The three major diseases of rice are harmful to rice, what are the three major diseases of rice?

The three major diseases of rice are fingerprint blight, white leaf blight, and rice blast, and if these diseases are present, they will affect the rice harvest and cause a decrease in yield.

The three major diseases of rice are rice blast, white leaf blight and sheath blight. Rice blast occurs mostly in leaves and nodes, which will cause different degrees of yield reduction, and in severe cases, it will cause white ears and end yields. Yellow-green spots appear at the tips and edges of the leaves of the diseased plants, and pale and yellow-brown long spots appear along the veins, and finally turn gray-white and die. The sheath blight plant will have dark green spots near the water surface, and then expand to a cloud shape, gray-green, and the rice cannot be headed, and the grain weight decreases.

Rice blast, which can lead to lower yields, white leaf blight, which can lead to the death of plants, and sheath blight, which can lead to lower fruiting rates.

These three major diseases refer to white leaf blight, rice blast, and sheath blight. Moreover, these three diseases are also very common, and they will also cause a certain reduction in production.

The more serious disease is fingerprint blight, rice blast, and the last one is white leaf blight, and it will also cause different degrees of loss to plants.

Rice blast, sheath blight, and white leaf blight. These are the three major hazards of rice. It can be prevented and treated in a professional way.

The three major diseases of rice are rice blast, white leaf blight, and sheath blight. These three diseases can lead to the reduction or even extinction of rice yield to varying degrees, and should be prevented in time.

We are still spreading red dead leaves, which is very serious and difficult to treat.

1. Sheath blight.

What are the common pests and diseases of rice?

The common disease of rice is sheath blight, which is generally more common in Northeast China, when the disease occurs, the stem part of the rice will appear water-stained lesions, and the disease spots will gradually spread to the upper leaves and stems in the later stage, so that the leaves will dry up and die prematurely, which will eventually lead to the decline of rice quality and yield.

2. Seedling disease.

Seedling disease is also a common disease of rice, when the disease occurs, the rice seedlings appear thin and tall, the leaves will turn pale yellow, the root system of rice will also be stunted, the disease seedlings will die when the situation is serious, and the dead seedlings can also see light red or white mold powdery substance.

3. Spike neck blast.

Rice common diseases are also ear neck blast, when the disease occurs, the cob part of the rice appears gray-black lesion area, resulting in rice can not supply nutrients, this disease is extremely serious to the damage to rice, after the onset of the disease is not timely, it is difficult for rice to grow normally.

4. Main insect pests.

There are many common insect pests in rice, such as brown rice lice, white-backed rice lice, rice leaf roller, armyworm, etc., these pests will eat the leaves of rice and suck the branches and leaves of rice.

Rice is native to China and India, and was cultivated in China's Yangtze River basin thousands of years ago. The three major diseases of rice are mainly white leaf blight, sheath blight, rice blast, and other important diseases are rice extraction disease, seedling disease, double mold disease, etc., the fundamental reason for the outbreak of disease epidemic is the increase in the proportion of high-quality susceptible varieties, the increase of physiological varieties of pathogens, and the changes in the cultivation system are in the direction of favorable to the development of diseases.

Rice pests include rice thrips, rice bracts, leaf rollers, rice planthoppers, three-way borers, etc., among which the three-way borer only harms rice and is a monophagous pest.

The main diseases of rice are: sheath blight, seedling disease, ear neck blast, white leaf blight and so on.

There are many types of rice pests and diseases, and they occur in both growing areas, from seedling fields to Honda. In recent years, some diseases have also shown a downward trend year by year, such as flax spot disease, malignant seedling disease, etc., and some diseases have a rising trend. For example, sheath blight, sheath rot, browning panicle, ear neck blast, branch blast, etc.

Hair in the field in 2018.

Four diseasesRice blast, sheath blight, striped leaf blight and black streaked dwarf

Measures should be taken to prevent and control production in a timely manner.

1.Rice blast can be divided into seedling blast, leaf blast, ear neck blast and grain blast according to the different growth period and disease site of rice. To prevent rice blast, 50 ml of 3% chito-oligosaccharide water solution and 30 kg of water can be sprayed per mu at the beginning of rice tillering.

In case of rainy weather during the peak tillering period, when diseased plants appear in the paddy field, 25 30 grams of 75% tricyclazole wettable powder, or 40 50 ml of 25% prochloraz wettable powder, or 70 ml of 3% chito-oligosaccharide aqueous solution can be used per mu, and 30 kg of water can be sprayed for control.

2.Sheath blight began to occur at the peak tillering period, mainly harming the leaf sheath of rice, followed by the leaves, forming moire lesions. It can be controlled with 300 350 ml of 5% Jinggangmycin aqueous solution, or 15 20 ml of 30% benzopropiconazole emulsifiable concentrate, or 15 20 ml of 24 thiofuramide suspension, or 50 ml of 3% chito-oligosaccharide aqueous solution, and 30 45 kg of water spray control per mu.

3.Streak leaf blight is a viral disease transmitted by gray planthoppers, and virus passivators can be sprayed at the beginning of the disease, such as 250 ml of 2% Ningnanmycin water solution per mu, or 30 grams of 50% chlorobromoisocyanuric acid wettable powder, or 60 ml of 1% lentinan polysaccharide water agent, add 30 kg of water spray, and spray 2 3 times continuously. In the early stage of the disease, it is necessary to cooperate with the prevention and control of gray planthoppers, and the applicable drugs are pymetrozine, dimidoxam, isoprocarb, etc.

