CATDOLL : CATDOLL: How to deal with red spider mites on Oxalis

1. How to deal with red spider mites on red sorrel

Red Soilgrass is managed extensively, with few diseases and insect pests, but it is afraid of red spider mites. Once the area of ​​invasion is large, the effect of drug control is not great, which is a headache for growers. Some places simply give up Red Soilgrass and use other ground cover plants instead. Why is the drug control effect not good? Is there a solution? For several years, I have been paying attention to this issue and have conducted a lot of experiments and explorations. I think there are two reasons for the large-scale occurrence of red spider mites in Red Soilgrass: 1. Ignoring the early observation of red spider mites. Especially in late autumn and early spring, when a large area of ​​leaves turn yellow, it is always thought to be caused by weather reasons. It is not realized that it is the harm of red spider mites, and the best prevention and control time is missed. When it is realized that it is the harm of red spider mites, it is too late. Even if high-concentration pesticides are repeatedly sprayed, it is difficult to work. Because the yellow leaves cannot turn green again, they can only grow new leaves, but repeated spraying of high-concentration pesticides will make red spider mites quickly develop drug resistance, making it impossible to use drugs for future prevention and control. 2. The main natural enemy of red spider mites in Red Soilgrass is carnivorous red spider mites. The two insects that connect the food chain are of the same type, which means that when using drugs to control the problem, the herbivorous spider mites are not killed, but the carnivorous spider mites are killed. To deal with this herbivorous spider mites, the following methods can only be used: Carefully conduct regular insect observations because the spider mites that harm the red flower sorrel cannot fly and can only spread by crawling and with the help of wind, so its spread occurs from point to surface and gradually expands. The initial damage speed is limited, and it takes a certain period of time to spread out and... (This article has a total of 1 page) [Continue reading this article] Like

2. What should I do if there are always red spider mites on Oxalis?

If you want to save effort, you can snap off the leaves of Oxalis, then spray the medicine and the soil surface. (Oxalis is easier and faster to pull out leaves, other plants may not be suitable for this method) In fact, it is easy to kill red spider mites. It is often not that the medicine is ineffective, but that the insects and eggs are too small, and the medicine is not sprayed on all of them, hehe...

3. There are spider-like things on the leaves of Oxalis. Are they red spider mites?

Look at the back of the leaves and see if there are any red dots like needles. If there are, they are spider mites. Get rid of them immediately! @35$

4. What is the most effective drug for preventing and controlling red spider mites?

Prevention and control measures (I)

The prevention and control of red spiders should be based on local conditions and adhere to the principle of "prevention first, comprehensive prevention and control", with chemical prevention as the main method and physical prevention as the auxiliary method. At the same time, make full use of natural enemy resources to achieve a more ideal prevention and control effect.

1. Strengthen cultivation management measures. Apply more organic fertilizer to the plants, reduce the use of nitrogen fertilizer, enhance the tree vigor, and improve the ability of the plants to resist pest invasion. In the hot and dry season, dig holes and water in time to compensate for the water loss of the plants. Strengthen pruning, change the microclimate of plant growth, enhance the ventilation and light transmission of the plants, improve the tree vigor, and reduce the chance of pests. For plants with serious red spider mites in the year, combine garden cleaning, scrape off the peeling, remove dead leaves, fallen leaves and weeds on the branches and trunks, and other overwintering places, eliminate overwintering female adults and eggs, etc., and reduce the base number of insect sources.

2. Chemical control. According to the type of red spider and the performance of the pesticide, the key period of pesticide application should be mastered to completely eliminate the early damage and control the recurrence of rampant later. In early spring or winter, spray 3 to 5 degrees Baume lime sulfur mixture on the plants, and add 0.2% to 0.3% washing powder to enhance the spread of the pesticide. It can kill overwintering eggs or adult mites and reduce the base number of insects. In late April to early May, when the overwintering eggs are in the peak hatching period, use 5 to 10 times of 40% oxydemeton-methyl EC and 30 times of 18% hypertonic oxydemeton-methyl EC to apply or dry on the roots. During the period of red spider damage, apply aldicarb, phoxim and other granules to the roots of potted flowers and bonsai, and the amount of medicine depends on the size of the plant. After burying, water it enough to improve the efficacy. Or directly irrigate with systemic pesticides such as oxydemeton-methyl EC. But keep away from water sources to avoid pollution. During the outbreak period, spray 20% dicofol EC 500-600 times, 20% methsolipid EC 2000 times, 5% nisolan EC 1500 times, 50% long-lasting phosphorus EC 1500 times, 40% carbofuran EC 1500 times, 40% oxydemeton EC 1500 times, 10% tylosin EC 3000 times, etc., which can greatly reduce the insect population density. In order to prevent pests from developing resistance to pesticides, the pesticides should be used alternately or mixed.

3. Pay attention to protecting and using natural enemies such as ladybugs and lacewings to control the occurrence of red spider mites

Prevention and control measures (II)

(1) Soak citrus peels in 10 times the amount of water for a day and night, filter and spray on the plants to prevent aphids and spider mites.

Watering the soil can prevent nematodes in the soil.

(2) 15 g of washing powder, 15 ml of 20% caustic soda, and 7.5 kg of water. Mix the three and spray. Check after one or two days.

The mortality rate of adult and nymph red spider mites is 94%-98%.

(3) Take 50g of wood ash, add 2500g of water and stir thoroughly, soak for two days and nights, filter, then add 3g of washing powder and mix well before spraying

Spray once a day for three consecutive days, and then spray again for three days every other week to eliminate the second generation of pests and also prevent aphids,

Piercing and sucking pests such as red spiders and scale insects. Putting it into the soil can prevent and control maggots.

(4) Light a mosquito coil and place it in the pot of diseased plants. Then tie the pot tightly with a plastic bag. After about an hour of fumigation,

After that, both eggs and adults can be killed. This is a good method that is both economical and effective.

5. Please help me with methods to kill "red spider mites" (the old red spider mites on flowers from 4 to 6 months old). Thank you!

At present, the biological pesticides suitable for family use sold on the market, such as Flower Pest Control and Aiful, are highly safe, environmentally friendly, non-toxic and harmless, and can prevent and control common pests such as red spiders, aphids, and scale insects. In addition, you can prepare a plant-based pesticide yourself. Take 50 grams of tobacco leaves, add 1500 grams of water, soak for a day and night, rub repeatedly during the soaking process, remove and filter. Then add a little bit of washing powder and spray.

6. How to kill red spider mites on plants

I soak the tobacco in water for a while, then pour the soaked water into a spray bottle and spray it on the plants.