Neem- insecticides:



The neem tree is local to tropical South-East Asia where it is known as a vital medicinal plant. As it grows quickly and is very drought resistant, it has been refined for a long time in the arid zones of Asia, Africa and Central America as a source of wood. In India and Sri Lanka, its seeds and leaves are used for accumulate pest control and oil is extracted from the seeds for the production of soap. Both the cold pressed neem oil and the oil-free part of the seed kernel can be used for pest control. The leaves of the neem tree also contain insecticidal and nauseating substances although in much lower concentrations. Numerous insect species are repelled by dynamic ingredients in the neem seed. As they find the flavor and smell unpleasant they avoid the plants that have been treated with neem extracts. Other insects expire some time after having eaten leaves or other parts of the plant treated with these substances. They alter the behavior in some insects or reduce their ability to lay eggs. Other pest species are exaggerated minimally or not at all by the neem substances, most likely as a result of their hidden biology.
Application of the neem insecticides:
The neem extract can be applied in two ways they are while using a sprayer, the rough elements must first be filtered out of the mixture to stop clogging the nozzle. This is done by casing a bucket or similar container with a coarse cloth or gauze through which the mixture is poured. The sprayer is packed with the filtered solution and spraying of the vegetable crops can begin. If no aerosol is obtainable the extract may be applied with a straw argument. In this case, it need not be filtered. A brush made with fine, flexible straw is simply dipped into the solution and shaken over the plants until all the leaves are moistened. The effect of the neem substance lasts between 3 to 6 days, regardless of how it was applied.
How much to apply:
While spraying it is essential very much and depends on the case. This can only be determined by the farmers or the appointed adviser. In universal, it may be said that in areas of vegetable cultivation where pests are a great difficulty, weekly spraying is necessary. If, on the other hand, infection is only slight, treatments in gaps of 10 to 14 days are sufficient. Often a single treatment of the plants is enough. Just as with chemical insecticides, the pest species and crop are vital factors in deciding how often spraying should occur. According to scientific research the remove is not poisonous for humans, thus, it is not essential to wait long between final spraying and harvesting.

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