शनिवार, ५ डिसेंबर, २०२०

 In #organic #farming #synthetic #pesticides are generally #prohibited.

A #chemical is said to be #synthetic if it does not #already #exist in the #natural #world. But the organic label goes further and usually prohibit compounds that exist in nature if they are produced by chemical synthesis. So the prohibition is also about the method of production and not only the nature of the compound.
A #non-#exhaustive list of organic approved pesticides with their median lethal doses:-
1. #Boric #acid is used as an insecticide (LD50: 2660 mg/kg).
Bromomethane is a gas that is still used in the nurseries of strawberry organic farming.
2. #Copper(II) sulfate is used as a fungicide and is also used in conventional agriculture (LD50 300 mg/kg). Conventional agriculture has the option to use the less toxic Mancozeb (LD50 4,500 to 11,200 mg/kg)
3. #Lime #sulfur (aka #calcium #polysulfide) and sulfur are considered to be allowed, synthetic materials. (LD50: 820 mg/kg) #Neem #oil is used as an insect repellant in India; since it contains azadirachtin its use is restricted in the UK and Europe.
4. #Pyrethrin comes from #chemicals #extracted from #flowers of the genus Pyrethrum (LD50 of 370 mg/kg). Its potent toxicity is used to control insects.
5. #Rotenone is a powerful insecticide that was used to control insects (LD50: 132 mg/kg). Despite the high toxicity of Rotenone to aquatic life and some links to Parkinson disease the compound is still allowed in organic farming as it is a naturally occurring compound.



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