[pik-luh-ram, pahy-kluh-]
noun Chemistry.
a colorless powder, C 6 H 3 Cl 3 N 2 O 2 , used as a systemic herbicide for controlling annual weeds and deep-rooted perennials on noncrop land.

1960–65; reverse compound from am(inotrich)lor(o)pic(olinic acid); see amino-, tri-, chloro-, picolinic

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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Picloram is moderately to highly persistent in soils.
Picloram also breaks down in sunlight which reduces its residual activity.
Although picloram overcomes the effects of weather, it does not fully overcome the effect of growth stage.
Controlled burning and application of the herbicide picloram have also been effective.
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