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Though it is thought to have arrived on a budwood cutting, not a seed, a disease from Asia named citrus greening threatens the country’s entire citrus industry, valued at $3.35 billion annually.

It showed up first in a Hacienda Heights backyard, on a pummelo branch derived from budwood that had been smuggled from China, where the disease is epidemic.

One common symptom in trees struck by rapid decline is dead tissue at the graft union, the part of the trunk where the fruit-bearing budwood of an apple variety is joined to hardy rootstock to create new trees.

She planted petit manseng the same year Horton did, using budwood provided by Virginia Tech.

The Spokesman-Review newspaper reports that Phytelligence, which has a method of growing “budwood” from tissue cultures that enables them to reach maturity and bear fruit in less time, struck a “propagation agreement” with the university that allowed the company to cultivate the Cosmic Crisp for research purposes.