for scale.. i go high powered.. but i dont know if it is labeled for said use...

bayer tree and shrub ...

it is labeled for scale.. but i dont know about Euonymus

i got rid of all mine.. for this very reason .. it wasnt worth the repeated ... endless ... use of a systemic product ...
i suspect.. you could find a whole laundry list of variegated plants.. other than these.. if you looked hard enough ... outside the world of bigboxstore ...

ken

Beware of the problem associated with the imidacloprid pesticides (like the Bayer stuff). Population explosions of such pests as thrips and spider mites have been reported after its use, partly due to the resistance that has shown up in those and other species (like some beetles and whitefly).

Horticultural oils have long been the favorite 'go-to' product for scale insects and one of the few things I'd ever use prophylacticly on a susceptible plant species. Oil applications can be very successful on Euonymus, if used according to label directions.

The easiest form of prevention is avoidance :-) If euonymus scale is prevelent in your area, then perhaps euonymus is not the best go-to plant for you.

And while I hesitate to second guess anything Dorie/Rhizo has to say, I'd love to know how a hort oil can have prophylactic insecticidal properties. Doesn't the oil have to coat the insect and preferrably in its instar or crawling stages? My understanding is that hort oils have minimal residual effect (i.e., 24 hours, give or take) and do not provide a substantial feeding deterrant. So unless your timing is dead-on, the hort oil is not very efficient with scale control.