Download e-book for iPad: A Field Guide to Trees and Shrubs: Northeastern and by George A. Petrides

By George A. Petrides

ISBN-10: 039535370X

ISBN-13: 9780395353707

Детально охарактеризованы все дикорастущие деревья, кустарники и древесные лианы, обитающие к югу от Ньюфаундленда, к северу от Северной Каролины и Тенесси, к востоку от Дакоты и Канзаса. Охарактеризованы 646 вида, включая форму и расположение листьев, высоту, цвет, строение кроны, сезон цветения и плоды. Четкие рисунки показывают листья, цветы, силуэты деревьев и прочие характеристики.
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Детально охарактеризованы все дикорастущие деревья, кустарники и древесные лианы, обитающие к югу от Ньюфаундленда, к северу от Северной Каролины и Тенесси, к востоку от Дакоты и Канзаса. Охарактеризованы 646 вида, включая форму и расположение листьев, высоту, цвет, строение кроны, сезон цветения и плоды.

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Additional info for A Field Guide to Trees and Shrubs: Northeastern and North-Central United States and Southeastern and South-Central Canada

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Please use the print version of this publication as the authoritative version for attribution. WHAT'S IN A NEEM 33 organ similar to the human pituitary, which controls the secretion of hormones. " It blocks the insect's production and release of these vital hormones. Insects then will not molt. This of course breaks their life cycle. On average, neem kernels contain between 2 and 4 mg of azadirachtin per gram of kernel. The highest figure so far reported—9 mg per g—was measured in samples from Senegal.

Meliantriol Another feeding inhibitor, meliantriol, is able, in extremely low concentrations, to cause insects to cease eating. The demonstration of its ability to prevent locusts chewing on crops was the first scientific proof for neem's traditional use for insect control on India's crops. Salannin Yet a third triterpenoid isolated from neem is salannin. Studies indicate that this compound also powerfully inhibits feeding, but does not influence insect molts. The migratory locust, California red scale, striped cucumber beetle, houseflies, and the Japanese beetle have been strongly deterred in both laboratory and field tests.

Contraception is a topic of such sensitivity—personal, political, scientific, and religious—that here, too, its future role is uncertain. Its use as a spermatocide—the male contraceptive mentioned earlier—is so uncertain that it will likely take decades of research to develop even if no safety hazards are found along the way. Synthetic Competition The number and complexity of the compounds in neem extracts will always preclude the economic synthesis of the full mixture. On the other hand, individual compounds may prove suitable for synthesis.

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A Field Guide to Trees and Shrubs: Northeastern and North-Central United States and Southeastern and South-Central Canada by George A. Petrides


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