tobacco mosaic virus, mosaic pattern of discolouration on leaves, cells are destroyed and can't photosynthesise, Agrobacterium tumefaciens, stop translocation of sugars in the phloem, crown galls/tumours on stems, rose black spot , black spots on leaves, less photosynthesis and flower growth, root knot nematodes, damaged roots, less water and minerals absorbed, aphids, damages stems, lots of green bugs on them, pierce the phloem and act as disease vectors, stunted growth, plants can't make amino acids and lack protein for growth, chlorosis - yellow leaves, magnesium needed to make chlorophyll, without this plants cannot trap light.

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