Articles
EFFICACY OF POSTHARVEST TREATMENTS FOR REDUCTION OF MOLDS AND DECAY IN FRESH MICHIGAN CHESTNUTS
Article number
866_76
Pages
563 – 570
Language
English
Abstract
In Michigan where chestnut (Castanea spp.) cultivation is a pioneering industry, postharvest molds are responsible for significant economic losses.
Molds contaminate chestnut before and at time of harvest and are exacerbated during transportation and storage.
Consequently, various chemical sanitizers for fresh produce were evaluated for their effect on management of postharvest chestnut shell mold, kernel decay and weight loss during storage.
Treatments were evaluated with chestnuts randomly collected after harvest from seven Michigan growers.
Each treatment was repeated four times with 2.3 kg chestnuts per replication.
Per replication a sub-group of 10 chestnuts was randomly picked and evaluated for microbiological quality (severity of shell mold and incidence of kernel decay) and weight loss.
Overall, 2,700-ppm hydrogen peroxide + 200-ppm peracetic acid (StoroxTM), and 0.15-ppm trifloxystrobin (Flint®) significantly reduced both mold severity on the shell and the incidence of internal kernel decay compared to the other products.
Other products and combinations of products may also play an important role in reducing the incidence of decayed kernels, even though they did not strongly reduce mold severity.
Among these, were 0.92-ppm ozone solution (Aqua Air Technologies®), 7.5-mg chlorine dioxide/g of chestnuts (ICA TriNova®), 100-ppm peracetic acid (LenntechTM), 0.2-M sodium metabisulfite, and 1,350-ppm hydrogen peroxide + 100-ppm peracetic (StoroxTM) acid in combination with 1,980-ppm caprylic acid, 1,333-ppm glycolic acid and 20-ppm capric acid (CAF-06TM). No product significantly reduced weight loss during storage.
Based on these findings 2,700-ppm hydrogen peroxide + 200-ppm peracetic acid (StoroxTM) and 0.92-ppm ozone solution (Aqua Air Technologies®) are best suited to protect against postharvest chestnut mold and kernel decay respectively when combined with good agricultural practices and postharvest management.
Molds contaminate chestnut before and at time of harvest and are exacerbated during transportation and storage.
Consequently, various chemical sanitizers for fresh produce were evaluated for their effect on management of postharvest chestnut shell mold, kernel decay and weight loss during storage.
Treatments were evaluated with chestnuts randomly collected after harvest from seven Michigan growers.
Each treatment was repeated four times with 2.3 kg chestnuts per replication.
Per replication a sub-group of 10 chestnuts was randomly picked and evaluated for microbiological quality (severity of shell mold and incidence of kernel decay) and weight loss.
Overall, 2,700-ppm hydrogen peroxide + 200-ppm peracetic acid (StoroxTM), and 0.15-ppm trifloxystrobin (Flint®) significantly reduced both mold severity on the shell and the incidence of internal kernel decay compared to the other products.
Other products and combinations of products may also play an important role in reducing the incidence of decayed kernels, even though they did not strongly reduce mold severity.
Among these, were 0.92-ppm ozone solution (Aqua Air Technologies®), 7.5-mg chlorine dioxide/g of chestnuts (ICA TriNova®), 100-ppm peracetic acid (LenntechTM), 0.2-M sodium metabisulfite, and 1,350-ppm hydrogen peroxide + 100-ppm peracetic (StoroxTM) acid in combination with 1,980-ppm caprylic acid, 1,333-ppm glycolic acid and 20-ppm capric acid (CAF-06TM). No product significantly reduced weight loss during storage.
Based on these findings 2,700-ppm hydrogen peroxide + 200-ppm peracetic acid (StoroxTM) and 0.92-ppm ozone solution (Aqua Air Technologies®) are best suited to protect against postharvest chestnut mold and kernel decay respectively when combined with good agricultural practices and postharvest management.
Publication
Authors
I.R. Donis González, D.W. Fulbright, E.T. Ryser, D. Guyer
Keywords
Castanea, quality, disease, rot, postharvest control
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