Plum trees attacked by grey mite like creatures

one eye

we have two plum trees, Opal & Victoria.
To- day I discovered that they are infested with small grey mites and the leaves are sticky
Sprayed with Derris, will this help

Belfast · Posted: Mon Jul 13, 2009 1:16 pm Post subject:

Did it work ?

medieval knievel · Posted: Mon Jul 13, 2009 1:53 pm Post subject:

our kilmarnock willow is infested with bugs which match the above description - it's got very dense growth, though, and there's not much air getting through it, which i assumes gives them more shelter.