What are the most effective ways to kill the vegetable pest red spider? What medicine is the most effective? What are the natural enemies?

Red spider, also known as cotton red spider, commonly known as big spider, big dragon, sand dragon, etc., scientific name spider mite, is one of the pests in crop production, the harm is very serious, what are the most effective ways to kill red spiders? What medicine is the most effective?

Damage characteristics

The red spider mainly harms the leaves, stems, flowers and roots of the plant, absorbs the sap of the stem and leaf of the plant, reduces the moisture of the damaged part, turns green and white, and shows dense pale spots on the leaf surface, curling and yellowing. Serious occurrence of yellow leaves, scorched leaves, rolled leaves, fallen leaves and death and other phenomena, the weather is hot and dry, especially in the case of sunny and hot days without rain, the disease is serious. The initial symptoms are chlorosis of leaves and upward curling of leaf edges, then leaves wither and fall off, resulting in bud atrophy and plant death in severe cases.

Life habits

If we want to kill the red spider, we must have a certain understanding of its life habits and grasp its weaknesses, so that we can kill it more effectively.

The red spider has a strong reproductive ability, which can occur 12-20 generations a year, with two peak periods. The first peak is from April to May and the second is from September to October. The red spider tends to be tender and green. When the new shoots grow, the harmful mites on the old leaves transfer to the new shoots. Because red spiders reproduce rapidly in high temperature and arid climate, the reproduction coefficient is large, and generations are frequent, there are four forms of eggs, young mites, nymph mites and adult mites on a leaf.

The most effective way to kill red spiders

Method 1. Red spider is treated with pepper water.

This method is also more common. Red spider disease occurs in vegetables, which can be eliminated by spraying hot pepper with water. The effect is also very good.

Chilli liquid: 50 grams of fresh pepper (or dried pepper) is mashed and 20 times the water is added. After soaking for 5-6 hours, the plant is filtered and sprayed, which can effectively control aphids, red spiders, soil silkworms and so on.

But it should be noted that all these methods should pay attention to the use of less, not too large, step by step, spraying red spiders to clean up naturally, too hasty but not good for vegetables. After the prevention and control, we should continue to spray several times to consolidate!

Method 2. Washing and bagging method

Put the potted plant down directly (be careful not to sprinkle the topsoil all over the floor), hold a water gun in one hand, and gently rub the back of the leaves with your fingers in the other. The red spider is very easy to be kneaded to death.

After washing each leaf, cover the whole plant with a large garbage bag and tie it with a rope to moisturize it, because the red spider is not tolerant of high humidity, so it can create an environment it hates.

After putting on the cover for three days, wash it again and cover it for another three days. According to practical experience, you can cure the spiders.

Method 3. Overall spraying of milk

Soak the milk with milk powder, and the concentration is less than half of the normal dosage (diluted by one to two times more).

Choose the weather with low wind to spray the whole plant sooner or later, the dosage should reach the moist state that there are milk droplets along the leaves, because the red spider will suck the milk and finally kill the red spider.

If there are not many vegetables at home and the infection of red spider is not serious, milk killing is very effective and environmentally friendly.

If the number of plants is so dense and red spiders break out, this method will not have much effect, because red spiders will reproduce again after 7-10 days!

Method 4. You can also try the other three methods:

The main results are as follows: (1) Citrus peel liquid: soak citrus peel with water for about 10 times for 1 day and night, then spray the plant after filtration to control aphids and red spiders, such as watering vegetables can control nematodes in the soil.

(2) washing powder caustic soda solution: 15 grams of washing powder, 15 g of 20% caustic soda, 7.5 kg of water, spray after mixing, 1-2 days later, the mortality rate of adult mites and young mites of red spiders was 94% and 98%.

(3) Zanthoxylum bungeanum liquid: 100g of Zanthoxylum bungeanum was boiled into 500g of water, and the plant was sprayed with 5-7 times of water, which can control aphids, red spiders, whitefly and so on.

Note: note that the best pest control activity is after 2 o'clock in the afternoon, when red spiders are basically on the leaf surface, and the pest control effect is the best.

Like illness, usually do not pay attention to the body, do not do a good job of prevention and treatment, after illness do not want to cure the disease through injections or surgery, it is basically very difficult.

Therefore, it is usually necessary to do a good job in the prevention and control of diseases and insect pests, do not wait until vegetables to the late stage of cancer to want to prevent and cure, when it is basically too late.

Natural enemies of red spiders

It has many natural enemies, such as deep mite-eating ladybug, bundle-tube mite-eating ladybug, discolored ladybug, large, small lacewing, small flower bug and so on. They play a positive role in controlling the population of insect pests.

Prevention and cure method

1. Watering regularly, because red spiders like the environmental conditions of high temperature and drought, when the field is dry, they should open holes and water in time to compensate for the water loss of plants and reduce the reproduction of red spiders.

2. Red spiders have two breeding peaks. After 3 months, attention should be paid to observation. When abnormal color of leaves is found, the back of leaves should be examined carefully, and spraying should be done as soon as possible when insect pests occur in more leaves. 22% Avi can be selected. Medicament spray control, such as 3000 times of spiroparate EC, or 2500 times of 25% acarazol EC. These agents have the characteristics of killing eggs and young at the same time, the effect of killing eggs is particularly excellent, the effective period is long, and the period of validity in production is more than 30-40 days.