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Hire mold consultants Phillip Fry and Divine Fry to find air conditioning mold, workplace mold, and mold hidden inside the walls, ceilings, floors, crawl space, attic, basement, and HVAC equipment and system of your house, condominium, office, workplace, or other building anywhere in Chandler, Flagstaff, Mesa, Peoria, Phoenix, Scottsdale, Tempe, Tucson, and anywhere else in Arizona.  Lead Test Kits Mold Training  Mold Inspector Directory  Industrial Hygienist Training  Industrial Hygienist Directory  Mold Inspection Questions & Answers

Killing Mold On Grapes with Ozone Air

A U.S. Department of Agriculture study proves that fumigation with ozone air can control post harvest pathogenic fungi on commodities that tolerate this gas, or it can be applied to disinfect processing equipment and storage rooms when the produce is not present.

Toxicity of ozone gas to conidia of Penicillium digitatum, Penicillium italicum,and Botrytis cinerea and control of gray mold on table grapes

by Ragip Ozkana and, Joseph L. Smilanickb,, Ozgur Akgun Karabuluta, Department of Plant Protection, Faculty of Agriculture, Uludag University, 16384 Gorukle-Bursa, Turkey and the United States Department of Agriculture, San Joaquin Valley Agricultural Sciences, 9611 South Riverbend Avenue, Parlier, CA 93648, USA

a b s t r a c t

Penicillium digitatum, Penicillium italicum, and Botrytis cinerea attack fresh fruit and cause significant

postharvest decay losses. The toxicity of ozone (O3) gas at different relative humidities to control their

conidia was determined. Conidia distributed on cover glasses were exposed to an atmosphere containing

200–350LL1 of O3 gas at 35%, 75%, and 95% relative humidity (RH) at 25 C. O3 gas was produced by

UV light generators and passed through three 500mL solutions of saturated MgCl2 (35% RH), NaCl (75%

RH), or K2SO4 (95% RH). O3 and RH inside the chamber were monitored. O3 exposures were quantified as

concentration × time products adjusted to 1 h (LL1 ×h). After exposure to O3 for varying periods, the

conidia were removed from the chamber, placed on potato dextrose agar and their germination observed.

Conidia died more rapidly at higher humidity than at lower humidity, and P. digitatum and P. italicum

were more resistant to O3 than B. cinerea. At 95% RH, 99% of the conidia of P. digitatum, P. italicum, and B.

cinerea were incapable of germination after O3 exposures of 817, 732, and 702LL1 ×h, respectively.

At 75% RH, similar inhibition required exposures of 1781, 1274, and 1262LL1 ×h, respectively. At

35% RH, O3 toxicity declined markedly, and 99% mortality required 11,410, 10,775, and 7713LL1 ×h,

respectively. These values can be used to select O3 gas exposures needed to control these conidia. Conidia

of B. cinerea were sprayed on to the surface of table grapes and 2 h later the grapes were exposed to

800–2000LL1 ×h of O3. O3 at 800LL1 ×h or more reduced the incidence of infected berries by 85%

and 45% on ‘Autumn Seedless’ and ‘Scarlet Royal’ grapes, respectively. Fumigation with O3 can control

postharvest pathogenic fungi on commodities that tolerate this gas, or it can be applied to disinfect

processing equipment and storage rooms when the produce is not present.

© 2011 Elsevier B.V. All rights reserved.
 

Hire mold consultants Phillip Fry and Divine Fry to find air conditioning mold, workplace mold, and mold hidden inside the walls, ceilings, floors, crawl space, attic, basement, and HVAC equipment and system of your house, condominium, office, workplace, or other building anywhere in Chandler, Flagstaff, Mesa, Peoria, Phoenix, Scottsdale, Tempe, Tucson, and anywhere else in Arizona.  Lead Test Kits Mold Training  Mold Inspector Directory  Industrial Hygienist Training  Industrial Hygienist Directory  Mold Inspection Questions & Answers


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