The chemicals’ absorption into the plant is achieved either by spraying the leaves or by applying solutions impregnated with the chemicals to the soil, so that intake occurs through the roots. The continued search for effective synthetic compounds led in the early 1940s to the production of DDT, a remarkable compound that is highly toxic to most…. Insecticides are claimed to be a major factor behind the increase in the 20th-century's agricultural productivity. Natural insecticides are usually short-lived on plants and cannot provide protection against prolonged invasions. You can use the backspace or click on any word to get more choices for a desired or a correct word selection, that you are looking for. They include ovicides and larvicides used against insect eggs and larvae, respectively.Insecticides are used in agriculture, medicine, industry and by consumers. Build a city of skyscrapers—one synonym at a time.
This article was most recently revised and updated by, Environmental contamination and resistance, Merck Manual - Veterinary Manual - Overview of Insecticide and Acaricide (Organic) Toxicity.
They include such chemicals as hydrogen cyanide, naphthalene, nicotine, and methyl bromide and are used mainly for killing insect pests of stored products or for fumigating nursery stock. You have not find out the answer correctly. By preventing crop losses, raising the quality of produce, and lowering the cost of farming, modern insecticides increased crop yields by as much as 50 percent in some regions of the world in the period 1945–65. The faster you identify, the higher your score. Once resistance has developed, it tends to persist in the absence of the pesticide for varying amounts of time, depending on the type of resistance and the species of pest.
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The carbamates are a group of insecticides that includes such compounds as carbamyl, methomyl, and carbofuran. They are applied as sprays or dusts onto the leaves and stems of plants eaten by the target insects. Learn more about the types, modes of penetration, uses, and environmental impacts of insecticides.
Many insecticides are short-lived or are metabolized by the animals that ingest them, but some are persistent, and when applied in large amounts they pervade the environment. Most synthetic insecticides penetrate by all three of these pathways, however, and hence are better distinguished from each other by their basic chemistry.
Send us feedback. Birds of prey such as eagles, hawks, and falcons are usually most severely affected, and serious declines in their populations have been traced to the effects of DDT and its relatives. The organophosphates usually have little residual action and are important, therefore, where residual tolerances limit the choice of insecticides. A farmer sprays insectides in a rice paddy in Japan. The nonspecific nature of broad-spectrum chemicals makes them more likely to have such unintended effects on the abundance of both harmful and beneficial insects. See more. Insecticides meaning in Hindi : Get detailed meaning of Insecticides in Hindi language.This page shows Insecticides meaning in Hindi with Insecticides definition,translation and usage.This page provides translation and definition of Insecticides in Hindi language along with grammar, synonyms and antonyms.Answer of question : what is meaning of Insecticides in Hindi dictionary?
The naturally occurring contact insecticides include nicotine, developed from tobacco; pyrethrum, obtained from flowers of Chrysanthemum cinerariaefolium and Tanacetum coccineum; rotenone, from the roots of Derris species and related plants; and oils, from petroleum. They have also been important in improving the health of both humans and domestic animals; malaria, yellow fever, and typhus, among other infectious diseases, have been greatly reduced in many areas of the world through their use.
In this approach, a minimal use of insecticide may be combined with the use of pest-resistant crop varieties; the use of crop-raising methods that inhibit pest proliferation; the release of organisms that are predators or parasites of the pest species; and the disruption of the pest’s reproduction by the release of sterilized pests. The faster you answer, the higher your score. (.
Delivered to your inbox! Insecticide, any toxic substance that is used to kill insects. When an insecticide is applied, much of it reaches the soil, and groundwater can become contaminated from direct application or runoff from treated areas. Insecticide definition is - an agent that destroys one or more species of insects; broadly : an agent that destroys insects as well as other small pests (such as mites or … 3. Contact poisons penetrate the skin of the pest and are used against those arthropods, such as aphids, that pierce the surface of a plant and suck out the juices. The main soil contaminants are the chlorinated hydrocarbons such as DDT, aldrin, dieldrin, heptachlor, and BHC. Aphids, mealybugs, and cyclamen mites are all common problems and can be controlled with any low-toxicity, Fontenot said only a few horses and no goats have died, probably because they are generally kept in stalls which can be sprayed with, Stay alert to bronzing and crinkling of the leaves and apply an, Mark your calendar for next year in early June and July to spray the plants with acephate or another systemic, Your garden center may also offer a systemic, But bed nets need to be replaced every 3 years, as the, Post the Definition of insecticide to Facebook, Share the Definition of insecticide on Twitter, 9 Pairs of Words That Look the Same But Different. “Insecticide.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/insecticide. Insecticides are substances used to kill insects. What made you want to look up insecticide? TELUGU TYPING - Online Typing Made Easy!--0: 0: 0: 1. Test Your Knowledge - and learn some interesting things along the way.
Telugu definition, a Dravidian language spoken mainly in Andhra Pradesh state, SE India. Their toxicity is thought to arise from a mechanism somewhat similar to that for the organophosphates. Some of these compounds are quite stable and have a long residual action; they are, therefore, particularly valuable where protection is required for long periods. Hundreds of species of harmful insects have acquired resistance to different synthetic organic pesticides, and strains that become resistant to one insecticide may also be resistant to a second that has a similar mode of action to the first.
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Insecticide, any toxic substance that is used to kill insects. They are generally much more toxic than the chlorinated hydrocarbons. Their toxic action is not fully understood, but they are known to disrupt the nervous system. Though these compounds were originally derived mainly from plant extracts, the toxic agents of some of them (e.g., pyrethrins) have been synthesized. Such substances are used primarily to control pests that infest cultivated plants or to eliminate disease-carrying insects in specific areas.
Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free! Can you spell these 10 commonly misspelled words? They are especially effective against sucking insects such as aphids and mites, which feed on plant juices. The contact insecticides can be divided into two main groups: naturally occurring compounds and synthetic organic ones. A number of these insecticides have been banned for their deleterious effects on the environment. You'll have 15 seconds to find out correct synonym for given word. In the latter scheme, they are classified according to whether they take effect upon ingestion (stomach poisons), inhalation (fumigants), or upon penetration of the body covering (contact poisons). The main synthetic groups are the chlorinated hydrocarbons, organic phosphates (organophosphates), and carbamates. Such substances are used primarily to control pests that infest cultivated plants or to eliminate disease-carrying insects in specific areas. Accessed 30 Sep. 2020. Are We Entering 'Uncharted' or 'Unchartered' Waters. The accumulation of some insecticides in the environment can in fact pose a serious threat to both wildlife and humans. Stomach poisons have gradually been replaced by synthetic insecticides, which are less dangerous to humans and other mammals. The chlorinated hydrocarbons were developed beginning in the 1940s after the discovery (1939) of the insecticidal properties of DDT. To Learn English from Hindi watch these YouTube Videos and Subscribe English SIkho Channel for Latest Video updates.
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