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Insecticidal soap is used to control many plant insect pests. Soap has been used for more than 200 years as an insect control. [1] Because insecticidal soap works on direct contact with pests via the disruption of cell membranes when the insect is penetrated with fatty acids, the insect's cells leak their contents causing the insect to dehydrate and die. [2]
Its insecticidal activity has relatively low mammalian toxicity and an unusually fast biodegradation. Their development coincided with the identification of problems with DDT use. Their work consisted firstly of identifying the most active components of pyrethrum , extracted from East African chrysanthemum flowers and long known to have ...
Gastrodia sesamoides is a leafless, terrestrial saprophyte with an underground rhizome up to 80 mm (3 in) long and 30 mm (1 in) in diameter. The thin, fleshy brown flowering stem is 12–75 cm (5–30 in) tall with between three and six bracts 4–10 mm (0.2–0.4 in) long and between three and twenty five flowers.
Pyrethrin naturally occurs in chrysanthemum flowers and is often considered an organic insecticide when it is not combined with piperonyl butoxide or other synthetic adjuvants. [1] Their insecticidal and insect-repellent properties have been known and used for thousands of years.
An insecticidal soap solution can be an effective household remedy to control aphids, but it only kills aphids on contact and has no residual effect. Soap spray may damage plants, especially at higher concentrations or at temperatures above 32 °C (90 °F); some plant species are sensitive to soap sprays. [113] [129] [130]
The Orchid Review was founded by Robert Allen Rolfe who single-handedly produced and edited 28 volumes. [2] The first monthly issue appeared on 1 January 1893. Rolfe worked in the orchid herbarium at Royal Botanic Gardens, Kew [3] but there was no mention in the periodical of his position there and his name never appeared on the title page.
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Dipodium stenocheilum O.Schwarz - tropical hyacinth-orchid, from the northern parts of Western Australia, the Northern Territory, and Queensland. Dipodium variegatum M.A.Clem. & D.L.Jones - blotched hyacinth-orchid or slender hyacinth-orchid, from Queensland, New South Wales, and Victoria; Dipodium wenzelii P.O'Byrne - from Borneo