If we could garden without any interference from the pests which attack plants, then indeed gardening would be a simple matter. But all the time we must watch out for these little foes little in size, but tremendous in the havoc they make. As human illness may often be prevented by healthful conditions, so pests [...]

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The devices and implements used for fighting plant enemies are of two sorts: (1) those used to afford mechanical protection to the plants; (2) those used to apply insecticides and fungicides. Of the first the most useful is the covered frame. It consists usually of a wooden box, some eighteen inches to two feet square [...]

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