| abstract |
This invention teaches a method of controlling weeds using the metabolites tenuazonic acid, iso-tenuazonic acid and their salts isolated from the cultures of Alternaria alternata (Fr.) Keissler. Spraying of any of these compounds at a concentration of 5 to 800 µg/g can cause main broad leaf, grassy and sedge weeds to hurt, wilt, and dry to death. Tenuazonic acid, iso-tenuazonic acid, and their salts exhibit herbicidal activity with broad spectrum, quick killing, and high efficiency. The addition of adjuvants improves the herbicidal activity of these compounds. |