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In deciduous trees, an abscission zone, also called a separation zone, is formed at the base of the petiole. It is composed of a top layer that has cells with weak walls, and a bottom layer that expands in the autumn, breaking the weak walls of the cells in the top layer. This allows the leaf to be shed. [7]
Gymnosporangium juniperi-virginianae is a plant pathogen that causes cedar-apple rust. [1] In virtually any location where apples or crabapples and eastern red cedar (Juniperus virginiana) coexist, cedar apple rust can be a destructive or disfiguring disease on both the apples and cedars.
The story behind Newton's apple tree can be traced back to Newton's time at Woolsthorpe Manor, his family estate in Lincolnshire, England. [20] [1] [2] During his stay at the manor in 1665 or 1666, it is believed that Newton observed an apple falling from a tree and began pondering the forces that govern such motion. [21]
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At first a brown spot, near the calyx, appears on the fruit. [2] The spot on the fruit then enlarges and black/brown rings appear on the fruit. The fruit holds its shape, however, unlike other fruit diseases. The fruit will then wither up and can remain on the tree for another year before falling off.
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