Why do some cacti give birth to red spiders?

1: Scale insects.

Some flower friends have doubts about the fact that cacti will give birth to scale insects, thinking that there are no conditions for scale insects at this temperature in winter, but the majority of flower friends, there is heating in the north in winter! When the room is hot and stuffy, and the ventilation is poor, the eggs hidden in the soil are very likely to revitalize, remultiply and rampant your cactus.

If you see small white worms dotted on the cactus in winter, and the cactus growth has begun to weaken or even turn yellow, don't hesitate to spray those small insects with 75% alcohol when it is light, and just change the pot to kill insects when it is heavy.

2: Spider mites.

Red spiders mostly grow in the young parts of cacti, and cacti with red spiders often have stems falling off, or the balls of cacti are yellow-brown, and there is a sick feeling in them. If there is a red spider in your cactus, you should immediately spray the red spider with avermectin.

3: Anthrax.

Cacti can also have anthrax, especially in the heated room in winter, the temperature is high and some families have a humidifier all year round, if the humidifier is close to the cactus, coupled with poor indoor ventilation, the cactus has a wound at this time, it is easy to contract anthracnose.

Anthrax is more common on the edges of cacti, light brown or whitish-gray, and the spots will be smaller at first, but gradually expand over time. **One of the major methods of cactus anthrax is to gently cut off the spotted part, immediately sterilize the wound, and put it in a relatively dry place.

4: Aphids. Aphids are similar to scale insects, all because the planting material is not clean, so there will be eggs meet the right temperature, slowly revival of the situation, aphids will suck the cactus are small holes, encountered such a situation, if the situation is not very serious, it is also recommended that everyone try to quickly change the pot to kill insects.

5: Stem rot.

Yes, cacti, which prefer to grow in slightly dry soil, can also develop stem rot, which is reflected in cacti as water-stained yellow-green patches, which gradually soften rot, leaving a dry skin in the later stage. Under normal circumstances, there is no way to save a slightly more serious stem rot, we can only focus on prevention, that is, let the air not be so humid and stuffy, and the chance of cactus stem rot will be smaller.

In fact, the probability of cactus disease and insect pests is very small, as long as we do regular ventilation every day, the indoor humidity is not so high, and the temperature is high, the most taboo is to maintain the cactus in winter, in order to keep warm reluctant to ventilate, in order to humidify desperately with a humidifier, close the humid and stuffy environment, the growth of cactus, but it is very unfavorable, you should keep in mind!

Morphological characteristics: female mites are red, oval, and have a body length of millimeters.

Distribution and hazards of Cactus Brachybeard Mites: Cactus Brachybeard Mites, also known as Cactus red spiders, are known to be distributed in China, Japan, Europe, and the Americas. Overseas, it is a well-known pest of cacti.

It is characterized by the red, oval shape of the female mite, and the body length is millimeters. Male mites are slightly pointed at the end.

Prevention and control methods: 1. The cultivation environment should be maintained at a certain temperature, which is not conducive to the reproduction of red spiders. Plants that cause from the outside should be carefully inspected to avoid envy and bring red spiders into the cultivation site.

2. In the early stage of occurrence, you can choose to spray the 40% dimethoate EC 1000 times liquid, 40% dicofol EC 1000 times liquid, etc.

Spider mites are the most vexing pest in cacti and succulent cultivation. Due to the extremely small size of the spider mites, they are good shelters in various crevices in greenhouses, in the hairs of palms, and between wart grooves, and it is difficult for drugs to be sprayed into these places. Therefore, once the spider mites spread, it is extremely difficult to completely eradicate them.

In addition, the reproduction rate of red spider spider is extremely fast, when the temperature is 29 32, it only takes 5 8 days to reproduce for 1 generation; At 22 26 hours, it only takes 11 to 15 days to reproduce 1 generation. Only when the relative humidity reaches 80% can the rate of reproduction be slightly suppressed. However, this high humidity hinders the growth of cacti and succulents.

In the high temperature and dry environment suitable for the growth of cacti and succulents, it provides favorable conditions for the reproduction and spread of red spiders.

The prevention and control of spider mites must adopt a prevention-oriented approach, and the cultivation site should be properly ventilated, but a certain humidity should be maintained to avoid stuffiness and dryness. Foreign materials must be carefully inspected to avoid bringing red spider mites into the cultivation site. Do not place potted plants too closely.

The drug control is to use 40% dimethoate 1000 1500 times solution and 40% dicofol 1000 times solution, and spray it once every 7 10 days in the high temperature and dry season. Spray thoroughly before wintering.

If the cobwebs are obvious, it's been a long time since you've managed it, and the cactus is watered less, but you can spray it with a watering can to keep it growing properly and the surface clean.

If it is a small spider web that is not easy to find, it is a red spider on the cactus, and if the red spider needs to be dealt with quickly, because the red spider will hinder the growth of the cactus until it dies. ** When you need to spray some insecticidal drugs to deal with it, moreover, red spiders are very stubborn and need to be sprayed at intervals. And after the first time, it is necessary to ventilate frequently to avoid high temperature and unventilated environment.