When backlit by the sun our climbing rose ejects fluid which can be seen as glints of light as they rise about a centimeter or two before falling. What part of the rose is involved is difficult to determine. This has been phoographed on two separate hot evenings. Googling is of no help.
The videos are definitely amateurish but on further observation this evening I saw a torpedo-shaped green insect about a centimetre long on the centre vein of a leaf that was ejecting the fluid. My system doesn't seem to want to upload the video. Mystery, if there was one, appears to be solved.
The insect involved was, I believe, a variety of leaf hopper. It didn't seem to be harming the plant as it remained as healthy and vigorous as a rose in midsummer can be.
