Bacterial Insecticides

Bacterial Insecticides
Bacterial Insecticides

Video: Bacterial Insecticides

Отличия серверных жестких дисков от десктопных
Video: Microbial Pesticides Part-1 2023, February
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The beginning is in the articles:

Biologicals for garden protection

  • Bacterial fungicides

Today, as modern insecticidal agents, permitted for use in personal subsidiary plots (LPH), preparations are proposed based on:

entomopathogenic bacteria Bacillus thuringiensis (Lepidocide, Bitoxibacillin),

  • soil bacteria Streptomyces avermitilis (Fitoverm, Akarin),
  • entomopathogenic fungi Metarhizium anisopliae (Metarizin).

Bacterial insecticides can be used against garden pests - Bitoxibacillin, Lepidocid, Fitoverm, Akarin. To protect against soil pests (bear, May beetles, wireworm), it is recommended to use mushroom insecticides (Metarizin).

Bitoxibacillin (Bacillus thuringiensis var.thuringiensis) and Lepidocid (Bacillus thuringiensis var.kurstaki) are preparations based on the bacterium Bacillus thuringiensis, which has an intestinal effect. The drugs Lepidocid SK-M, SK and Lepidocid SK are analogues. There is practically no addiction to them, they are short-lived, quickly decompose in the light.

They have no prophylactic effect, they should only be used when pests accumulate. But their biological effectiveness is quite high, against the Colorado potato beetle it exceeds 90% on the third day. Bacteria and their toxins enter the intestinal tract with food and cause the death of pests due to damage to internal organs.

The drugs have a number of application features. Their effectiveness depends on weather conditions: temperature, humidity (rain washes away drugs). They are effective at temperatures above 16 ° C and high nutritional activity of pests, but they do not act immediately. Figuratively speaking, pests will first eat your favorite flowers, and only then they will lose their appetite. Because of this delayed action, Bitoxibacillin and Lepidocide are inferior to chemical insecticides in terms of toxic effect. However, the feeding activity of pests decreases immediately after treatment, death begins on the 3-5th day, and on the tenth day, the maximum effect is achieved. Treatments must be carried out every 7 days.

Bitoxibacillin and Lepidocide work well against pests of vegetables, grapes, shrubs. The drugs do not accumulate in plants and fruits; they are used at any stage of plant development. The main advantage of preparations based on bacteria is the absence of toxicity for entomophages and beneficial entomofauna. They are harmless to plants, honey bees, fish and warm-blooded animals.

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AVERMICTINS, natural neurotoxins produced by the bacteria Streptomyces avermitilis, are used at very low concentrations.

They act on most arthropods, including insects and ticks, and some roundworms (rootworms). But, they do not act on annelids (in particular, earthworms). Avermectins are insoluble in water, solutions in oils with an emulsifier are used, therefore they have only contact and translaminar activity. The higher the temperature, the better and faster the drug gets into the leaf.

The drugs work well, starting from a temperature of 20 ° C, their effectiveness drops sharply at temperatures below 18 ° C, and doubles at temperatures above 28 ° C. Avermectins are especially active against insects and mites that feed on leaf tissues. Avermectins are considered one of the most effective anti-tick drugs. It works well on leaf-gnawing animals, including real sawflies. And for sucking insects (the same aphids) it is better to use other drugs. Preparations based on avermectins are extremely dangerous for beneficial insects, especially bees. Fitoverm and Akarin belong to avermectins.

Fitoverm (DV Aversiktin S) was developed in Russia (NPO Farmbiomed), it is used to protect flower crops in open and protected ground, vegetable, ornamental and fruit crops.

Akarin (DV Avertin N) is an insectoacaricide from England to protect crops in open and protected ground from insect pests.

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METARIZIN (Metarhizium anisopliae P-72) is recommended mainly as a plant protection agent against soil-dwelling pests: bears, wireworms, click beetles, beetles and larvae of the Colorado potato beetle, although there are about 200 species of insects that can be affected by this fungus. The entomopathogenic fungus Metarisium grows into the body cavity of insects, secretes toxins and enzymes that cause the death of pests.

This mushroom was discovered in soil more than 100 years ago by the outstanding Russian microbiologist I.I. Mechnikov. Metarhizium fungi were found to be harmless to humans, animals, and earthworms. There are two known formulations: on a peat substrate and on sodium humate.

Metarizin is introduced into the soil by various methods: it is mixed with fertilizers, dissolved in water for irrigation and spraying of the soil, as well as for processing planting material (roots of seedlings, bulbs, tubers). Application to the soil reduces the number of harmful insects both during the growing season and during wintering. It is especially important to add the preparation to the soil in AUTUMN during the rainy season, in order to disinfect the soil by the next season!

Photo: Rita Brilliantova

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