Susceptibility of Selected Crops to Simulated Imazethapyr Carryover: A Morpho-Anatomical Analysis

A bioassay study was conducted to determine the differences in susceptibility of selected crops simulated imazethapyr residues based on morphological and anatomical parameters. Sugar beet, white mustard, rapeseed oil were found be most sensitive ED50 values for root length fresh weight. Corn sunflower less sensitive, wheat least sensitive. The measured parameters confirmed different sensitivities tested plants, as evidenced by a shortening meristem elongation zones, reduction distance between tip absorption zone, point where primordium lateral appears. An residue level equivalent ED20 (for length) did not cause serious changes nor it significant cap, beginning zone (root hair region), formation (i.e., permanent number primordia per length. Therefore, could proposed an acceptable (ARL) or herbicide at which these plants can safely sown.