Masters Theses

Date of Award

8-1981

Degree Type

Thesis

Degree Name

Master of Science

Major

Food Science and Technology

Major Professor

F. A. Draughon

Committee Members

H. O. Jaynes, P. M. Davidson

Abstract

Aflatoxin production and Aspergillus flavus growth appeared to reduce as insecticides concentration increased from 10 mg/liter (ppm) to 100 ppm concentration. The insecticide naled completely inhibited production of afla-toxin B1 and growth of A. flavus at 100 ppm. The insecti-cides bux, carbaryl, and dyfonate significantly (P = 0.05) inhibited production of aflatoxin B1 by 97, 55 , 64% respectively, at 100 ppm. However, at a concentration of 10 ppm, significant inhibition in production of aflatoxin B1 was found only with naled and dyfonate. Carbofuran did not significantly inhibit aflatoxin production even at 100 ppm. The insecticides bux, carbofuran, dasanit, and EPN showed significant (P = 0.05) inhibition of A. flavus growth by 53, 50, 24, and 20% respectively at 100 ppm concentra-tion. Field samples inoculated with A. flavus but not treated with insecticide showed an increase in aflatoxin B1 production in all experiments. Treating uninoculated corn with the insecticides bux and naled did not reduce toxin pro-duction, however, treating uninoculated corn with carbaryl did significantly reduce toxin production. Although car-baryl and naled appeared to reduce toxin production in inoculated corn, this reduction was not found to be signif-icant due to experimental variation. Since the insecticide carbaryl reduced aflatoxin B1 production in uninoculated corn significantly, it may be of value under field con-ditions when spore loads are low.

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