Rice "dry heart" causes and prevention

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 are effective measures to ensure high yield and stable yield of rice.

First, the simple diagnosis of rice "dry heart"

1, "dry heart" caused by insect pests. The main differences between the larvae, the stem borer, the rice stem borer, the rice stem borer, and the earthworm stem borer are the following: Between stems. The stems, leaves, sheaths, and leaves of the rice were yellow. The damage is heavier in the rice field and lighter in the middle of the field.

The larvae of S. indicum show that the hatchlings of the eggs hatched on the inside of the leaf sheaths of the rice and ingested them. The water-stained macules appeared outside the damaged leaf sheaths and then gradually yellowed and died. 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.

The culprit of the Sanhuai cricket is that the young pupa feed on the heart of the rice leaf first, resulting in the dehydration of the heart and leaves, such as onion tube and blue and white, commonly known as “false dry heart”. The curled heart was drawn out, showing that the section was neat. If the locust continues to injure and breaks the heart and leaves and destroys the growing point, the heart 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.

Drought damage rice, often part or all of the rice stalk from the base, resulting in the yellow leaves of rice dead. 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.

2. 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 that the “dry heart” symptoms caused by viral diseases are similar to those caused by Sanhua rice dumplings, but there are no wormholes on rice stems. Insect excrement, the heart blade is not easy to pull up, the leaves are clamped in the glass sheet to squeeze the sterile pus.

The "dry heart" caused by bacterial leaf blight is mostly caused by rice tillering. After the onset of disease, the diseased plant heart or the lower leaves of the heart were damaged by water, curling, blue and dry, and necrosis. Afterwards, other leaves gradually curled up and became blue and dry. Finally, the whole plant leaves died. A small piece of fresh diseased leaf was squeezed and squeezed in a piece of glass. When the light was viewed, there was an outflow of yellow bacteria within the rim of the vein.

Second, the rice "dry heart" prevention measures

For the "dry heart" caused by locust damage, it can be used to prevent and treat symptomatic insecticides such as Ruijint, special killing larvae and insects.

The dead heart caused by the damage to earthworms can be killed by using poison baits such as wheat bran mixed with trichlorfon when rice falls into the water.

For the dead heart caused by virus disease, rice seed should be soaked with strong chlorine before rice sowing, and the prevention and control of poisonous insects such as rice planthoppers and leafhoppers should be well done.

For the dead heart caused by bacterial leaf blight, in addition to doing a good job of disinfecting the rice seeds, in the early stage of bacterial blight, spraying Shibaoling and Yekuning should be used to prevent and treat the disease.


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