Two kinds of host tissue

Host tissue is either seasonal or long-term. Seasonal tissue occurs in an annual species in which all tissues, except the seed, die at the end of the growing season. It also occurs in the leaves of a deciduous tree or shrub. The significance of this in a pathosystem context is that the parasite is faced with the problem of a discontinuous pathosystem (see 4.11), and of surviving a period without host tissue.

Long-term host tissue occurs in evergreen trees, many perennials, and the timber and roots of deciduous trees. These are tissues that endure for several, possibly many, over-lapping seasons, and they are continuously available to the parasite.

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