The morphology, species frequency, spore density and natural infection rate of the VAM fungi in tea gardens were studied in the southern parts of Henan province.

对豫南茶园VA菌根真菌形态、种类、种群频度、孢子密度及自然侵染率进行观察与测定。

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Both the change in the death rate and the change in the infection rate are partly a consequence of the natural flow and ebb of any epidemic infection.

ECONOMIST: AIDS