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Scales and false scutes are most often introduced with new plants and soil. The scale insect is a nasty, sometimes very dangerous pest - males can fly, spreading to other plants, but fortunately they have a short life cycle. Females are wingless, usually more of them, but they live longer.
The scale insect kills plants slowly but surely. The worst thing to deal with it is on small-leaved plants. Hot water helps, but badly - the shields protect. In addition, young scale insects, still in the larval stage, are very mobile, instantly spread throughout the plant, they are called "vagrants". They are so small and transparent that they are invisible until the plant begins to turn yellow or adults grow.
There is an opinion that when the scale insects are threatened by something (chemicals, unfavorable weather conditions, etc.), then more males appear, under normal conditions more females are formed. This only suggests that if you undertook to remove the scabbard, remove it immediately and cruelly, until the plants are completely healed.
Scabbard on indoor plants - how to deal
Scabbard on indoor plants - more about the pest and control measures.
Lynx: I got rid of washing the leaves with a solution of laundry soap + spraying and watering with Aktara. Scabbards are unlikely to start in the ground, tk. these insects are piercing-sucking reptiles, for reassurance when processing a plant, it is better to cover a pot of soil with a bag, and later replace 2-3 cm of the topsoil with a new substrate.
Alex: In recent times (15-20 years ago), when there were no modern drugs for pest control, a soap-oil emulsion was used to get rid of scabbards: 1 tablespoon of machine oil and 2 tablespoons of powder are diluted in 1 liter of water, shaken to obtain a homogeneous mass, it is applied to the plant with a sponge, carefully rubbing all branches and leaves on both sides. We leave it for half an hour (during this time the scabbards swell and suffocate) and wash off under a strong stream of water. Carry out 3-4 treatments at weekly intervals. I warn you, at that time, washing powders were not so toxic and without bleaching properties! It is better to use fitoverm for destruction at home - the hazard class is low for humans and animals.
Goldie: If not lazy, then wash it off by hand - with a cotton swab. The shield gags easily. And if you cannot, then wash the flower - if there is not much of it. And if there is a lot, then you will have to cut off the heavily affected parts, so it's easier to observe and treat. And the plant will grow later. To fight the scabbard seriously (if the defeat is strong), chemical preparations are needed, alternative methods for scabbard do not help. I used actellic, sprayed on the balcony.
Odina: I have citrus with scabbard for two years, until I found out about Aktara. At home a cat and a dog. And it was because of them and the children that I did not use insecticides, but I poured the actara 4 times with a week's break and the scabbard. Then, about a month later, I noticed one adult specimen (apparently one tramp survived somewhere) once shed and that's it - I haven't seen these reptiles for 8 months.
Severina: The "Doctor" remedy, the active ingredient is the same as that of the Actara, only in tablets. Suitable against scale insects. The fundamental difference with the usual actara is that if you breed it and spray the plant, the poisonous effect on pests occurs immediately, and the Doctor's tablets must be introduced into the soil, wait until the actara dissolves there and is absorbed by the plant roots. Only then will the plant become poisonous to the pest. Additionally, you can wipe the leaves and trunk of the monstera to remove the emerging individuals until the moment this drug works.