The cambium and its "zone" is a cell generator (reproductive tissue called growth meristem) that produces both the inner bark cells of the phloem and new living wood cells in the xylem.

Numerous insects and pathogens extract nutrients from phloem tissue buried deep inside plants. These phloem-feeding insects and pathogens cause tremendous economic losses worldwide and represent ...

Citrus trees affected by HLB exhibit a progressive degeneration of the phloem tissue that results in partial or total phloem collapse. However, in trees known to have been infected with HLB for ...