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Cotton red spider, tetranychus cinnabarinus, also known as cinnabar leaf mites, cotton leaf mites, red leaf mites, belongs to the family of tick mites leaf mites. If mites and adult mites gather on the back of the leaves to absorb the juice, the leaves are gray-white or yellowish spots, and the leaves dry up and fall off in severe cases, and spin silk nets on the leaves, which seriously affects the growth and development of plants. 10-20 generations per year (increasing from north to south), overwintering insect states and sites vary with regions, and female adult mites overwinter in weeds, litter and soil crevices in North China. In Central China, it overwinters in weeds and bark crevices in various insect states; In Sichuan, female adult mites overwinter on weeds, and heavy rain has an inhibitory effect.
If drugs can be used for prevention and control, avermectin and imidacloprid are often used.
It is recommended to remove the stumps and leaves before spraying with pesticides.
1. Increase air humidity;
2. Maintain good ventilation;
3. Avoid high temperatures for a long time.
Pesticides are used to eliminate the pest, and then physical methods are used to continuously control the infestation to prevent the recurrence of red spider outbreaks.
Hope that helps.
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Red spider ... It's a kind of mite, you can, a lot of methods, hope.
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Approximate how big it is, probably a spider mite.
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There shouldn't be red spiders, I've been planting them for almost 4 years, and I've never seen them.
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Fertilization Fertilization should not be excessive, generally use compound fertilizer, peak growth period, can be applied 1 to 2 times a month fertilizer, decomposed compost or nitrogen, phosphorus, potassium can be; You can also bury 3 holes of cooked soybeans evenly in the soil next to the pot, with 7 to 10 grains per hole, and be careful not to contact with the roots. Fertilization is stopped from November to March of the following year. Soil Saxifrage prefers loose sandy and humus soils, and is drought tolerant and barren.
The potted soil should be well drained, and 3 parts of fertile garden soil can be mixed with 1 part cinder, and a small amount of soybean cake or chicken manure can be added as base fertilizer. Temperature The appropriate temperature for growth is 18 to 27, and the growth stops below 13. In winter, the temperature should not fall below 10 for a long time, otherwise the base of the plant will rot and the whole plant will die.
Physiological diseases of pests and diseases: Burns caused by strong light exposure in summer; Low temperatures in winter cause frost damage. It can be prevented through environmental management. Bacterial soft rot sprayed with 1000 times of agricultural streptomycin at the beginning of the disease, or 800 times of 65% dixone.
Spray 75% chlorothalonil 600 times or 50% carbendazim 500 times solution at the onset of leaf spot disease. Spray 1 spray every 7 to 10 days, 2 to 3 times in a row. Sagittal scale (1) Natural enemy control.
Natural enemies include the short-margined hairy aphid wasp, the long-beaked hairy wasp, the **aphid wasp and the red-spotted lip ladybug. (2) Pharmaceutical prevention and control. During the incubation period of nymphs, spray 1000 times of 40% dimethoate or 50% pine borer in time.
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Cuttings (only suitable for varieties with leaves without golden yellow trim or silver veins, otherwise the yellow and white markings on the leaves will disappear and become the common variety of saxifer. The method is to select a strong and full leaf, cut into 5 6 cm long, (the cut leaf should be placed in a dry and cool place for a few days, let the incision dry, insert it directly or obliquely in the medium, insert it into the depth of 1 3 or 1 2 of the length of the cutting section, and pour it once after insertion. Insert it in sand or vermiculite (note that it cannot be inverted), expose half of the soil surface, keep a little damp, and take root in about a month.
At 15-20 degrees Celsius, roots or rhizomes will emerge from the base in about a month, and gradually grow into new plants. When the seedlings grow 2 or 3 leaves, they can be potted and planted. )
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Rubbing the spider silk will not affect the tiger piran.
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The two pots of flowers are not very good, so they have to be treated.
Watering varies depending on the season, for example, in winter, it is better to water less: once a week or so is enough. For flowering, as long as you hand over the water for 3 days, it is OK.