4.Black-streaked dwarf disease is also a viral disease transmitted by the planthopper. The main prevention and control measures are the control of planthoppers, combined with the application of virus passivators.

At the beginning of the disease, 250 ml of 2% Ningnanmycin aqueous solution, or 60 ml of 1% lentinan polysaccharide aqueous solution, or 50 75 grams of 3% chito-oligosaccharide aqueous solution, and 30 45 kg of water can be sprayed per mu.

Pest and control methods.

1.2. Insect borer: 5-7 days after transplanting, combined with top dressing, sprinkle kilograms of insecticidal double granules per mu. At the end of July and the beginning of August, pay attention to the application of pesticides in combination with "two prevention and one spray" to reduce insect damage to the plants, so as to avoid large-scale lodging of the plants.

2.Rice locust: Before transplanting rice in the field, pay attention to the prevention and control of the seedling mother field. 7-10 days after transplanting, spray 50 kg of water with 150 ml of 25 insecticidal double water agent per mu, which can also treat early borers.

3.Rice bracts: At the end of July and the beginning of August, the rice fields with dark green leaves and greedy green and late maturing were selected and treated, and 100-120 grams of 90 crystalline trichlorfon were sprayed with water per mu. After the full heading, stop applying all medicinal fertilizers to ensure the safety of rice consumption.

4.Rice longitudinal leaf borer: when it is found that the individual leaf tips in the field should be controlled in time, 18 insecticidal double aqueous agent 200-250 ml or 90 crystal trichlorfon 100 grams per mu can be used, spray 50 kg of water, and it is advisable to apply pesticides in the evening. Treatment of early borers.

Rice bracts: At the end of July and the beginning of August, the rice fields with dark green leaves and greedy green and late maturing were selected and treated, and 100-120 grams of 90 crystalline trichlorfon were sprayed with water per mu. After the full heading, stop applying all medicinal fertilizers to ensure the safety of rice consumption.

How to control rice pests and diseases? Let's talk about it, old farmer! Common diseases of rice include bacterial leaf spot, rust, sheath blight, and rice blast.

Powdery mildew, root rot at rice tillering stage, and so ......on. Prevention and control of diseases pyraclostrobin.

Add spring leimycin, and start the drug with rice sealing, once every fifteen days. Rice insect pests include rice planthoppers, two borers, three borers, and aphids.

Rice roll worms, thrips.

And so on, the drug ** has ethyl spinosadin, aphid lice net, or emamectin benzoate.

Add insect mite light. Rice blast occurs with rice blast**, and there is red leaf disease, red leaf disease**, copper loamine, striped leaf blight. Insect control should also be carried out, the pests of rice insect pests have two types of exogenous pests and endogenous pests, exogenous pests are long-distance migratory pests, such as brown rice lice, white-backed rice lice, rice leaf roller borer, armyworm, etc.

Endogenous pests are local insect sources that breed locally, such as the three borer, the two borer, the big borer, the gray planthopper, the rice thrip, etc.

The yellowing of the roots at the tillering stage of rice is the early stage of the saying called "seat pocket", which is the phenomenon of planting roots, gradually turning black, not hairy roots, and the leaves are dark and green, gradually dwarfing and yellowing, withering until they rot and lack seedlings. Drying the field is the basic means, the use of seedling tray seedlings thin water throwing seedlings can also be avoided, a small range can be artificial cultivation of the field, that is, cultivation, the roots around the floating mud picking, combined with the field can be restored. Under the foot of rotting organic fertilizer or chemical fertilizer as base fertilizer, after slowing the seedlings in a timely manner to chase a small amount of seedling fertilizer seedlings, or the amount of fertilizer in the whole growth period minus the amount of basal fertilizer after one-time application, but the sandy texture or over the paddy field to a small number of times, the general principle is to promote early growth and rapid development, most of the later no longer fertilize, to prevent greedy green to affect the seed setting rate and increase pests and diseases, only depending on the seedling situation in the break, full ear and chicken mouth yellow combined with the appropriate amount of pest control urea and potassium dihydrogen phosphate.

Foliar fertilizer to promote fullness of the seeds.

Rice koji disease is more serious, and this disease harms rice grains and needs to be paid attention to. Farmers should be sprayed with pesticides to prevent and control rice koji disease 2-3 times at the end of rice booting and heading stage. Scientific fertilization is also important. Farmer friends who plant rice should apply farmhouse fertilizer (green manure.

Chemical fertilizer, chemical fertilizer to compound fertilizer.

Trace element fertilizer is the main fertilizer, and nitrogen fertilizer should not be applied partially. From my observational research, scientific fertilization can effectively increase the disease resistance of rice and increase rice yield. In addition, rational dense planting and irrigation can also increase the disease resistance of rice and increase rice yield.

Farmer friends should master these techniques.

Streak spot, white leaf blight, seedling disease, sheath blight, rice blast, etc., these are common diseases, and they also affect the yield of rice very much.

Rice blast, stripe spot, white leaf blight, seedling disease, sheath blight, these are relatively serious diseases, and they must be prevented and treated in time.

Rice blast, rice sheath blight, rice leaf blight, rice bacterial stripe spot, rice seedling disease, rice koji disease.

What kind of disease is rice?

Rice diseases can be divided into two categories: non-infectious diseases and infectious diseases. Non-infectious diseases are induced by unsuitable growth conditions or the influence of harmful substances in the environment, and are not infected by other organisms, so they cannot be transmitted to each other. Such as rice cold and heat damage, rice deficiency disease, rice red blight.

Infective diseases are caused by pathogenic organisms infecting hosts and are contagious. Such as rice blast, seedling disease, rice white leaf blight.