Deffo caterpillar damage.
You can spray with a systemic insecticide, but be warned, not all caterpillars will die. It pays to run a regular eye over orchids that have been outside. Do it with a pair of forceps to hand, as when disturbed, the caterpillars will drop out of the leaf and escape, and if you use your fingers, you might miss and they will escape.
Very often they are hard to spot, as they use the silk to glue two leaves together.
In short any silk on an orchid should be investigated thoroughly.
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Threaded Mode
