With the coming of spring, warm temperatures and high moisture trigger the development of the telial stage in cedar apple rust. Teliospores are formed on the telial galls of the cedar host in such massive numbers that they form these gelatinous orange horns. The teliospores will produce the next spore stage in the rust life cycle through formation of a basidium, meiosis (reduction division), and production of basidiospores. The basidiospores will infect apple in order to continue the complex life cycle of the rust.
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