How to plant sweet potatoes to prevent the harm of grubs to sweet potatoes

Drafting is the larvae of beetles, but also underground pests, control grubs, to kill beetles, can be controlled with insecticides, at the same time, to take some control measures to eliminate the pupae and larvae of its grass.

Because the grub grows in the underground soil, the adult beetle lays eggs in the soil, hatches the larvae, the larvae are relatively fat, white, and have brown patches on the head, hiding underground during the day, and coming out at night to move, biting the rhizomes of edible sweet potato seedlings. This year's sweet potato ** compared with previous years has decreased a lot, on the one hand, the sweet potato planting area has expanded, more importantly, on the other hand, the quality and appearance of sweet potatoes are very bad, grubs like to bite sweet potato seedlings and roots, is one of the biggest pests that harm the yield and quality of sweet potatoes, sweet potato seedlings are bitten by grubs will cause lack of seedlings, broken ridges, dead seedlings, and the potato pieces eaten by grubs are susceptible to infection.

Sweet potato is a crop that is more taboo with stubble, and stubble will have a higher chance of being infected with soil-borne diseases. We need to use scientific management methods to prevent and control it, and then Tianyi combines some experience of growing sweet potatoes at home, starting from the following five aspects, to see how to prevent and control the harm of grubs to sweet potatoes.

Experienced people in the countryside know that when the winter is warm, there will be more pests in the spring of the following year, and the colder the winter, the fewer pests there will be in the spring of the following year. It means that some eggs can be frozen to death in the cold winter. Therefore, spring sweet potatoes must be deeply ploughed and turned over the soil for winter, which can effectively reduce the occurrence of pests.

However, many farmer friends will say that I use more than this, but the effect is very poor, and there are still many insect eyes in the sweet potatoes harvested! Here's the secret, the reason for which manufacturer's product to use. This phenomenon is the result of a typical underground pest damage of sweet potatoes.

The source of underground pests of sweet potatoes is mainly caused by the use of organic fertilizer that has not been thoroughly decomposed and matured through high-temperature fermentation, followed by the emergence of adult insects into the soil in the natural environment to reproduce and soil-borne pests. I have been growing sweet potatoes for many years, and I have summarized some practices to prevent grubs, and I will share them with you below. The pests that bite sweet potatoes are mainly grubs, this guy has a sharp stomach and mouth, powerful teeth, and is particularly tossed, and ordinary drugs can't poison it.

When planting sweet potatoes, avoid heavy cropping, and after harvesting sweet potatoes, remove the vine residues and weeds of sweet potatoes in a centralized manner, and take them out of the field for other treatment. Before planting sweet potatoes and overwintering, the soil in the field is carefully raked to reduce the number of seedlings in the soil.

Grubs are more sensitive to light, and can use flashlights at night, or install some insecticidal lamps and other facilities to eliminate them before the beetles lay eggs. Daily attention to detect the grub in the sweet potato field, when the sprouts appear, timely manual capture, you can also put some poultry or introduce natural enemies to peck, but you need to pay attention to the time and quantity, so as not to cause damage to the sweet potato stems and leaves. The most effective and direct method is to spray pesticides, you can use about 50% octane emulsifiable concentrate 800 times, about 40% poison silk or 800 times 50% malasulfate emulsifiable concentrate, etc., sprayed once a week or so, for about a month will reduce the impact of grubs, especially in the adult outbreak stage.

Before planting sweet potatoes in spring, spring ploughing should be carried out, and after the sweet potato harvest in autumn, the field needs to be cleaned up comprehensively, and the ground should be ploughed appropriately in summer and winter, the purpose of this is to turn the eggs of grubs onto the surface of the soil, and use the sunlight and high temperature including its natural enemies to reduce the occurrence of insect pests in the later stage.

1. Physical control: Using the characteristics of adult phototaxis and chemotaxis, black lights and sexual attractants can be used to trap and kill adult grubs (beetles). Mid-June to late July is the peak period for adult worms, which is the peak season for sweet potato growth, and black lights can be installed in sweet potato fields to trap and kill adult insects.

2. Agricultural prevention and control: mainly combined with farming measures to control grubs. Potato-wheat rotation is often practiced in the northern potato area, which can be dried in the soil after the wheat harvest in early June, and the chickens can be artificially killed or raised to peck at the larvae.

In October, the summer potatoes are harvested at the same time to complete the deep ploughing of the land, which destroys the living environment of the grub in the soil, and the grub can use irrigation to eliminate the larvae by using the characteristics of the grub to be afraid of flooding.

