Question
We have a 5 year old weeping willow that has been doing great until this year.  We live in Kyle, Texas.  We have been told it has scale. We sprayed it with a solution of 2 tablespoons of baking soda to a gallon of water directly on the leaves and 2 applications of ironite, 1 per recommendation on package and 1 double application over a two month period but have seen no improvement...HELP.  Thank you.

Answer
I products you mentioned will not work on scale insects. i would suggest using an insecticide.
Treat infested plants with insecticidal oils during the dormant season or with conventional sprays in spring and summer when young crawlers are actively moving on the plant. Application should cover both sides of leaves and all twigs and branches. Some proucts labeled for scale control include malathion, dimethoate (Cygon), acephate (Orthene), carbaryl (Sevin), befenthrin, cyfluthrin, resmethrin, insecticidal soap.
Check with your local nursery /garden type store for a systemic insecticide for scales on trees.