scotty Posted July 12, 2010 Share Posted July 12, 2010 Has anyone seen a white powdery/crystal substance on the stems of mint and also on the stems of cassis plant both in clay soil outside. 15 metres between plants. Link to comment Share on other sites More sharing options...
Patf Posted July 13, 2010 Share Posted July 13, 2010 Had you been watering them? Could be some deposit from the irrigation water, as it dries out on the plant. Link to comment Share on other sites More sharing options...
scotty Posted July 13, 2010 Author Share Posted July 13, 2010 Yes. I'll try an experiment on a bit that is free of it.ThanksScotty Link to comment Share on other sites More sharing options...
scotty Posted July 23, 2010 Author Share Posted July 23, 2010 I have since noticed that this substance has appeared on trees around the perimeter of my plot. It does not discriminate, it seems to be everywhere. It must be some sort of infection caused by who knows what. Link to comment Share on other sites More sharing options...
Grumpy Posted July 24, 2010 Share Posted July 24, 2010 Hi Scotty. Are you sure this is a crystal? The randon spread of the attack would suggest wolly aphid which sap feeds on distressed plants and appears like a mat of small white crystals. Try picking some off and see if they are hard or squishy. If it is wolly aphid it can be treated with propriatory insecticides.Grumpy Link to comment Share on other sites More sharing options...
Grumpy Posted July 26, 2010 Share Posted July 26, 2010 Perhaps that should be "wooly aphida". (What a wally1)Grumpy Link to comment Share on other sites More sharing options...
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