Pests Destroying Vegetables and Flowers
I have a major problem with plants being destroyed by some sort of bug or at least I think it’s an insect of some sort. I have had trouble with slugs in the past and this issue is definitely not caused by slugs or snails. There is a silver residue on what remains of the leaves plus a black substance that looks like excrement. I have tried sprays both chemical and more recently organic. I have tried companion planting e.g. marigolds in the same bed as courgettes without success. Can anyone throw some light on what the problem is and what can be done about it.