Evaluation of a new disinfectant for control of citrus postharvest diseases
M. Mitidieri, V. Saliva, V. Brambilla, E. Piris, A. Miranda, N. Mancuso and A. Valenzuela.
Journal of Plant Pathology Volume 90 (2, Supplement) August 2008, Book of Abstract, 9th International Congress of Plant Pathology, August 24-29, 2008 Torino,Italy,. 507 pages.
2008
บทคัดย่อ
Evaluation of a new disinfectant for control of citrus postharvest diseases
The development of safe postharvest treatment alternatives is a human health and environment protection concern and a key for fresh citrus fruit export. The objective of this experiment wasthe evaluation of a new disinfectant: PHMG poly-hexametilenguanidine,provided by Diransa San Luis S.A. under two formulations (hygisoft pH and hygisoft V-20). Treatments were applied by dipping orange fruits (cvWashington Navel) for two minutes in one of the following: 200 ppm sodium hypochlorite, 0.5% or 1% hygisoft pH, 1% hygisoft V-20, 3% sodium bicarbonate, 1 or 4 % peracetic acid, 0.5% or 1% hygisoft pH in combination with 3% sodium bicarbonate. Fruits were conditioned in cages of 20 units and stored for 45 days in a packinghouse storage chamber at 4°C. A completely randomized design was used with four repetitions. Thein vitroeffect of Hygisoft pH and Hygisoft V-20 on a suspension of the bacteriumXanthomonas axonopodispvcitri,the causal agent of citrus canker, was also assayed. After 45 days of storage, 1% hygisoft V-20 and 0.5% or 1% hygisoft pH in combination with 3% sodium bicarbonate, significantly decreased green mould incidence caused byPenicillium digitatum. The values registered were 1.25%, 5% and 6.25% for these treatments respectively whereas Green mould incidence for the untreated control was 28.8%. Hygisoft pH and Hygisoft V-20 (1 or 2%) inhibitedXanthomonas axonopodispvcitri in vitrogrowth in three assays. The experiment will be repeated in order to assess the potential of these disinfectants for control of citrus postharvest decay.