What pests do you need to pay attention to when rice is headed? What kind of medicine to take?

Combined with the actual situation of rice planting in the region, perfect prevention and control measures were put forward in a targeted manner. This paper proposes specific control strategies for the main types of rice diseases and insect pests, and provides technical support for farmers to ensure the continuous improvement of rice planting yield. In the process of rice planting, the yield will be affected by pests and diseases.

In the process of effectively studying rice planting technology, agricultural technicians should actively enhance their understanding of the prevention and control of rice diseases and insect pests, and effectively carry out scientific prevention and control of relevant diseases and pests. <>

The main diseases of rice disease prevention and control technology under the new situation: rice blast is one of the main diseases of rice, also known as rice fever. Once this condition appears, it can cause great harm to the growing area.

This disease is mainly caused by fungal parasitism, and the virus carried on rice will spread in the air, which is a relatively difficult rice field disease. The spores produced are spread by natural conditions such as wind and rain, and once the disease occurs, it spreads in a wide range with the pathogen as the center.

Control measures: Before the seeds are put into the ground, the seeds need to be dried in advance, and the seeds need to be dried in direct sunlight to kill all kinds of miscellaneous bacteria in the seeds. After that, the dried seeds are placed in 1% lime water, soaked for a period of time, rinsed with water, and germinated and sown.

If conditions permit, the corresponding reagent can be used to soak and clean, such as 70% methyl tobuzin wettable powder 500 times or 50% carbendazim wettable powder 250 times. If the cleaned seeds show symptoms, spray the above agents at the appropriate concentration according to the degree of symptoms to ensure that the virus is completely eliminated before sowing. <>

Symptoms: The pathogen will spread further in a fan shape with the "assistance" of running water. Compared with uninfected rice, rice infected with this pathogen has less heading, produces more grain, and the kernels are not very full.

The reason for the emergence of this disease is related to the lack of proper management in the past. For example, nitrogen fertilizer is not applied according to standard measurements; During rice planting, frequent irrigation or over-spacing of rice seedlings in order to obtain higher yields is achieved. All of the above behaviors will cause rice sheath blight and cause direct economic losses.

Control measures: First, appropriate rice management measures should be formulated according to the area and scope of paddy fields to solve the problem of bacterial residues from the root. According to the regional planting area, reasonable calculation of fertilization, and ensure that the time of additional fertilizer is appropriate, not too much nitrogen fertilizer, can be applied more phosphorus, potassium fertilizer, to ensure the balance of nutrient supply.

When irrigating, it is necessary to follow the principle of shallow before, dry in the middle, and moist after the water, so that the rice can obtain sufficient water for a long time. Secondly, the appropriate use of chemicals to block germs. When the rice is in the heading stage, the middle and lower parts of the rice can be sprayed with the corresponding agent in advance to prevent the germs from breeding.

At the same time as spraying the agent, it is necessary to use an appropriate amount of occultamine acetate and methamethaline.

Rice blast can occur from seedling stage to rice ear filling stage, mainly harming leaves and ear neck, and is called rice panicle blast in the later stage. And rice grain blast, the occurrence of panicle disease blast symptoms, the ear neck appears black lesions, after the whole panicle becomes white spike, the grain blast disease of rice husk grains become white to form a grain, the disease can make the rice grains black, seriously affect the yield and quality of rice, the best time for prevention and control is the rice ear break out of the stage, and the full ear stage of each spray once the drug, pesticide control.

1) Rice borer, also known as borer, belongs to the family Lepidoptera. It is the main pest of rice in southern China.

harm the rice at the seedling stage and tillering stage, causing withered seedlings; harm the rice at the booting stage, causing dead ears; Harm the rice at the heading stage of the breach, resulting in white ears.

2) Control measures Agricultural measures: focus on eliminating overwintering larvae in winter, in the peak period of pupation in spring, irrigation and flooding of rice roots for 3 days, killing overwintering insect pupae in rice stubble, and light trapping adults.

What medicine to apply at the full heading stage of rice should be decided according to the growth situation, if the rice has no signs of yellowing, it is necessary to spray the ripening drug in time; If it is found that there is leaf sheath browning, stalk rot sclerotinia or flax spot and other diseases, it is necessary to spray fungicides in time. The suitable prevention period for flax spot disease that rice is prone to is the rice full heading stage, which can be treated with spring leimycin, and if it is stalk rot sclerotinia disease, rice blastamide tebuconazole, or thiafamide suspension can be used to prevent and control it.

1. What kind of medicine should be injected at the full heading stage of rice.

1. What kind of medicine to take at the full heading stage of rice should be decided according to the growth situation. If the rice does not show signs of yellowing, it is necessary to spray the ripening drug in time. If it is found that there is leaf sheath browning, stalk rot sclerotinia or flax spot and other diseases, it is necessary to spray fungicides in time.

If insect pests are found, such as rice leaf rollers, armyworms, and rice borers, spray pest control drugs. At this stage of rice heading stage, it is necessary to strengthen management and provide a suitable environment for rice.

2. Flax spot disease: generally it is a plot lacking in fertilizer and water, especially in potassium deficiency, acidic soil, sandy soil, and muddy soil. The best prevention period is to use drugs such as spring leimycin and tricyclazole or use triumph water-soluble fertilizer at the full heading stage of rice.

