New Minor Components of Host-Selective ACTG-Toxin and a Novel Sesquiterpene Produced by a Pathotype of Alternaria citri Causing Brown Spot Disease of Mandarins

Abstract

Two minor components of host-selective pathotoxins, ACTG-toxins G and H, and a novel sesquiterpene, Compound A, were isolated from the culture broth of Alternaria citri, a fungus that produces brown spot disease of Dancy tangerine (Citrus tangerina Hort. ex Tan.) and other mandarin cultivars (Citrus reticulata). Structures of ACTG-toxins G and H were determined to be anhydro-ACTG-toxins A and F, respectively. Structure of Compound A, including its absolute configuration, was determined to be dihydrosporogen AO-1. © 1989, Pesticide Science Society of Japan. All rights reserved.