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Eradicants and mycorrhizae

The current literature includes a considerable number of papers reporting adverse effects of eradicants on the development of symbiotic, mycorrhiza-forming fungi with subsequent reduced growth of nursery stock (1, 2, 3, 4, 5). It is safe to state that nearly all eradicants, even when used at the generally accepted rates of application, depress for a brief period the activity of these beneficial, in fact, essential microorganisms. However, according to our observations, a harmful, i.e., long lasting immobilization of mycorrhizal fungi takes place in nursery soils in some instances, at irregular intervals, and usually in a mosaic-like pattern. The causes of this occasional demycorrhization of the soil are not clear, but an experience with the 1973 fall seeding in the Griffith state nursery of Wisconsin provided a striking illustration of some factors responsible for the deterioration of mycorrhizae.

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Author(s): K. E. Wojahn, Jaya G. Iyer

Publication: Tree Planters' Notes - Volume 27, Number 2 (1976)

Volume: 27

Number: 2