... service 3.Professional supplier NOMENCLATURE 2,4-DCommon name2,4-D (BSI, E-ISO, (m) F-ISO, WSSA); 2, ... to prevent this. Photolytic DT50 (simulated sunlight) 7.5 d. pKa2.73 APPLICATIONS BiochemistrySynthetic auxin (acting like indolylacetic acid). ... in citrus fruit. PhytotoxicityPhytotoxic to most broad-leaved crops, especially cotton, vines, tomatoes, ornamentals, fruit trees, oilseed rape and beet. ...