What is the mode of action?
Corvus combines the strength of two sites of action to take down weeds. The first, commonly known as a bleacher, inhibits the 4-hydroxyphenylpyruvate dioxygenase (HPPD) enzyme, which is key to the production of pigments and development of chloroplasts in plant tissues. By inhibiting pigment and chloroplast biosynthesis, emerging plant tissue is bleached from green to white or pale yellow and ultimately dies. These symptoms often appear after a half-inch or more of rain on weeds that emerged during a dry period following planting. The second mode of action is the inhibition of the acetolactate synthase enzyme, which results in the inability of weeds to produce three essential branch-chain amino acids. Lack of amino acids prevents the production of the plant proteins required for normal growth and development, which ultimately results in weed death.