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Relative Humidity of the ambient air.
Root-Knot Nematode: A root parasite that can be a problem for fruit trees.
a: the usually underground part of a seed plant body that originates usually from the hypocotyl, functions as an organ of absorption, aeration, and food storage or as a means of anchorage and support, and differs from a stem especially in lacking nodes, buds, and leaves
b: any subterranean plant part (such as a true root or a bulb, tuber, rootstock, or other modified stem)
Getting a cutting to grow roots using any number of methods.