Do you know what are the common pests and diseases in the middle and late stages of rice?

The common pests and diseases of rice are divided into two categories: diseases and insect pests, among which the main diseases are rice white leaf withering and rice seedlings and rice sheath blight. There are five kinds of insect pests: two borer, three borer, big borer, rice leaf roller borer, and rice planthopper.

Sheath blight is a decrease in rice's own immune system, weakened insect resistance, powdery mildew, mold disease, and rice blast.

I think there will be scab, powdery mildew, rust, wilt and sheath blight.

Mold rot often occurs in rice in the middle and late stages of growth. It is a disease that occurs due to poor weather conditions and poor permeability. Therefore, we should pay attention to the field management of rice in the middle and late stages.

It can be decided whether to control or not according to the amount of insects in the field; Rice koji disease must be sprayed in advance to prevent, if not sprayed to prevent, rice koji disease is easy to epidemic in rainy weather in the later stage, resulting in a significant reduction in rice yield; For poor field management and susceptible rice blast varieties, rice blast should also be sprayed in advance to prevent it. Timely spraying prevention is the key measure.

It is recommended to use tebuconazole, oxime tebuconazole (dichloroconazole), enazole, fluconazole and oxime amine in time about 10 days before the rice breach (when the booting belly is obvious). Tebuconazole, wells. Alkene.

Spraying prophylaxis of cycloazole, Bacillus jinggang, Bacillus cereus, prochloraz, benzoxystrobin and other agents.

It mainly controls the two borers, as well as leaf rollers, rice planthoppers, three borers, moths, etc. We mainly use pesticides, avermectin, insecticidal bis, imidacloprid and at the same time prevent the occurrence of rice blast by using zeazole.

It is easy to remove insects, basically after two hours, the insects will die, basically to harvest will not be infested again, generally can be used 15-20 ml 19% per muChlorworms. Trifluorobenzene, 11% avi.

Trifluorobenzene, 23% broma. Trifluorobenzene, or Fugo and other spraying control, the effect is good, and at the same time, it can also be very good for pests such as borer. During the rice filling period, the water layer in the field is shallow or there is no water, and the water consumption should be increased when spraying.

Sheath blight is one of the most common diseases in the middle and late stages of rice growth. Sheath blight is a fungal disease, which mostly occurs in the late tillering stage of rice to the heading stage, and the infection site of the disease gradually spreads from the bottom of the initial rice stalk to other parts, and the most serious part will extend to the panicle part of rice. In order to give full play to and improve the prevention and control effect of pesticides and reduce the negative impact of strong light and ultraviolet rays, it is recommended to use drugs in the evening, and it is strictly forbidden to apply pesticides in the field at noon.

Pay close attention to the weather conditions, try to avoid medication during rainfall periods, and immediately increase the dosage of medicine for supplemental treatment if you encounter moderate or above rainfall within 4 hours after prevention and treatment.

The main pests in the late growth stage of rice are white-backed whitefly, brown whitefly, armyworm and rice leaf borer, which have long-distance migration and suddenness, and should pay attention to timely control of rice borer.

For example, there are rice sheath blight, rice blast, rice borer, rice black-streaked dwarf disease, rice planthopper, rice leaf roller borer, etc., these are some of the pests and diseases that appear in the middle and late stages of rice planting.

Rice blast, rice white leaf blight, bacterial stripe spot, rice koji disease, rice planthopper, rice borer, and rodent pests are all to be controlled.

In the later stage of rice growth, the prevention of some pests and diseases is very important, especially the prevention of aphids. Also, pay attention to the weather forecast to prevent common natural disasters.

In the middle and late stages of rice, it is necessary to control insect pests such as rice planthoppers, rice borers, rice armyworms, rice bracts, and rice leaf rollers.

There are three main types of pests and diseases in the middle and late stages of rice: the first is brown planthopper; the second is ear neck blast; The third is the three-chemical borer.

What are the pests and diseases at the seedling stage of rice? Rice seedling pest control methods!

Disease prevention and control work is required at the seedling stage to ensure strong growth and high-quality rice ears in the later stage.

So what are the pests and diseases at the rice seedling stage? How to control pests and diseases at the seedling stage of rice? Today, I will share with you the methods of pest and disease control at the seedling stage of rice, let's take a look!

1. Gray planthopper.

Planthopper gray is a local overwintering insect source, which not only stings and sucks rice juice, but also transmits viral diseases in the field, especially rice stripe leaf blight occurs in the field after rice transplanting, affecting the growth of green tillers.

Planthopper prevention.

Gray planthoppers can generally be in the spring, pay attention to timely cleaning up the weeds at the edge of the ditch in the field, or spray chlorpyrifos and other agents can reduce the occurrence base, combined with the wheat ear stage of one spray and three prevention and wheat field gray planthopper prevention, can avoid wheat harvest after the gray planthopper migration to the rice field.

Rice pre-sowing thiamethoxam or imidacloprid conventional pesticides can be effectively prevented.

When there are more than 40 adult planthoppers or more than 80 nymphs per square meter in the rice seedling field, and more than 500 heads of 100 bushes in the field, 30-40 grams of 10% imidacloprid or 18-20 grams of 25% pymetrozine mixed with 30 kg of water are mixed and sprayed for control in a timely manner.

2. Thrips. In recent years, thrips have a tendency to aggravate the damage to rice in our land, especially in direct seeding paddy fields, which usually causes leaf tip water loss and longitudinal roll drying; When the cuttings occurred severely, the rice seedlings returned to green and tillered slowly.

Usually during the rainy season, when there is a lot of rainy weather, the occurrence is serious.

And the field with good growth is prone to occur.

Thrips prevention. Thrips in winter and spring technology to eradicate the field and the surrounding ditch weeds, can eliminate the source of overwintering insects, before sowing celery starvation conventional imidacloprid and other pesticides seed dressing prevention is better, strengthen the field management at the seedling stage, cultivate strong seedlings, can enhance insect resistance.

Methods of thrips medication.

When the rice leaf curling plant rate is more than 10% in the seedling field and 20% in the field, it is necessary to use 25% thiamethoxam 2000-2500 times per mu in time, or 20% carbosulfan 1500 times solution, or carbosulfan butadiene mixed with imidacloprid and other agents to be sprayed alternately in rotation.

3. Rice weevil.

The larvae eat the root system, resulting in yellowing and death, and the adults are harmful to the heart leaves, and there is a row of horizontal rows of small holes behind the leaves.

Rice weevil prevention.

Generally, the weeds on the edge of the ditch are eradicated in spring, the paddy field is ploughed and harrowed, and the residual adult larvae in the field are destroyed, combined with pesticide dressing for prevention.

Methods of rice weevil: When the field is found to be harmful, 50% pine borer 800 times liquid, or trichlorfon or chlorpyrifos or Arica are used for prevention and control.

Common insect pests include sheath blight, rice blast, rice koji disease, seedling disease, bacterial base rot, black streaked dwarf disease, bacterial wilt, dry tip nematode disease, sclerotinia sclerotinia disease, flax leaf spot, and red blight.

The pests and diseases that will be encountered are sheath blight, seedling disease, ear neck blast, brown rice lice, armyworm, white-backed rice lice, which are all common pests and diseases.

Common rice pests and diseases include sheath blight, rice koji disease, downy mildew, leaf sheath rot, bacterial stripe spot, rice leaf roller, etc.