Look at the underside of leaves for tiny pale speckles, fine webbing and moving dots. Hot, dry air suits them well, which is why a tent running warm and dry gets hit first. Most failures come from treating once and stopping: eggs hatch, so repeat the treatment on the schedule on the label, or release predatory mites such as Phytoseiulus persimilis and keep the tent a bit more humid so they can work.
Look at biological control and pest control, and follow local rules and the label, especially once flowers have started.
Comments