Shiro is a Japanese yellow plum. As with all varieties of plums, it suffers many problems such as plum curculio, mites, aphids, brown rot, leaf spot and black knot. In spring before growth begins, spray the plum tree with a fungicide as well as horticultural oil. This kills any fungi and pests over-wintering on plants. Treat insect problems year-round as they occur.
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Joyce Starr is a freelance writer from Florida and owns a landscaping company and garden center. She has published articles about camping in Florida, lawncare, gardening and writes for a local gardening newsletter. She shares her love and knowledge of the outdoors and nature through her writing.