sentences:  It is also notable that the use of herbicides is not strictly selective of water hyacinths; keystone species and vital organisms such as microalgae can perish from the toxins and can disrupt fragile food webs.The chemical regulation of water hyacinths can be done using common herbicides such as 2,4-D, glyphosate, and diquat.The herbicides are sprayed on the water hyacinth leaves and leads to direct changes to the physiology of the plant.