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Propoxur is highly toxic to honey bees. The LD50 for bees is greater than one ug/honey bee. [citation needed] Highly toxic Acephate [25] Orthene Organophosphate: 3 days Acephate is a broad-spectrum insecticide and is highly toxic to bees and other beneficial insects. [26] Moderately toxic Azinphos-methyl [27] Guthion, Methyl-Guthion ...
Coumaphos is a nonvolatile, fat-soluble phosphorothioate with ectoparasiticide properties: it kills insects and mites.It is well known by a variety of brand names as a dip or wash, used on farm and domestic animals to control ticks, mites, flies and fleas.
Fipronil is a broad-spectrum insecticide that belongs to the phenylpyrazole insecticide class. [3] Fipronil disrupts the insect central nervous system by blocking the ligand-gated ion channel of the GABA A receptor (IRAC group 2B) and glutamate-gated chloride (GluCl) channels. This causes hyperexcitation of contaminated insects' nerves and muscles.
Pyrethrins have been used as an insecticide for thousands of years. It is believed that the Chinese crushed chrysanthemum plants and used the powder as an insecticide as early as 1000 BC. It was widely known that the Zhou dynasty in China widely used pyrethrin for its insecticide properties. [10]
Acute exposure to chlorpyrifos can be toxic to bees, with an oral LD50 of 360 ng/bee and a contact LD50 of 70 ng/bee. [32] Guidelines for Washington state recommend that chlorpyrifos products should not be applied to flowering plants such as fruit trees within 4–6 days of blossoming to prevent bees from directly contacting the residue. [97]
[65] [66] [67] Many causes are proposed to contribute to this decline, the most agreed upon are loss of habitat, intensification of farming practices, and insecticide usage. Domestic bees were declining some years ago [68] but population and number of colonies have now risen both in the USA [69] and worldwide. [70] Wild species of bees are ...
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