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Shield and false shield are insects that are dangerous to any plant. They can provoke illness, and sometimes the death of a green pet.
The appearance of yellow-brown plaques indicates infection with these insects. Orchids are on the list of favorite pest treats.
The article describes how to deal with the scale insect on an orchid, and also discusses preventive measures and useful recommendations.
Definition: what is this parasite?
The scale insect (family Diaspididae) and the false scale insect (family Coccidae) are representatives of the order of homoptera of the suborder Coccidae. Insects feed on plant sap (domestic, garden and forest) of:
Depending on the species, the body is round and elongated. The color ranges from light to dark brown. Sometimes a purple tint is found. The body of the scale insect is covered with a wax shell, which is a protection for the future generation.
False shields differ in that they do not have a shell, and the larvae and eggs are protected by the dying skin of the female. The size of the scale of adult insects does not exceed 5 mm, and the size of the false scale is 7 mm.
Insect larvae are called vagrants. When they leave the eggs, they spread throughout the plant. Juveniles are oval, light yellow in color and very mobile. They have eyes, three pairs of legs, and antennae.
Strollers attach themselves to leaves and stems. The limbs gradually die off. Insects are covered with a dense wax shell. The color of the carapace changes from white to brown. The larvae molt twice and turn into adult females and males.
Males become mobile. They grow legs and wings, but the oral apparatus is atrophied. After fertilization, they die. Depending on the type, females lay eggs under the scutellum or give birth to larvae (up to 1000 pieces). Then they die.
Entomologists studied about 2,400 species of scale insects and 1200 false scale insects. Differ from each other:
Varieties: description and photo
Scabbards most of all like orchids with elastic smooth leaves, since it is easier to gain a foothold on them. The types of scale insects most common on orchids are:
|Name||Features of females||Features of males|
|Cactus||Pale yellow in color.||Orange color.|
|Oleander||Rounded ovate scutellum, yellowish.||Elongated shape of the shield, covered with red spots.|
|Hemispherical false shield|
|Soft false shield|
Hemispherical false shield:
Soft false shield:
What parts of the plant can it hit?
The parasite loves specimens with hard, smooth leaves, since it is easier to attach to them... First, the scabbard attaches to the back of the leaf, pierces the leaf, and begins to suck out the juice. Later, the pest moves over the stems and into the inflorescence zone, the root area of the plants.
What is the danger of the insect?
- Sticky insect excrement leads to the development of a sooty fungus.
- Sweet honeydew disrupts the processes of photosynthesis, stops flowering.
- The false shield not only sticks to the plant, but also injects poison into the orchid, under the influence of which the leaves gradually die off.
- The death of a flower in the absence of pest control.
How to determine its appearance?
To see a pest at the beginning of its development is a difficult task. (due to its small size - 0.3 mm long).
- The first symptoms of scale insect infestation are sticky orchid leaves. This is a sticky pad that clogs the pores and prevents the plant from breathing. The insect secretes it in the process of life.
- Then small yellow-brown tubercles appear, which are located on leaf plates, young shoots and orchid flowers. Gradually, the number of such yellow spots increases.
Timely measures taken to destroy the pest will help save the orchid.
How to deal with insects and cure a flower?
First, it is necessary to carry out mechanical processing. Orchid processing stages:
- Thoroughly wash the window and sill with disinfectants.
- To catch active insects, use sticky tapes, which are placed near the flower.
- Leaves and shoots with an infestation rate of more than 50% - cut off.
- Replace topsoil.
- Rinse the leaves and peduncles with warm water using a soft soapy brush (to remove the sticky honeydew).
- Dry the plant for 1-1.5 days.
- Carry out processing using means: folk, biological or chemical (depending on the degree of infection).
The treatment is repeated after 7-10 days.
At the initial stage of infection, folk remedies are used:
|Garlic||Finely chop and apply to the insect attachment point, or rub it with half a wedge.|
|Garlic and soap|
|Bow||Rub the pest or pour water over the finely chopped onion and then pay for the plant.|
|Alcohol||They are processed pointwise. But be careful, as it can burn the leaf.|
|Vegetable oil||Two tablespoons per liter of water.|
If folk remedies did not help, treatment with biological or chemical agents can be carried out.
|A drug||Action, application|
|Promanal||Causes death of eggs and larvae. It is necessary to spray so that the whole plant is covered with the preparation so that it “drips from the plant”. Work the land thoroughly.|
|Fitoverm||Provokes paralysis of pests, and they stop feeding. Death occurs on the third day after treatment. Full effect - after 6-7 days.|
|Nemabakt||The nematode contained in the preparation is embedded in the larva and destroys it.|
|Avertin||It leads to paralysis by acting on the nerve endings of parasites.|
|Insect||Appropriate use of drugs|
|Shield||Intestinal and systemic action.|
|False shield||Intestinal, systemic and contact action.|
The lack of a durable shell in false shields does not prevent the penetration of contact poison.
|Name||A drug||Operating principle|
|Intestinal||They begin to act only after the pest enters the body.|
|Systemic||The active substance enters the plant sap through the roots and leaves. Makes it poisonous to parasites.|
|Contact||Penetrates into the body of pests through the skin.|
It is necessary to use biological and chemical agents strictly according to the instructions. After any treatment, the flowers should not be placed in direct sunlight, so as not to provoke the appearance of burns on the plant.
When using oil-based preparations, the solution is applied pointwise - only on the insect. If the agent is sprayed, then clogging of the pores on the leaves, oxygen starvation and, as a result, the death of the plant is possible.
Next, you can watch a useful video on how to deal with a scabbard on an orchid:
What won't get rid of?
- To combat scale insects and false insects, they do not use preparations containing regulators and growth stimulants, nitrogen. The use of funds will lead to the opposite effect - a strong reproduction of pests.
- If you remove insects with your hands, then you will only remove the shell, and the eggs and larvae will remain on the plant. As a result, the young growth will spread through the flower even faster.
Prevention of re-infection
Preventive actions for the reappearance of pests are as follows:
- cure the orchid from other diseases (if any);
- create favorable conditions for growth and flowering (the required level of lighting and humidity);
- if infected specimens are identified, immediately quarantine them and begin pest control;
- Keep "beginners" in pots separately from other flowers (2 - 4 weeks).
If an orchid has become infected with a scabbard or false shield, urgent measures must be taken. Otherwise, the flower may die, and not only shed the buds or leaves. Control methods depend on the personal preference of the owner and the degree of infection.