Why do sun dried rice grow rice planthoppers?

Rice planthopper is one of the common pests in the growth process of rice, it is very harmful to rice, and if it is not controlled in time, it is easy to cause yield reduction.

There are many types of rice planthoppers, such as the common gray planthopper, white-backed planthopper, brown planthopper, etc., these three are also relatively common, basically in the process of planting rice, its size is relatively small (as shown in the figure below), I believe that friends who plant rice can distinguish it.

Rice planthopper is a kind of stinging and sucking pest, so to suck the juice of rice, sometimes a rice, there can be a lot of rice planthoppers, causing the leaves to yellow and dry, serious direct death, another way of harm, is to spread the disease, under normal circumstances, rice planthopper transmission stripe leaf blight is more powerful, under the attack of pests and diseases at the same time, if not timely control, there is only to wait for the yield to be reduced.

The peak period of rice planthopper occurrence generally has two growth stages, the first is before rice transplanting to jointing and booting, and the other is the time period from rice heading to the early stage of grain filling, so during this period, the prevention and control of rice planthopper should not be taken lightly.

With the occurrence of rice planthopper year after year, we still have some experience in the prevention and control of it, but there are also disadvantages, that is, the resistance of rice planthopper is increasing year by year, some friends reacted that the drug used in the year before was not bad, but when it was used again last year, the effect has been discounted, due to the occurrence of rice planthopper in different regions, the degree of outbreak, and drug resistance are different, and there are differences in the selection of pesticides.

In general, the more commonly used agents for the prevention and control of rice planthoppers are dimidoxamin, etmethrin, fenvalerate, deltamethrin, thiazinone, pymetrozine, etc., according to the specific situation to choose the appropriate local agent, in addition, when spraying, to tell you, due to the high temperature, it is recommended that the amount per mu remains unchanged under the premise, more water, thorough, as far as possible to spray the liquid medicine on the whole plant of rice.

Finally, let me tell you an experience, if in the process of planting rice, there is more rain in the early stage, and when it is drier in the later stage, the occurrence degree of rice planthoppers will increase (this is just an experience, it may not be suitable for all areas, you can understand it), and the explanation of rice planthoppers in rice

Rice planthoppers appear in sun-dried rice because the rice has adhered to the millet or the barn where the rice is stored when the rice is harvested, and hatches in a suitable environment.

This is because the rice is too dry. It also shows that this kind of rice is of good quality and can be eaten with confidence.

It may be that if you put it for too long, there will be insects, and the warehouse that used to collect enough grain was to spray pesticides! We didn't spray what we ate ourselves, so the adult bugs became planthoppers.

Hello, the harm of rice planthoppers.

1. Hazards: Absorbing nutrients and water from rice plants, the field first appears yellowing and shrinking for a long time, and then withers, which is called perforation, or puncture. If not prevented in time, it will spread to the whole field within a few days and expand to the surrounding fields.

When the rice planthopper outbreak occurs, the black pressure on the rice plants in the field is full of adults and nymphs, like a pumping machine to suck the water and nutrients of the rice plants, and the whole field is dry, even if the rice is mature and not harvested, the whole field is dried up and lodging in a short time, and it cannot be harvested.

2. Characteristics: long-winged females are long, short-winged are long, light yellow-brown to gray-brown, the top of the head is slightly prominent, the length is slightly greater than or equal to the distance between the two compound eyes, the frontal area has 2 black longitudinal grooves, and the frontal ridge is arc-shaped.

Prothorax dorsal plate, antennae pale yellow. The small shield is yellowish-white to yellowish-brown in the middle, with half-moon-shaped brown stripes on each side, the dorsal plate of the midthorax is black-brown, the forewings are more transparent, and there is 1 brown wing spot in the middle. The eggs are milky white and slightly transparent when first laid, and later turn pale yellow, banana-shaped, and arranged in double rows.

The last instar nymphs have long bodies, and the forewing buds are longer than the hind wing buds, and the nymphs have a total of 5 instars.

The cold-tolerant ability of the white-backed planthopper is stronger than that of the brown planthopper, and the wintering area is slightly wider, and the southern part of Hainan Island and the southernmost area of Yunnan are the year-round breeding areas, and the warm winter year of the northern boundary of wintering is about 26 north latitude.

