Disclosed are concentrated water-in-oil neem oil emulsions containing a pesticidally effective amount of azadirachtin, which concentrated emulsions, upon dilution with water, form storage stable oil-in-water emulsions.

Neem bark extracts produced by pre-treating the bark of neem with an organic solvent having a dielectric constant of 10 or lower, for example, benzene or ethyl acetate and subjecting the residue obtained by the pre-treatment to extraction with a hydrophilic organic solvent having a dielectric constant from 15 to 35, for example, methanol or ethanol and recovering the neem bark extracts from the hydrophilic organic extraction solvent.

This invention relates to insecticidal hydrogenated extracts of seeds of the neem tree (Azadirachta indica), compositions containing the extracts and methods of their use.

An alternate approach to vasectomy for long term male contraception following a single intra-vas.application of a traditional plant (Azadirachta indica) product having immunomodulatory properties is described. The intra-vas administration of neem oil to male rats resulted in a block of spermatogenesis without affecting the testosterone production; the seminiferous tubules, although reduced in diameter, appeared normal and contained mostly early spermatogenic cells. No antisperm antibody could be...

Novel fungicide compositions prepared from neem seeds are disclosed. Two distinct neem derived fungicides obtained non-polar, hydrophobic solvent neem seed extracts which are substantially free of azadirachtin, by removing the hydrophobic solvent and cooling the resulting neem oil to separate a semi-solid neem wax fraction and a clarified neem oil fraction.

Hot-water extracts of the neem bark produced by treating the bark of neem with water at a temperature from 0.degree. to 40.degree. C. and subjecting the residue from said pre-extraction treatment to extraction treatment with hot water. Purification of the extract thus produced by means of alcohol precipitation or dialysis gives products of a higher purity. Moreover, treatments prior to the pre-extraction treatment with water at 0.degree.-40.degree. C. with a non-polar organic solvent having a di...

This invention relates to a new process for refining and deodorizing the oil from the seeds of the neem tree by refining a neem oil solution with an alkaline solution of hydrogen peroxide to provide an edible grade of vegetable oil.

Disclosed is an improved method of extracting neem seeds. The method involves co-solvent extracting neem seeds with a solvent mixture of a nonpolar, aliphatic hydrocarbon solvent and a polar solvent to simultaneously remove the hydrophilic and hydrophobic extracts from the neem seeds. The method provides novel neem extract mixtures which contain both the hydrophobic and hydrophilic portion of the neem seeds. The extract mixtures may be further extracted to yield an azadirachtin-containing solid ...

A solid pesticide composition is described wherein the composition contains a seem seed extract and at least one saccharide. The solid pesticide composition is preferably storage stable, has higher pesticidal activity, and can be easily dissolved and/or dispersed in a liquid medium, such as a water-based medium.

Storage stable composition effective as a biorational agent for protection against pests, e.g. Japanese beetles, is a diluted ethanol neem seed extract comprising from about 2,000 to about 4,000 ppm azadirachtin and having a pH ranging from about 3.5 to about 6.0.