Dragonfli very kindly sent me a replacement supply of these nematodes after an earlier, unsuccessful attempt to control a severe infestation on my Murraya Koenigii (Curry Leaf Plant). I had resorted to spray to stop the plant being ruined, however shortly afterwards the spider mites began to re-appear. I hung replacement sachets on the plant. At first I couldn't tell the mites from the nematodes, but when I looked again only a few hours later, there was no sign of any creature. As described in the instructions, every sign of spider mite had vanished, including the webs. A very satisfactory result and excellent customer service.