Causes of occurrence of rice planthopper in rice:

1. The influence of wind.

The adults of rice planthoppers can be divided into two types: long-winged and short-winged, and the body characteristics and colors of long-winged and short-winged are very different. It is a migratory pest that does not usually stay locally and generally uses wind to migrate from southern regions, mainly to survive and reproduce on rice. In the summer, when the wind is more frequent, the migration of rice planthoppers is greater.

Second, the influence of humidity.

The rice planthopper has a high reproduction rate and is relatively dry in early spring, which creates favorable conditions for other rice pests to overwinter, and at the same time, its reproduction rate is relatively fast. In the later period, the precipitation increased and the temperature rose sharply, which provided favorable conditions for the survival of rice planthoppers. The suitable living conditions for rice planthoppers are:

The temperature range is 15-25 degrees and the humidity is around 80%-85%.

3. Influence of cultivation methods.

In the process of rice cultivation, some man-made conditions can also cause rice diseases and pests. When planting rice, some farmers do not strictly follow the standardized planting methods and do not pay attention to the setting of rice row spacing.

Nowadays, rice planting has realized mechanization, if the row spacing of rice is too small, it will cause the partial development of rice rhizomes to be stunted, resulting in poor ventilation of rice fields, and the water replenishment of rice is too frequent, virtually create favorable conditions for the survival of rice planthoppers, increase the number of rice planthoppers, and is not conducive to improving the yield of rice.

Good morning, there will be. In the rice tillering stage, the monitoring and field investigation were strengthened to monitor the occurrence of rice planthoppers, and 25% pymetrozine and thiazinone suspension were used to spray at the peak stage of the young nymphs of the main pest generation. For rice planthopper standard fields, it is advisable to choose permethrin or dinotefurin or clothianidin or trifluorophenyl and other sensitive agents to rice planthoppers, when the number of rice planthoppers is large, Yi Naxiang first use isoprocarb and other fast-acting agents, or permethrin plus enylpyritrazine or halodipyr and other compound agents to quickly reduce the density of insect population, about 5 days after the drug in the spraying control.

The occurrence law of rice planthopper is high temperature for a long time, or continuous temperature, rain for a long time, prevention and control methods, spray with lice book pants powder in advance, or spray with 25% pymetrozine and thiazinone suspension. The occurrence of rice planthoppers is regular, and it is easy to suffer from rice planthoppers during the growth period of long-lasting high temperature and drought, or high temperature and high humidity in the field. It can be controlled with imidacloprid or pymetrozine.

Rice planthoppers swarm rice bushes with adult baigues and nymphs

The basal part sucks the sap of the leaf sheath and the stalk of rice, and yellowish-white to brown spots appear on the affected part, which then decays and lodging; Planthoppers cut through rice tissues with ovipositors to lay eggs in them, causing mechanical injury; Planthoppers can carry and transmit rice viruses and cause rice virus diseases.

There are two serious damage periods for rice planthoppers, namely late July to early August and early September, especially in the early stage, which coincides with the rice booting and heading period, with good nutritional conditions and a sharp increase in insect volume, which can cause serious harm. Rice planthoppers lay eggs in the hypertrophic tissues of leaf sheaths** near the water surface, with an average of 60-700 eggs per female. There are two types of rice planthoppers: long-winged and short-winged, the long-winged type can migrate over long distances, and the short-winged type cannot migrate long distances, but once it appears in large numbers, it is an omen of planthopper outbreaks.

Rice booting to milk maturity period, such as temperature 22 -28, humidity 80 -85, is conducive to the occurrence and harm of planthoppers, especially after rain, high temperature is conducive to the occurrence of planthoppers. Low-lying terrain and partial application of nitrogen fertilizer can promote the occurrence and harm of planthoppers.

Keep the environment dry and keep the storage area tightly sealed so that rats don't come in. Use calamus, pepper and other plants to control pests in stored rice. Mixing plant ash with about 30% of the weight of grain and rice can effectively control insects and mites.

Husk (chaff) is a white powder with high silicon content after full combustion, and its insecticidal and insect-proof effects are much better than those of plant ash when mixed with rice. Diatomaceous earth is a natural insecticide for stored grain pests, mixing it with grain, can effectively control stored grain pests, the common dose is 1g per kilogram (1000 grams) of grain.

Garlic storage is one of the many ways to prevent rice insects. Peel the garlic and put it in a bag with the rice, which can play the role of sterilization, moth repellent, and inactivated powder mites.

