>>2574178>how young are your saplings?I grafted them a year ago, now they're ~60cm tall and grow new twigs.
>when you see foam on grass at the junctions of leaves and stems it's their drool in which they lay their eggsNot all hoppers do that, and not only hoppers do that (I've heard that grasshoppers do that as well).
Those hoppers that do are apparently called 'spittlebugs' (
https://en.wikipedia.org/wiki/Aphrophoridae), and spittlebugs present in my country have green nymphs.
>seems unlikely to me they would feed on something which contains lignin such as your saplings, they usually stick to tender stuffI wouldn't say so, rose leafhoppers feed on roses, rhytidodus species feed on aspen etc.
I'm quite concerned about this because most of these f**king hoppers transmit diseases from tree to tree, including viral diseases that don't spread naturally.
