The (British) BDAA Newsheet for June 2003 recommends a cold-water nettle
brew against aphids - fresh nettles ( 1 kg to 10 litres water) are left to
stand for 12-24 hours (longer, it ferments and becomes ineffective); the
strained liquid is sprayed undiluted onto the infested plants, daily for
several days. This is said to stimulate sap flow, helping the plants to
overcome checks in growth which invited the aphids in the first place. I
wonder if the formic acid (?) of the 'sting' also has a direct effect on the
insects?
For a severe infestation, they recommend a similar brew of bracken, tansy
and wormwood.
Has anyone tried this, with what results? Any comments on the mechanism?
Tony N-S.
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