Assessing the Efficacy of Preharvest Treatments to Control Water Spot in Clementine (Citrus reticulata Blanco)
In Italy the damage caused by water spot to the crop of Clementine mandarin is a cause of increasing concern to the citrus industry. The injury occurs during cold rainy periods in winter and the progress of disease depend on weather conditions. It is a typical disorder linked to peel senescence. This disorder can be partially controlled by application of gibberellic acid at fruit color break. Field trials were conducted in the fall of 2006 and 2007 in a commercial plantation of Clementine located at Mirto Crosia (Italy). Individual trees of good health, uniform size and yield were selected and tagged for use in the experiments. Treatments selected for evaluation were: 1)GA3 10 ppm; 2) Beeswax; 3)Chitosan 0. 5％ ; 4) GA3 10 ppm followed (15 days later) by Beeswax; 5) Chitosan 0. 5％ followed (15 days later) by Beeswax; 6) GA3 10 ppm plus Chitosan 0. 5％ ; 7) Untreated control. Each treatment was applied to five single tree replicates. In order to evaluate the effect of treatments on the fruit quality, initially (at treatment) and at 1 month interval until harvest, physicochemical parameters were determined on samples of 20 fruits for each treatment. Incidence and severity were determined on all fruits harvested per tree. Although not statistically significant, GA3 Beeswax and Chitosan reduced the disorder, compared to the untreated control. At harvest fruit treated with GA3 Beeswax, and GA3followed by Beeswax had statistically higher firmness and lower deformation. No statistically significant differences were found in all other physicochemical parameters. The role of weather conditions on the incidence of disorder is discussed.
Physiological disorder Gibberellic acid Chitosan Senescence
G. Lanza V. Aloisi D. Privitera A. Chiarenza
CRA- Centro di Ricerca per VAgrumicoltura e le Colture Mediterranee, Acireale, Italy
国际会议
11th International Citrus Congress(第11届国际柑橘大会)
武汉
英文
1304-1308
2008-10-01（万方平台首次上网日期，不代表论文的发表时间）