Answer: First of all, are you sure the "black pest" is an insect? Could it be a fruiting body of a fungus instead. The tomatoes sound like they had one of the blights that affect tomatoes. It's possible that if it were an insect, it transmitted the fungal blight. As for the strawberries, they sound like they have a disease also. It sounds very much like a mosaic disease, with is a bacterial problem that is transmitted by aphids, leaf hoppers, or other pests.
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