In addition, star anise can also play a similar role, but it is best to break it by hand before releasing the rice to make it more obvious.

Which part of the rice planthopper mainly harms?

Rice planthoppers generally hide in the leaf sheaths and stem tissues of the lower part of the rice plant in the middle of the rice field. Rice planthoppers have stinging and sucking mouthparts, which can suck the sap of rice through their mouthparts, thus interfering with the distribution of photosynthetic products of plants, resulting in less nutrient acquisition by their roots, and also accelerating the senescence of leaves. The lower part of the rice plant may also turn black, rot and smell, lodging, and die.

The prevention and control methods are as follows:

For rice planthoppers, 10 grams of 25% profenoxine wettable powder and 20-30 grams of 10% imidacloprid wettable powder can be used for spray control with 50 kg of water during the peak period of nymph occurrence, and 30-40 ml of 5% fipronil gel suspension can be used for spray control with 50 kg of water. Pay attention to the water layer of about 5 cm in the field when applying pesticides, and avoid applying pesticides at noon in hot weather.

Rice planthopper is suitable for growing at a temperature between 15 and 30 degrees, and the best breeding temperature is between 20 and 30 degrees, and the rice planthopper will enter the overwintering state in winter, in the process of controlling rice planthopper, it is necessary to use rice varieties with strong insect resistance, and it is also necessary to spray pesticides for rice regularly to eliminate the rice planthopper larvae.

1. Optimal temperature

The optimal temperature for the growth of rice planthoppers is between fifteen and thirty degrees, and the optimal temperature for reproduction is between twenty and thirty degrees, if the temperature is higher than thirty degrees, it is not conducive to the development and growth of rice planthopper larvae, and at the same time, when winter comes, rice planthoppers will enter the overwintering state and reappear in the spring of the next year.

2. Select the variety

When rice planthoppers invade rice, they will mainly choose varieties with poor insect resistance to invade, so in the process of controlling rice planthoppers, it is necessary to plant rice varieties with strong insect resistance, or soak rice seeds in insecticides before planting to improve the insect resistance of seeds.

3. Drain water regularly

In the process of maintaining rice, in order to avoid the plant being attacked by rice planthoppers, it is also necessary to regularly discharge water for the rice, so that the plant stalk is exposed to the water surface, and the stalk is kept thick, and the growth state of the rice needs to be observed regularly to avoid large-scale insect pests in the plant.

4. Use chemicals

In the process of controlling rice planthoppers, pesticides can also be used. At the rice heading stage, it can be sprayed with diluted imidacloprid solution to eliminate the rice planthopper larvae on the plant, and at the end of the rice panicle, the rice can be sprayed with dichlorvos agent or rapid dicarb agent to prevent and control the reproduction and growth of rice planthopper.

<> rice planthopper can only survive for four to six days, among which the adult rice planthopper will die after four days of this lack of relatives, and the larvae will die within six days, in the process of controlling rice planthopper, it is necessary to select rice varieties with strong insect resistance for planting, and at the same time, it is necessary to spray insecticides regularly for rice to make it grow healthily.

1. Four to six days.

Rice planthoppers can live for four to six days. Because adult rice planthoppers will complete the task of reproducing and laying eggs within four days, and thus die, and larvae or old worms, within six days, will also die due to lack of food. At the same time, over the course of a year, rice planthoppers can continue to multiply to.

Ten. 6. Seventeen generations.

2. Select varieties.

Rice planthoppers mainly invade the quality of rice with weak insect resistance, so in the process of controlling rice planthoppers, it is necessary to choose rice varieties with strong insect resistance for planting, and before rice seedlings, the seeds can also be soaked in insecticides or fungicides to improve the insect resistance of seeds.

3. Spray the agent.

After rice transplanting, it needs to be sprayed regularly to destroy the bacteria on the plant. At the same time, at different stages of rice growth, different agents are used, imidacloprid wettable powder can be used at the rice heading stage, and at the end of the panicle stage, sulfazcarb wettable powder can be used.

4. Biological control.

In addition to the use of pesticides to control rice planthoppers, biological control methods can also be adopted to protect the natural enemies of rice planthoppers, and the natural enemies can be used to control the reproduction rate and number of rice planthoppers, and ducks can also be raised in the rice field, so that ducks can peck at rice planthoppers to ensure the healthy growth of rice.