Tiny, Clear Spheres

Question

My greenhouse vine has tiny, clear spheres on the underside of its leaves and on green parts of its stem. What are they?

Answer 1

There may be pests on the plant. They can make the leaves "drip". These articles are on the pests that can cause that:
https://www.gardeningknowhow.com/plant-problems/pests/homemade-aphid-control-a-natural-way-to-kill-aphids.htm
https://www.gardeningknowhow.com/plant-problems/pests/scale-bug-how-to-control-plant-scale.htm
https://www.gardeningknowhow.com/plant-problems/pests/mealybugs-white-residue-on-plants-leaves.htm

Treat the plant with neem oil to fix the pest issue and any fungal issues that may develop as well. Here is more info: https://www.gardeningknowhow.com/plant-problems/pests/pesticides/neem-oil-uses.htm