Stig, if you use a pyrethrum (I spelled it wrong in the first place) based product consider using one with piperonyl butoxide in it. It isnt organic but it acts as a synergist to the pyrethrum and extends its half life. I believe horticultural mineral oil is also somewhat effective, not...
red spider mites are mites, no insects. Need a miticide rather than an insecticide although some products do both. We used to have Kelthane but I think only Sulphur is still registered here for use on spider mites. I believe pyrthrum extracts are effective but total coverage is important as it...
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