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Insecticide classification – everything from A to Z

classification of insecticides

Sadly, farmers often have to share their crops with both family members and insect pests. A detailed classification of insecticides will help the grower find the right solution to deal with unwanted guests. These drugs differ from each other in chemical composition, the way the pest enters the body and the degree of danger to humans and animals..

Pesticides are of both selective and continuous action. For example, larvicides are used to kill insect larvae and caterpillars. At the same time, ovicides destroy insect eggs and also kill ticks.

Insecticide classification: 4 mechanisms of action

insecticides for aphid control

Either one or several chemical compounds act as part of a special chemical. Upon contact with an insect, the poison causes a certain reaction in the body. As a result, paralysis occurs and the subsequent death of the pest..

Depending on the mechanism of action, means of controlling harmful insects are divided into 4 groups:

  1. Intestinal. They are applicable to all gnawing species of parasites – moths, beetles or butterfly larvae. The poisonous substance begins to act only when it enters the digestive system: mouth, stomach and intestines.
  2. Contact insecticides. The chemicals are formulated on the basis of organophosphates, peritroids or synthetic substances. The poison penetrates inside through the skin, so the product is simply sprayed over the surface of the foliage. It does not cause burns, but it kills thrips and aphids..
  3. Fumigants (respiratory). The insect inhales the vapors / gases of the insecticide, resulting in paralysis or blockage of the pest’s airways. They are used in case of severe contamination of the territory / building..
  4. Systemic insecticides. In this case, the plant absorbs the chemical and distributes it to all fibers and tissues. Thus, the culture turns into a poison for pests. However, such pesticides act gradually.

Contact drugs have one drawback. After rain, dew or fog, the poisonous mixture is washed off the plants. Therefore, processing is carried out in dry weather..

pest control

The given characteristic is relative, because often manufacturers produce drugs with complex effects. Therefore, they are often grouped according to their chemical composition. Particularly popular are insecticides of contact-intestinal action, since they destroy pests of not only one species, but several.

Systemic insecticides are divided into 3 categories, depending on the intended use. Acaricides are used to combat ticks, but nematicides and anthelmintics are used against round hearts and parasites..

The chemical composition of insecticides is a rich heritage of world science

insecticides with different chemical composition

Manufacturers can obtain the active ingredient in a variety of ways. They use copper, mercury, sulfur, barium or fluorine as inorganic compounds. Some products are produced on the basis of the waste products of fungal spores, as well as plants or other microorganisms. They include both pretrins and avermectins. However, the use of organic insecticides is a market leader..

These drugs are of 3 types:

  1. Peritroids. They have a selective effect, therefore they are safe for warm-blooded animals. They penetrate deep into the cuticle of plants and are retained in it for a long time. Due to this feature, they are used at very low temperatures. Sadly, insects quickly get used to them and even develop immunity..
  2. Organophosphate insecticides (FOS). They have a high initial toxicity (period of activity from 10 to 40 days) and have a neuroparalytic effect. The compounds are capable of rapidly degrading in soil / water into non-toxic products. The consumption of the drug is insignificant.
  3. Organochlorine. The poisonous compound affects the nervous system, blocking the passage of nerve impulses. Paralysis with subsequent death does not occur immediately, but within a week. COS dissolve well in fatty, oily mixtures, but very poorly in water.

FOS-based preparations have the endings “-thion” and “-phos”. This helps to immediately identify them among the “competitors”. However, due to the high toxicity, WHO has banned the use of some organophosphates..

phos classification

Also in the classification of insecticides there is another group – neonicotinoids. They are obtained by extracting toxic substances from tinctures of tobacco or makhorka. When they enter the pest’s body, they have a paralytic effect on the nervous system, often causing overexcitation. This leads to impaired coordination of movements and respiratory reflex, and also causes convulsions and diarrhea. The preparations are effective in the fight against gnawing, soil and sucking pests: leafhoppers, aphids, thrips, Colorado potato beetle, nutcracker, weevils and beet chips.

phosphorus compounds

Insecticide hazard class – safety first

risk classification

In addition to the listed funds, manufacturers also produce drugs from biological materials. When creating them, stamps of viruses or bacteria are used. Chemicals have a slow effect on pests, gradually inhibiting basic bodily functions. They pose no danger to plants or humans. At the same time, these funds are not suitable for massive damage to landings. Therefore, experts advise using more toxic substances..

classification of pesticides by hazard

The hazard class of insecticides is determined by their effect on the human body. This takes into account the degree of carcinogenicity and toxicity of the active ingredient, as well as the reaction of the mucous membrane to it..

Basically, 4 groups of such drugs were identified:

  1. Especially / extremely dangerous (ΙA). These include toxic chemicals with respiratory exposure. Such fumigants are used only in closed rooms (without the admission of people), therefore they are not advised to be used in the national economy. The maximum permissible concentration (MPC) is less than 0.1 mg / m³. Durability – 2 years.
  2. High danger (ΙB). They are created on the basis of a very toxic substance – fenthion. Therefore, they are prohibited from processing food or forage crops. MPC – 0.1-1 mg / m³. Durability – 6-24 months.
  3. Moderately dangerous (ΙΙ). These include pyrethrins, which are less toxic to warm-blooded animals, and organophosphate insecticides that kill cold-blooded animals. MPC – 1-10 mg / m³. Durability – 6-12 months.
  4. Low hazard (ΙΙΙ). They include avermectin, which decomposes within 5-7 days. This is very important when processing fruit and berry lands. MPC – from 10 mg / m³. Longevity up to one month.

Extremely dangerous drugs are used only in exceptional cases, and high-risk agents are used under the supervision of experienced specialists..

exposure classification

Several components of these chemicals can have mutagenic effects on human cells, tissues and organs. Others affect the fertility of men and women. Poisonous compounds cause irreparable harm to people and the environment. Epidemiological studies have shown that in areas where there is a high load of insecticides (up to 0.7 kg / ha), children are born with congenital malformations.

division by degree of cumulation

Features of the use of insecticides – the importance of prudence

application features

Most chemicals are produced in the form of liquid solutions, powders or granules. Sprays and crayons are also produced. Read the instructions carefully before starting the etching process. Manufacturers separately create preparations for the garden, indoor crops and vegetable gardens.

There are 4 methods of using pesticides:

  • spraying;
  • fumigation – steam and gaseous installations;
  • pollination;
  • bait in the form of granules, powder.

The last type of insecticide is introduced into the soil during digging or weeding. Liquid concentrates are diluted gradually. A third part is separated from the required volume of liquid. The required amount of chemical is dissolved in it, mixed, and then the missing amount of water is introduced. Processing is advised to be carried out immediately after preparation. The solution loses its effectiveness within 30-60 minutes.

safety precautions when working with insecticides

Household insecticides are used with particular caution, since they have direct contact with humans. May come in contact with skin or respiratory tract.

Properly prepared water will help enhance the effect of the insecticide. Choose a liquid with a neutral or slightly acidic reaction (5.5-7 pH). In alkaline mixtures, the pesticide loses its properties. Therefore, some gardeners add a little citric acid (5 g / 10 L) or vinegar (9%, 5 ml / 10 L). The liquid temperature should be between 10 and 16 ° C. In cold water, the solubility of the drug decreases by an order of magnitude.

preparation of working solution

This classification of insecticides will help the gardener find the remedy that will best help him cope with the horde of insect pests..

Pest control with insecticides – video

https://www.youtube.com/watch?v=nDnKiUmqI40

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