The distribution of a systemic organophosphorus pesticide (mephosfolan) between leaves on hop plants after soil application

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Abstract
Mephosfolan was applied as a soil drench to two groups of plants, grown in a commercial hop garden and at a Research Station. In all plants the highest concentrations occurred in the older leaves with progressively less in younger leaves. The latter had approximately the same concentration whether on the main bines or laterals of either group of plants. The vigorous commercial plants, cv Target, accumulated extremely high maximum concentrations in the older leaves, about four times the level in the older leaves of the Research Station plants, cv Northern Brewer, which were slightly less than normal size.

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