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Damage from mites, such as spider mites (A, on brachiaria) can be easily mistaken for nitrogen deficiency (B, in carambola) or sulfur deficiency (C, in pigeon pea). A hand lens or microscope can aid in determining if mites are present on the leaf surface. Nutrient deficiencies will often follow set patterns either affecting only old or new leaves or have a uniform pattern of necrosis around leaf edges, leaf tips, or yellowing between leaf veins.