resulting in dehydration of the heart and leaves, such as the onion tube and greenish white, commonly known as "false dry heart." The curled heart was drawn out, showing that the section was neat. If the locusts continue to jeopardize, bite off the heart and destroy the growing point, the leaves will completely die and become a "dry heart." The stem borers of the japonica rice were smaller and there were no insect feces outside the holes, and there were white fine-grained insect feces in the holes.
4. è¼è›„: The rice stalks are partially or completely snapped off from the base, causing the yellow leaves of rice to die. Damaged rice is easy to pull up, there are no wormholes on rice stems, and no insect feces. This type of dry heart is generally prone to occur when the rice is in the field or because of prolonged drought and water in the rice fields.
(b) The "dry heart" caused by the disease. Rice virus disease and bacterial leaf blight can cause rice "dry heart". The difference between the two is:
1. Viral disease: The symptoms of dead heart are similar to the dead heart caused by Sanhuan wolfberry, but there are no wormholes on the rice stem, no insect feces, and the heart leaves are not easy to pull up. The leaves are clamped in the glass sheet to squeeze the sterile pus.
2. Bacterial blight: Most of the rice was born during the tillering period. After the onset of disease, the first or second leaves of the diseased plant were dehydrated, curled, blue-dried, and necrotic. Subsequently, other leaves gradually curled up and became blue and dry. Finally, the entire plant blade died. A small piece of fresh diseased leaf was squeezed and squeezed in a glass slide.
Second, the rice "dry heart" prevention measures
1. For the dead heart caused by the locust damage, it can be used to prevent and treat the symptomatic insecticides such as "Ruijinte", "special killing cricket" and "bug cull".
2. The dead heart caused by the damage to earthworms can be robbed and killed by rice bran mixed with "trichlorfon" when the rice is in the field.
3. For the dead heart caused by virus disease, the rice seed should be soaked with “strong chlorine†before sowing, and the prevention and control of poisonous insects such as rice planthoppers and leafhoppers should be done.
4. For the dead heart caused by bacterial blight, in addition to doing a good job of rice seed disinfection, in the early stages of the bacterial blight, should be timely spraying "Shi Bao Ling", "Ye Kuning" and other symptomatic agents to prevent and cure.
First, the simple diagnosis of rice "dry heart"
(1) "Dead heart" caused by insect pests. The main differences between the damage to rice, such as Daxie, Erhuahuai, Sanhuayu, and Chinese wolfberry, can be caused by:
1. Big cockroaches: large wormholes, many insect feces, feces generally lined between rice sheaths and stems. The stems, leaves, sheaths and leaves of the victim rice all turned yellow. The damage is heavier in the rice field and lighter in the middle of the field.
2. Insecticides: After hatching, the young larvae first clustered on the inside of the rice leaf sheath to feed on the food. The water-stained macules first appeared outside the damaged leaf sheath, and then gradually yellowed to death. The young larvae enter the rice stem after being slightly larger, resulting in the yellowing of the tip of the flag leaf of the rice and the death of the heart and leaves in severe cases. There are wormholes on the stalks of indica rice. There are few worms outside the hole and more insects in the hole.
3. Sanhua wolfberry: The larvae feed on the heart of the rice leaf first, resulting in dehydration of the heart and leaves, such as the onion tube and greenish white, commonly known as "false dry heart." The curled heart was drawn out, showing that the section was neat. If the locusts continue to jeopardize, bite off the heart and destroy the growing point, the leaves will completely die and become a "dry heart." The stem borers of the japonica rice were smaller and there were no insect feces outside the holes, and there were white fine-grained insect feces in the holes.
4. è¼è›„: The rice stalks are partially or completely snapped off from the base, causing the yellow leaves of rice to die. Damaged rice is easy to pull up, there are no wormholes on rice stems, and no insect feces. This type of dry heart is generally prone to occur when the rice is in the field or because of prolonged drought and water in the rice fields.
(b) The "dry heart" caused by the disease. Rice virus disease and bacterial leaf blight can cause rice "dry heart". The difference between the two is:
1. Viral disease: The symptoms of dead heart are similar to the dead heart caused by Sanhuan wolfberry, but there are no wormholes on the rice stem, no insect feces, and the heart leaves are not easy to pull up. The leaves are clamped in the glass sheet to squeeze the sterile pus.
2. Bacterial blight: Most of the rice was born during the tillering period. After the onset of disease, the first or second leaves of the diseased plant were dehydrated, curled, blue-dried, and necrotic. Subsequently, other leaves gradually curled up and became blue and dry. Finally, the entire plant blade died. A small piece of fresh diseased leaf was squeezed and squeezed in a glass slide.
Second, the rice "dry heart" prevention measures
1. For the dead heart caused by the locust damage, it can be used to prevent and treat the symptomatic insecticides such as "Ruijinte", "special killing cricket" and "bug cull".
2. The dead heart caused by the damage to earthworms can be robbed and killed by rice bran mixed with "trichlorfon" when the rice is in the field.
3. For the dead heart caused by virus disease, the rice seed should be soaked with “strong chlorine†before sowing, and the prevention and control of poisonous insects such as rice planthoppers and leafhoppers should be done.
4. For the dead heart caused by bacterial blight, in addition to doing a good job of rice seed disinfection, in the early stages of the bacterial blight, should be timely spraying "Shi Bao Ling", "Ye Kuning" and other symptomatic agents to prevent and cure.
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