Hot-water treatments of potted palms to control the burrowing nematode, Radopholus similis

Tsang, M. M. C.; Hara, A. H.; Sipes, B. S.

doi:10.1016/s0261-2194(02)00235-1

Cited by 18 publications

(16 citation statements)

References 4 publications

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“…Thermal treatments by hot air, hot water, or steam are extensively used as MeBr alternatives to control insect pests in agricultural commodities because heat disinfestation treatments are relatively easy to apply, leave no chemical residues, and may offer some fungicidal activity (Tsang et al, 2003;Lurie et al, 2004;USDA-APHIS-PPQ, 2009;Gao et al, 2011). Research conducted in Guatemala showed that heat is an effective treatment for control of insects in coffee beans during sun drying and mechanical drying (Hernandez-Paz and Sanchez de Leon, 1972).…”

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confidence: 99%

Coffee Bean Heating Uniformity and Quality as Influenced by Radio Frequency Treatments for Postharvest Disinfestations

Pan¹,

Jiao²,

Gautz³

et al. 2012

Transactions of the ASABE

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Developing effective and economically viable treatments that replace chemical phytosanitary and quarantine practices is urgently needed for the coffee bean industry to maintain competitiveness in domestic and international markets. The objective of this study was to determine coffee bean heating uniformity and quality as influenced by radio frequency (RF) treatments for postharvest disinfestations. A pilot-scale, 27 MHz, 6 kW RF unit was used to study RF heating uniformity, develop a treatment protocol, and evaluate quality attributes in treated coffee beans. After comparing three selected electrode gaps, an appropriate gap of 14 cm was obtained to raise the central temperature of 2.75 kg samples to 48°C using RF energy by 4.6 min, compared to more than 237 min for samples to reach only 45°C when using forced hot air at 48°C. RF heating uniformity in bean samples was improved by adding forced hot air and back and forth movements on the conveyor at 0.89 m min -1 . The final temperatures reached 50.4°C in the interior of the sample and 50.6°C on the sample surface, resulting in small uniformity index values of 0.023 to 0.060 for the interior temperature and 0.073 for surface temperature distributions. RF treatments combined with forced hot air at 48°C to hold the target temperature for 10 min followed by forced room air cooling through a 3 cm product layer provided good bean quality. No significant differences in weight loss, moisture content, and color were observed between RF treatments and unheated controls.

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confidence: 99%

Coffee Bean Heating Uniformity and Quality as Influenced by Radio Frequency Treatments for Postharvest Disinfestations

Pan¹,

Jiao²,

Gautz³

et al. 2012

Transactions of the ASABE

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“…Nematode-free cormlets could be produced via in vitro micropropagation and nematodeinfected cormlets could be disinfected via heat treatment. Thermotherapy has proven effective in eliminating R. similis from infected palms and Anthurium (Tsang et al, 2003;Arcinas et al, 2004). …”

Section: Disease Symptomsmentioning

confidence: 99%

Corm rot of giant swamp taro (Cyrtosperma merkusii) caused by the burrowing nematode Radopholus similis (Nematoda: Pratylenchidae) in the Pacific

Murukesan

Berg²,

Tiedt³

et al. 2005

Nematol

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The association between the burrowing nematode Radopholus similis and giant swamp taro is studied in detail for the first time in corms collected from swampy taro patches in Yap, one of the states of the Federated States of Micronesia. The R. similis population from Yap displays similar variation in morphometrics and morphology as reported in the literature. The rot caused by the nematodes is wet with a loose mass of brown dead tissues and a deep brown necrotic centre housing nematodes inside. Usually, the infected tissues spread a disgusting odour typical of this disease. The dead tissues progress into shallow to deep cavities that advance towards the edible, central portion of the corm giving a perforated appearance on the outside of the otherwise smooth corm. The disease becomes more severe as the age of the plant increases. Nematode-infected plants seldom show any above-ground symptoms. The market quality of the corm is greatly reduced by the nematode damage. The widespread occurrence of the disease and the type of damage R. similis causes to the corms pose a serious threat to giant swamp taro production, food security and the continuation of traditional customs on those islands where R. similis occurs.

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“…After 3 months, each plant was removed from its pot, the roots were cleaned of all potting media with a jet stream of water, and the stems and leaves (tops) and roots were separated and dried at 60°C in a forcedair oven for approximately 7 days or until a constant weight was achieved. The dry weight of the tops and roots were determined to provide a quantitative in various size pots with and without plants showed that the hot water distributed uniformly and reached target temperature rapidly throughout the media and root mass (Tsang et al, 2001(Tsang et al, , 2003. Extreme caution was taken to prevent any passive contamination by irrigation, wind or human activity, and the plants had been placed in separate groups on clean, raised benches in a greenhouse.…”

Section: Expt 5 Hot Water or Hot Air Conditioning Prior To Hot Watermentioning

confidence: 99%

“…Effective control of plantparasitic nematodes was achieved with 50°C to 52°C water for 2.5 to 10 min (Birchfield & Van Pelt, 1958;Lear & Lider, 1959;Lear, 1966;McSorley et al, 1984;Nishina et al, 1992). Hot water treatment (50°C) by either a continuous hot-water drench of roots and media in pots or hot water dipping of barerooted plants was successful in eliminating burrowing nematodes in bamboo palms (15 min) and fishtail palms (13 min) with no heat injury to the plants (Tsang et al, 2003).…”

Section: Introductionmentioning

confidence: 99%

Efficacy of hot water drenches of Anthurium andraeanum plants against the burrowing nematode Radopholus similis and plant thermotolerance

Tsang

Kara

Sipes

2004

Annals of Applied Biology

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Hot-water drench treatments were evaluated for disinfesting roots of potted anthurium Anthurium andraeanum of the burrowing nematode Radopholus similis. A continuous drench of roots and media in pots with 50°C water for 5 to 20 min eliminated or reduced nematode populations to < 1 g -1 of dry root. A second hot water drench, 2 months after the first drenching, tended to increase the efficacy of the heat treatment. A few survivors persisted in the roots and/or stems of a few plants 2 to 4 months after heat treatment. Non-treatment of the shoots and possible migration from stem to root tissues are probable causes of nematode survival. Drenching potting media and roots in pot were as effective against R. similis in the roots as hot water dipping bare-rooted plants. Plant response to hot-water drenching varied among cultivars, but most exhibited tolerance to the heat treatments. Visual inspection of the plants showed little difference between treated and untreated plants in the heat tolerant cultivars. However, all heat-treated 'Marian Seefurth' plants, especially hot water-dipped bare-rooted plants, appeared to suffer some degree of growth reduction as measured by lower root and stem dry weights when compared to untreated plants 3 months after treatment. Conditioning anthurium plants with hot water or hot air prior to hot water drenching did not benefit plant quality when compared to unconditioned, heat-treated plants.

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Hot-water treatments of potted palms to control the burrowing nematode, Radopholus similis

Cited by 18 publications

References 4 publications

Coffee Bean Heating Uniformity and Quality as Influenced by Radio Frequency Treatments for Postharvest Disinfestations

Coffee Bean Heating Uniformity and Quality as Influenced by Radio Frequency Treatments for Postharvest Disinfestations

Corm rot of giant swamp taro (Cyrtosperma merkusii) caused by the burrowing nematode Radopholus similis (Nematoda: Pratylenchidae) in the Pacific

Efficacy of hot water drenches of Anthurium andraeanum plants against the burrowing nematode Radopholus similis and plant thermotolerance

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