Answer: As a plant drops older leaves, sending out new growth to compensate for the lost photosynthesizing ability is typical. There are many types of scale. Horticultural oil is used against most soft-bodied scale, but is not always 100 percent effective. In the immature "crawler" stage, insecticide works better. You might also try wiping the leaves individually to remove as much of the scale as possible. Don't forget to treat underneath the leaves, where scale often hang out. Unfortunately, scale can overwinter on plants and basically reproduce year around, so you have to keep at it. As for the wilting, has your plant been in the same pot? It might be rootbound and water isn't soaking the roots and soil, instead running out of the pot. You might consider transplanting into fresh soil. If the roots are wrapped around each other, carefully score the rootball vertically, or unwrap them. Hope this info helps.
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