1959 Volume 24 Issue 2 Pages 119-121
Streptomycin applied to the tobacco plant stem by rubbing, or absorbed to cotton-wool banded around bottom of the stem, was readily translocated to the upper plant leaves, when used at a concentration of 1000mcg/ml streptomycin solution. At higher concentrations the streptomycin was translocated to most of the leaves, gradually to the lower leaves and in least amount, next to the middle leaves and most to the upper leaves.
The total quantity of streptomycin applied to tobacco leaves by surface absorption was retained following immersion of the leaves in tap-water for eight hours; and little reduction was noted after twenty-four hours' immersion. Rain or dew will be unlikely to remove streptomycin from the leaves.
