What's at the Bottom of My Vandas

[c123anderson]

I am trying to figure out what I'm seeing at the bottom of some of my vandas. I've included two pictures of the same plant. What it appears like is almost a fraying/ruffles on the edges of the leaves.

Background: mealybugs found and treated with insecticide (4x at weekly intervals, rotating types.)

Is this 1) insecticide residue, 2) burned leaf/roots, 3) damaged plant, 4) mealybugs?

I am using isoprophyl alcohol on a swab to treat in case it's still mealybugs. I'm afraid it's drying the leafs out and causing this.

Note: I'm also noticing something similar on my cymbidium. Not all my vandas are having this issue, though. And I'm not seeing other evidence of current mealybugs, just leftover damage.

And I posted in this forum 1) mealybugs addressed here earlier and 2) is it possibly some other pest or disease.

[estación seca]

Leaves can get damaged edges like this down at the base. The photos aren't clear enough on my phone but I think that's just from scratching and rubbing.

[c123anderson]

So would the isopropyl alcohol do more damage?

[Ray]

Probably not, but if you apply it too often, it can dry out the tissues.

It’s probably doing nothing beneficial, either.

[c123anderson]

Originally Posted by Ray

Probably not, but if you apply it too often, it can dry out the tissues.

It’s probably doing nothing beneficial, either.

Thank you, Ray. Maybe trust the insecticide has done its job and just keep a watch for problems. Let the plants heal and grow.