I've got a small Schinus molle tree, I hope I spelled that correctly, that is covered in scale monsters. I've tried systemic pesticide and a spray meant to kill these pests, but nothing has worked, I did the alternating application to foil their particular life cycle. The spray nearly killed the tree, but the bugs survived. Anyone have a good idea other than fire? I think the tree is lost for the purpose I wanted, a food plant, it's about 2 feet tall and fairly bushy, should I trash it and get another? These trees are hard to find, at least in Oregon, I bought it from Etsy.. only place I could find, even Ebay was a wash.
As you can see scales are difficult to control. The systemic insecticide (Imidclorprid) should do a good job on the existing scales. Keep in mind they will stay on the tree even if they are dead, they do not fall off as the scales mouthparts are embedded in the stems so the scale will die but stay on the tree. The scale lays its' eggs under the scale and when the egg hatch (crawlers) these are the only stage susceptible to a spray treatment of the tree, so you need to time the foliar application to when the crawlers are active. If the tree is small as you say, you can put it in a large sealed trash bag with a nopest strip for 4 or 5 days and that should fumigate any of the scales that are still alive on the tree.
Note that systemic insecticides may well be active in the plant for several months or even years, which could render it useless as a larval food plant.
I know, systemic insecticide was a last ditch attempt, and I know how it works. I might try the bag and a pest strip, the life cycle is built to last though. Tough little guys and gals. I've even taken the time to go over every stem and leaf and smush the offenders, but all that did was make my hands sticky.
Last Edit: Jan 18, 2021 19:53:10 GMT -8 by kevinkk