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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]
Apple picking is an activity found at apple farms. Apple orchards may be opened to the public, allowing consumers to pick their own apples or purchase pre-picked apples. [1] [2] Although this is ultimately a method of purchasing apples, it is often a social activity as well. Apple picking is often a very popular dating ritual in the American ...
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.
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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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The upper surface is light to dark green. Leaves of the A. glabra are said to have a distinct smell, similar to green apples, that can distinguish it from mangroves. [4] The fruit is oblong through spherical and apple-sized or larger, 7–15 cm long and up to 9 cm diameter, and falls when it is green or ripening yellowish. It disperses by ...