I just found this recipe at maximumyeild.com

SPIDER MITES

â?¢ 28 grams table salt

â?¢ 4.5 liters of water

Shake well and spray liberally over plant surface and underside of leaves, or

â?¢ Steep 2 cloves of crushed garlic in 1 litre of water for 24 hours

Strain. Do not dilute. Spray on plants no more than twice a week (also works on aphids and scale mites.)

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