3. Stalk rot sclerotinia disease: it occurs in the lower part of the rice stalk, forming black-brown linear lesions on the stem, and the severe stem will turn black and rot, resulting in rice lodging and rice grains shriveling. The full heading stage of rice is the best time to prevent and control the disease, and drugs such as rice blastamide tebuconazole, or thiofamide suspension can prevent and control this disease.

Second, when is it good to spray rice when it enters the full heading stage?

1. The spraying time of rice at the full heading stage is generally carried out when 80% of the plants are headed, which is the best period for the prevention and control of sheath blight, rice blast, rice planthopper and other pests and diseases. When spraying, you need to pay attention to avoid the high temperature period at noon, generally spray before 10 am and after 3 pm, if there is rain within 3 hours after spraying, you need to make up for it.

2. It is best to use a variety of pesticides alternately when spraying pesticides at the full heading stage of rice, so as to avoid drug resistance, and the effect is better if compound pesticides can be used. The spraying time is selected in sunny weather without wind or rain.

3. When there are pests and diseases in rice, we must prevent them as soon as possible, and do not miss the best time, so as not to affect the yield of rice. When applying pesticides to rice, you can choose to use drugs such as tricyclazole, rice blast, fluconazole, etc., and one agent can often target a variety of diseases.

At the rice stage, it is advisable to use chunleimycin, pyrazoxystrobin, rice blastamide, etc. Plenty of water. In order to spray evenly and thoughtfully.

You can choose to use imidacloprid, this drug has a good effect on fish and rice bracts, and it is generally enough to spray twice**.

You can use Qiansheng mu, trichlorfon crystal mu, and emamectin salt mu. These medicines are effective in the cultivation of rice bracts.

Trichlorfon crystals should be used for this medicine, which is particularly effective, and it can also prevent this disease, which is very good.

5-7 days before the rice breakage, chlorantraniliprole or emamectin benzoate + pymetrozine or thiamethoxam + benzopropazole or fluconazole + rice blast + tricyclazole + potassium dihydrogen phosphate + organosilicon can be sprayed. Spray again after the rice is full headed.

During the rice breakage period, the focus is on the prevention and control of rice sheath blight, rice koji disease, rice blast, rice longitudinal curl leaf borer, borer, and rice planthopper.

At the full heading stage, it is necessary to prevent and control sheath blight, rice blast, rice planthopper, and heart worm;

Thiafuramide, fluconazole, hexaminol, benzome. propiconazole, azoxystrobin;

Rice blast can use rice blast, rice blastamide, tricyclazole;

To control sheath blight, rice blast, rice planthopper and borborer sheath blight at the full heading stage, thioframide, fluconazole, hexaconazole and benzozole can be used. Propiconazole, azoxystrobin rice blast can be used for rice blast, rice blastamide, tricyclazole.

Rice planthoppers can use dinotefuran, endidine. Pymetroz, permethrin. Pymetrozine borgonidium with chlorantraniliprole, Bacillus thuringiensis, fenozazide, etc.

If the rice does not have heading, it may be due to insufficient fertilizer and water, or too much pesticide spraying.

Potassium fertilizer, phosphate fertilizer, and brassinin can be sprayed.

Rice cultivation techniques.

The crop likes high temperature, humidity and short daylight, and has low requirements for soil.

The south of China is the main producing area, and the northern provinces are cultivated.

1. Seed treatment.

Seed treatment is a prerequisite in planting technology, generally before planting, the selected seeds are cleaned and disinfected in potassium permanganate solution, and then placed in a mesh bag for germination treatment, and the temperature can be maintained at about 30 to germinate quickly.

2. Land preparation treatment.

To ensure the fertility of the cultivation medium, generally in the land preparation should be combined with the cultivation and weeding treatment, and then add an appropriate amount of organic fertilizer and superphosphate, potassium sulfate and other fertilizers to the soil, mix and stir together to evenly remove the silver base, and then add a small amount of Dixone for sterilization.

3. Transplanting treatment.

The germinated seedlings are transplanted into the soil, do not cultivate too densely, keep the plant row spacing at about 10 cm, hold the seedling roots by hand, and insert the root system into the soil.

4. Post-planting treatment.

If there is a lack of seedlings after planting, it is necessary to replenish the seedlings in time to ensure the original planting density, and frequent irrigation treatment is required during the growth period.

5. Weeding treatment.

It is best to carry out weeding treatment frequently after planting, and herbicides can be applied to it one week after planting, mainly oxatrione, and when the growth is better, benzylthioyl herbicides can be added to the fertilizer to mix and spray to avoid weeds affecting the normal growth of plants.

1. Appropriate period for prevention and control: The peak period of egg incubation and the young larval stage in the field of rice bracts should be strictly controlled, that is, from July 29 to August 6, the best period for pesticide application and control.

2. Prevention and control objects: growing tender green, late planting and late development, late planting, and seed production of female paddy fields, all of which are key prevention and control target fields.

3. Protect natural enemy resources, prohibit the application of highly toxic pesticides, improve the parasitism rate of eggs, larvae and pupa, and control the damage with benefits.

4. Pesticide control: 50 grams of rice bracts are used in 8000 mu, 100 grams of 90% trichlorfon crystals per mu or 30 ml of emamectin salt per mu are mixed with 40 kg of water, and conventional spraying is used with a manual sprayer, or 10 kg of low-volume spraying with water with a motorized sprayer.

Fertile leaf amino acid foliar fertilizer can be appropriately applied to enhance resistance.