Aflatoxin B₁ contamination in commercial varieties of apple and pear fruits infected with Aspergillus flavus Link ex Fries.

摘要

Aflatoxin contamination of pear (cultivars Williams and Chinese Sandy) and apple (cultivars Red Delicious and American Apirouge) fruits infected by A. flavus was studied. Among the 20 rot-causing A. flavus isolates recovered from diseased apple fruits, 12 were aflatoxigenic. Fruits of Red Delicious were less susceptible to aflatoxigenic strains (40.0%; aflatoxin B₁ production of 312-796 micro g/kg) than the fruits of American Apirouge (80.0%; aflatoxin B₁ production of up to 1405 mg/kg). Of the A. flavus isolates obtained from pear fruits, 65% were aflatoxigenic (aflatoxin B₁ production of 734-1280 micro g/kg). The pathogenicity of the isolate was not significantly correlated with its aflatoxin production potential.