Mealy eating of tomatoes, seems to be usually caused by dry conditions and incorrect watering-and possibly too much nitrogen in the soil which directs the growth more at the leaves and stem rather than the fruit just at the critical point, a larger amount of potash and lots of water usually does the trick, high heat will also make some varieties mealy if in combination with the other mentioned elements.
One particular bad variety for this is german red strawberry, as is also stump of the world.
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