Plant biological pesticides plant essential oils

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Plant oil refers to the steam distillation component of plant tissues, which often has characteristic odor of plants, usually contains terpenes and biophenols of molecular weight. Most essential oils are complex mixtures composed of tens to hundreds of compounds. Essential oils are easily dispersed at room temperature, and they are scattered on a piece of paper for a short time without leaving traces. They have a strong special fragrance and are oily liquids. They have a high refractive index and are mostly optically active. Soluble in concentrated ethanol and a variety of organic solvents, but almost insoluble in water. The chemical composition of essential oils includes nitrogen-containing sulfur compounds such as methyl ortho methyl carbamate in neroli oil, dimethyl sulfide in ginger oil, aromatic compounds such as dill aldehyde, vanillin, cinnamaldehyde, and violet Sualdehyde, eugenol, etc.; Aliphatic linear compounds: such as leaf aldehydes, aromatic ketones, myristic acid; terpenoids: mainly sesquiterpenoids, such as laurinaldehyde, citral, caryophyllene and so on. Essential oils have the effects of attracting, killing eggs, fumigating, repelling and affecting the growth and development of insects. Certain essential oils are neurotoxic to insects, such as certain essential oils that inhibit insect acetylcholinesterase, and some are octopamine antagonists.

Mixed with organic pesticides, the main role of their mixture is: synergies, solvent effects and cover up the role of organic odor of pesticides. For example, safrole is the starting material for synergistic ethers; the effect of parathion, parathion, on houseflies is increased by a factor of 10; the cypermethrin, an essential oil of lemon, lime, and broad-leaf oranges, has a good effect. effect. Plant essential oils are non-toxic to humans and animals, non-polluting and resistant to drug resistance. They are harmless to plants or their products, have fragrant smell, and have a bactericidal effect. The application of essential oils can play a dual role in insect control and mildew resistance. It is exactly what people demand. Pollution-free pesticides, in particular for the prevention and control of pests and hygiene pests. If the essential oil is mixed with pesticides or used as a synergist and perfuming agent for pesticides, it is entirely feasible from an economical point of view. The active ingredients of some essential oils have been clarified, and they are easy to synthesize. Individually, there are already well-established synthetic routes that can meet the needs of modern mass production.

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