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Summary of Study of Natural Pesticides :-

Natural pesticides are present chemicals extracted from plants. Natural pesticide products are available as an alternate to synthetic chemical formulations but they're not necessarily less toxic to humans. Some deadly, fast-acting toxins and potent carcinogens occur naturally.

Herbicides :-
Inhibition of plant growth and production of phytotoxic symptoms by certain plants and their residues may be a well established phenomenon. In looking for potential herbicides from plants, screening of compounds known to function in plant-plant interactions could be a logical strategy. All plants produce secondary compounds that are phytotoxic to some extent. However, in exactly a comparatively few cases has it been established that individual compounds provide the manufacturing species a competitive advantage over other species that are less tolerant to the compound. Only some of those allelo chemicals are actively pursued as herbicides and, in these cases, the natural compound has been modified. A derivative of the terpenoids allelochemical 1,8-cineole, with the common name of cinmethylin (Fig. 1), is being commercially developed. Toxaphenereg., a mix of chlorinated camphene derivatives, was sold as a herbicide and an insecticide, but was faraway from the market in 1982 by the EPA. Other very weakly phytotoxic compounds from plants like benzoic acids may be made far more herbicidally active by halogen substitutions. Several carboxylic acid derivatives like dicamba (3,6-dichloro-2-methoxybenzoic acid) are widely used as herbicides.

Insecticides :-
Throughout history, plant products are successfully exploited as insecticides, insect repellents, and bug antifeedants. Probably the foremost successful use of a plant material as an insecticide is that of the pyrethroids. The insecticidal properties of the several Chrysanthemum species were known for hundreds of years in Asia. Even today, powders of the dried flowers of those plants are sold as insecticides. After elucidation of the chemical structures of the six terpenoid esters (pyrethrins) accountable for the insecticidal activity of those plants, many artificial analogs are patented and marketed. Synthetic pyrethroids have better photostability and are generally more active than their natural counterparts.

Fungicides :-
Without an system to combat pathogenic microorganisms, plants rely totally on chemical protection with secondary compounds. Compounds that inhibit the establishment of and growth of plant pathogens are termed phytoalexins. Many of those secondary compounds are chemically characterized and proof is developing that these compounds have such a task in disease prevention and control. In fact, there's some evidence that certain synthetic fungicides utilized in plant protection act by inducing the assembly of phytoalexins in plants.