by Evelyn Parker
Members who listen to Gardeners Question Time will have picked up on the query recently raised about hormone weedkiller residue in farmyard manure affecting some particular plants.
The culprit is thought to be aminopyralid, a hormone-type herbicide which is used on pastures to control weeds. Manure from animals fed on treated pastures contains chemical residues sufficient to damage susceptible crops. Gardeners buying this manure to apply to vegetable crops are coming across abnormal growth, particularly on tomatoes, potatoes and legumes. Symptoms of damage are distorted foliage, cupping of leaves and fern-like foliage. There are no known remedies once damage has occurred, and there is no assurance that affected produce will be safe to eat.
The RHS Horticultural Advisory Service commented that this kind of problem was fairly unusual, and mostly attributed to accidents and carelessness, but instances have risen this year and farmyard manure has been frequently implicated. They recommend that gardeners should seek assurances from their suppliers of manure. Pippa Greenwood, who is a plant pathologist, warned that ground affected by the contaminated manure should not be used for up to two years.
We ourselves came across a similar problem in 1999, and the substance implicated was not FYM but Progrow, the soil improver produced by Hampshire County Council using composted material collected from household collections and stuff taken to the tip. I should add that we have used this product many times and this was the only occasion when we had problems with it.
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