3. Biological control: At present, the most widely used and most effective is the use of Beauveria bassiana, Metarhizium aeruginosa and other fungal preparations to control grubs, especially Beauveria bassiana in the sweet potato field to control grubs is very successful. After the application of Beauveria bassiana at the planting stage, the tuber swelling stage or the peak larval stage, the spores infected the grub larvae and made them lethal, and the fungus soil still had a certain control effect after three years of application.

This method has the advantages of low resistance to pesticides, less residue and high pathogenicity, and has broad application prospects.

4. Chemical control: This method has the advantages of fast effect, good control effect, economy and practicality, and is still the main means of controlling grubs on sweet potatoes in China.

In the sweet potato root expansion period, the roots can be irrigated with 20 times the tobacco leaf leaching solution, 3500 kg per mu, and the roots can be irrigated about 3 times in a row. This liquid is pure plant and will not cause any pesticide damage to sweet potatoes, so you can use it with confidence. It can also be applied in the sweet potato planting stage, potato tuber expansion stage or larval peak stage after the spore infects the grub larvae, making it lethal, and there is still a certain control effect after three years of fungus soil application.

One is to spray pesticides or insecticides to reduce the growth of grubs, and at the same time, it can also be well prevented in advance. Second, in the daily management of water and fertilizer, appropriate use of fertilizers containing phosphorus or ammonia to strengthen the insect resistance of sweet potatoes.

First, the best time to control grubs, around mid to early July every year is the best time to control grubs, this time is the time when its adults are in full bloom, generally from mid-June. The severity is related to soil temperature and humidity. Normally, the soil temperature is most active when it reaches 13-18, and its activity will intensify when the soil moisture is high.

2. What medicine is good for killing grubs?

1. When killing grubs, you can use 50% octathion emulsifiable concentrate, you can spray the soil mold with 10 times the water to wash, mix the soil with this agent, and then sprinkle the poisonous soil in the ditch, so that the pests can be poisoned. It is also possible to use 3% vepardan, 3% isosulfonate particles, etc.

2. In addition to mixing soil with medicine, it can also be used to mix seeds, you can choose 50% parathion, 50% phosphine, and water, and the ratio of seeds is 1:30:400, so that you can avoid being damaged after planting, and at the same time you can also treat some other pests.

3. Other control measures.

Agricultural control methods can also be used in addition to the control of drugs. In the process of farming, the organic fertilizer of unrotted Hu Bi is not applied, and the soil is pressed in time. In areas where pests are severe, the overwintering larvae are turned over to the ground to dry in autumn and winter, freezing to death or being killed by natural predators.

In addition, physical control methods can be used to set up black light traps to reduce the occurrence of insect pests.

In the process of sweet potato planting, common diseases include black spot, root rot, potato blast, etc. It is necessary to breed good varieties and pay attention to the management of the growing season to prevent diseases.

The larval grubs of the beetle gnaw off the roots and stems of the ground, causing the seedlings to wither. Needleworm bites fetal buds, young roots, and tubers, causing bare root seedlings to wither or tubers to rot. Mole crickets, bite the roots of the tubers into a mess, so that the bare root seedlings wither.

The larvae of ground tigers like to gnaw off sweet potato stems, resulting in dead seedlings and lack of seedlings. In addition, there are more than a dozen underground pests such as root bugs, root aphids, root scales, root beetles, white ants, etc., which have great damage to sweet potatoes. Sweet potato pest control:

1. Clean and sterilize the soil with quicklime. 2. Organic chemical control. 3. Prevention and control of agriculture and animal husbandry.

The larva grubs of the beetle eat the roots and stems of the ground, causing the seedlings to wither. Needleworm bites germs, young roots, and tubers, causing roots and seedlings to wither or the tubers to rot. Where conditions permit, water-drought rotation can be used to eliminate insect sources in the soil, improve soil moisture content, and inhibit the reproduction of pests.

Apply well-rotted organic fertilizer and mix trichlorfon powder insecticide to cut the transmission route of eggs.

1. Prevention and control methods of underground pests.

The control methods of underground pests can be divided into two types: physical control and chemical control. Physical control is now in place, especially for soil-borne pests. As we all know, the eggs of pests can only be safely wintered by hiding in the soil, so they only need to be deeply ploughed and turned deep after winter to destroy the hiding conditions of pests, and the eggs can be frozen to death.

