Examples of perrenial allergies
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Perennial allergies are often a reaction to house dust. House dust may contain mold and fungal spores, fibers of fabric, animal dander, dust mite droppings, and bits of insects. Substances in and on cockroaches are often the cause of allergic symptoms.
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Foliar diseases - Botrytis, Xanthomonas, Pseudomonas, rust, leaf spot, powdery mildew, downy mildew. Root and stem diseases - Rhizoctonia, Phytophthora, Pythium, Sclerotinia, Sclerotium, Alternaria, canker, crown gall, vascular wilt.
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