Moisture Extremes Bacteria Microscopic, single-celled plants with cell walls. Sub-microscopic particles consisting specific nucleic acid molecules covered with protein coats. Mycoplasmas have no cell walls. Reproduce by budding or fission, and are typically found in the phloem of host plants or trees. Air Pollutants Nematodes Minute to microscopic worms.
Fungi currently constitute the largest and best known group of tree pathogens.
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