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The white powdery look you sometimes see on plants is mealy bugs that can infest plants after a lot of rain. Take a bowl and mix original Dawn soap and place it into a plastic hand held sprayer. The mix is 2 to 1 heavy on the soap; spray and let dry. If you have a really infested plant, rub the leaves with a soft cloth with this solution or dip into a bucket of solution and remove as much residue as possible. This is a natural solution smothering the scale or powder.
I just went to the garden store because I have mealybugs on my raspberry plants. I bought insecticidal soap. The owner said regular soap, such as Dawn, will kill the plant as well as the bugs.