The <i>in vitro</i> sensitivity of some species of Chlorophyceae to a selected range of herbicides

Abstract

Summary A survey was undertaken to establish the sensitivity of seventeen algal strains belonging to the Chlorophyceae to a selected range of herbicides up to a concentration maximum of 10 ppm under in vitro conditions. The herbicides were found to vary considerably in their toxicity to algae and a sequence was established based upon the magnitude of this toxicity: diuron &gt; bromacil &gt; paraquat&gt; monuron&gt; diquat&gt; linuron&gt; 2, 4‐DB &gt;barban&gt; dicamba, dichlobenil, dalapon, picloram&gt; bromoxynil, 2,3,6‐TBA &gt; 2.4‐DP. 2,4,5‐T and EPTAM. Of the algae, the most sensitive genera were Hormidium and Haematococcus, and the strain most sensitive to a wide range of herbicides was Hormidium barlowi (strain 335/la).