Gymnosporangium clavipes is a widespread rust (fungus) that infects over 480 species in 11 genera. Also called cedar quince/hawthorn rust, G. clavipes is heteroecious, meaning that it requires two alternate hosts to complete it life cycle. One host, various members … Continue reading
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Witches’ brooms on plants are an abnormal cluster of twigs or shoots arising from a single point on a stem or branch and can be caused by physical injury or the invasion of an organism. Mistletoes (see “Mistletoe“, one of … Continue reading