- Mar 27, 2018 -
Thiamethoxam is a systemic insecticide in the class of neonicotinoids. It has a broad spectrum of activity against many types of insects. Thiamethoxam affects bumblebees negatively according to independent European scientific studies from 2014 and 2016
Thiamethoxam was developed by Syngenta a patent dispute arose with Bayer which already had patents covering other neonicotinoids including imidacloprid. In 2002 the dispute was settled, with Syngenta paying Bayer $120 million in exchange for worldwide rights to thiamethoxam
3,Mechanisms of action
Thiamethoxam is a broad-spectrum, systemic insecticide, which means it is absorbed quickly by plants and transported to all of its parts, including pollen, where it acts to deter insect feeding. An insect can absorb it in its stomach after feeding, or through direct contact, including through its tracheal system. The compound gets in the way of information transfer between nerve cells by interfering with nicotinic acetylcholine receptors in the central nervous system, and eventually paralyzes the muscles of the insects.
Syngenta asserts that thiamethoxam improves plant vigor by triggering physiological reactions within the plant, which induce the expression of specific "functional proteins" involved in various stress defense mechanisms of the plant allowing it to better cope under tough growing conditions, such as "drought and heat stress leading to protein degradation, low pH, high soil salinity, free radicals from UV radiation, toxic levels of aluminum, wounding from pests, wind, hail, etc, virus attack
4,Uses and recommendations
For control of aphids, whiteflies, thrips, ricehoppers, ricebugs, mealybugs, white grubs, Colorado potato beetle, flea beetles, wireworms, ground beetles, leaf miners and some lepidopterous species. Major crops for foliar and soil treatments are cole crops, leafy and fruity vegetables, potatoes, rice, cotton, deciduous fruit, coffee, citrus, tobacco and soya beans; for seed treatment use, maize, sorghum, cereals, sugar beet, oilseed rape, cotton, peas, beans, sunflowers, rice and potatoes. Also for control of flies (such as Musca domestica, Fannia canicularis and Drosophila spp.) in animal and public health.
Thiamethoxam can effectively prevent and cure various aphid, leafhopper, planthopper, whitefly, beetle larvae and potato beetles, worms, ground beetle, leafminer, insect pests. It can be used in stem and leaf treatment, seed treatment and soil treatment. suitable crops are: rice crops, sugar beet, rape, potato, cotton, beans, fruit, peanut, sunflower, soybean, tobacco and citrus.
FS = Flowable concentrate for seed treatment
GR = Granule
SC = Suspension concentrate (=flowable concentrate)
WG = Water dispersible granules
WP = Wettable powder
WS = Water dispers
Oral:Acute oral LD50 for rats 1563 mg/kg. Percutaneous:Acute percutaneous LD50 for rats >2000 mg/kg. Non-irritating to skin and eyes (rabbits); not a skin sensitiser (guinea pigs). Inhalation: LC50 (4 h) for rats >3720 mg/m3. ADI:( JECFA) 0.1 mg/kg b.w.
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