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New PDF release: A 75 Angle Constraint for Plane Minimal T1 Trees

By Cole T.

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This differs from, but is not unlike, that of the sterols to which the insect molting hormones ("ecdysones") belong. An insect ingesting traces of these compounds is deeply affected because these "hormone mimics" block the parts of the brain that produce the hormones necessary to growth and development. In many cases, for instance, the insect's body may be ready to change while the hormones to complete the molt are not available. These deep-seated hormonal effects are the reason for neem's subtle, powerful, and yet insect-specific influences.

Indeed, it seems likely that armyworms, fruit borers, corn borers, and related pests will become the main targets of neem products in the near future. Neem blocks them from feeding, although this effect is usually less important than the disruption of growth it causes. Diptera Many species of dipterous insects—fruit fly, face fly, botfly, horn fly, and housefly, for example—are targets for neem products. Mosquitoes, too, are a possibility. Hymenoptera The freely feeding and caterpillar-like larvae of sawflies are target insects as well.

Moreover, they can be added to baits that attract insects (a process used, for instance, with cockroaches). They are even burned. For example, neem leaves and seeds and dry neem cake are ingredients in some mosquito coils. SYSTEMIC EFFECT The fact that the extracts can be taken up by plants (and thereby confer protection from within) is one of neem's most interesting and potentially useful features. As has been noted, however, the level of this systemic activity differs from plant to plant and formulation to formulation.

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