That's why the colder the winter and the cooler the temperature, the fewer pests there will be in the spring of the following year.

Organic fertilizer is fully decomposed to eliminate pests**. Farmers must be fully decomposed according to the requirements when decomposing organic manure, and only after high temperature treatment can the eggs and germs in the manure be killed together, so as to reduce the pests and diseases caused by organic fertilizer. Organic fertilizer can also cause phenomenon such as seedling burning if it is not fully decomposed, which is not conducive to the growth of crops.

2. Chemical control methods for underground pests of sweet potatoes.

Chemical control methods are mainly divided into soil disinfection, seed dressing, root irrigation and other methods. Soil disinfection is mainly combined with deep soil turning, sprinkled with phosphine particles mixed evenly with the soil, and combined with pre-winter irrigation. Or when applying organic fertilizer, it is mixed with phosphine and other agents for disinfection.

Irrigating the roots is a way to kill insects. In the sweet potato root expansion stage, 30 times of superphosphate and plant ash were dissolved in water, and the supernatant was taken for root irrigation after full mixing, and the roots were irrigated once every half month. You can also irrigate the roots with 20 times the tobacco leaf leaching solution, 3500 kg per mu, and irrigate the roots about 3 times in a row.

These two liquids are pure plant and fertilizer type, and will not cause any pesticide damage to sweet potatoes, so they can be used with confidence.

3. In addition to the above methods, foliar spraying can also be used.

That is, spray sweet potato leaves with fertile leaf amino acid foliar fertilizer solution, spray once every 10 days, and spray about 3 times in a row.

The most important thing for the prevention and control of underground pests of sweet potatoes is to do a good job in crop rotation and disinfection of farm fertilizer. In addition, the main edible part of sweet potatoes is the tuber, so it is not recommended to irrigate the roots with chemical pesticides to kill insects, minimize the use of pesticides, and reduce pesticide residues.

The key is to plant sweet potatoes, taro, potatoes, and prevent and control underground pests such as early in the morning, the best way is to grow the law in the ground, and this sweet potato is to prevent pests from using some pesticides, or other should be possible.

The biological insect control method for planting sweet potatoes to prevent underground insect pests is as follows:

1. During the rapid expansion of sweet potatoes, the roots should be drenched once every 10 15 days with 25 30 times superphosphate mixed with dry and pure plant ash to leach a clear solution. Or 15 20 times tobacco leaf leaching clarifier, etc., 2 3 times in a row, each time about 5 6 kg per square meter of soil is appropriate. Or the root is drenched with 40 50 times tea bran aqueous solution, every 7 10 days, 2 3 times in a row, each time 10 15 kg per square meter.

2. During the growth and development of sweet potato, spray 1000 times Lesben aqueous solution on the foliar surface every 10 15 days, evenly spray all the leaves, and spray 3 5 times continuously with water droplets flowing down the stems and leaves to the roots.

3. You can use 1000 times of 50% phoxanthion emulsifiable concentrate to irrigate the roots, or mix 100kg of fine soil with 1000 ml of 50% phosphine octathion per mu, and evenly sprinkle it into the furrow for prevention and control when ploughing. The control of tigers and mole crickets can also be booby-trapped with poisonous bait, with 60 100g of 80% trichlorfon wettable powder, first melted with a small amount of water, and stir-fried cottonseed cake or rapeseed cake 5 7kg mixed evenly. It can also be used to trap poisonous weeds, take 25 40kg of fresh grass, grow first, mix with 50g of 90% trichlorfon and water, and sprinkle it on the ground near the roots of detoxified sweet potato seedlings in the evening.

4. Carry out chemical treatment on the seedling land, use 50 1000 ml of phosphine per mu to water 300 times, and apply it to 15cm deep soil in combination with cultivated land to strictly prevent sun exposure. When planting in the field of diseased land, under the premise of selecting disease-free healthy seedlings, 50% phosphine 1000 1500 liquid nest application. per hole.

Precautions: In accordance with the plant protection policy of prevention first and comprehensive prevention and control, adhere to the principle of pollution-free management based on agricultural control, physical control and biological control, supplemented by chemical control.

Planted every other year! Don't grow the same crop for several years in a row!

Sprinkle some carbofuran in the ground when planting.

Hello! Planted every other year! Don't grow the same crop for several years in a row!

It only represents a personal opinion, don't spray if you don't like it, thank you.

Go for nematodes that are specifically parasitic on the bodies of these insects.