The leaves, roots and stems do not vary in dermatitogenic capacity throughout the year and plants collected from ... It is, however, probably easiest to contact poison ivy dermatitis in the spring when leaves are tender and will bruise most easily. ... soon enough to prevent some dermatitis in sensitive individuals but it is useful in that it prevents the spread of the sap to ... According to Klingman (1958), there is a great amount of variability in sensitivity, not only from person to person butanbsp;...
|Title||:||The Biology of Canadian Weeds|
|Author||:||Mulligan, Gerald A.|