On-Tree Storage of Fruit Quality of SRA63 Clementine with Triclopyr (3,5,6-trichloro-2-pyridyloxyacetic acid) Applications
Twenty-year old trees of SRA63 Clementine, growing on Carrizo Citrange rootstock, were submitted to different treatments with the aim to reduce fruit drop during maturation and to slow peel senescence, thus maintain good fruit quality on tree. Six treatments were compared: 1) 10ppm triclopyr (3,5,6-trichloro-2-pyridyloxyacetic acid) ; 2) 10ppm triclopyr mixed with 1 kg/hi of mineral oil (80％ grade) ; 3) 10ppm triclopyr mixed with 0. 2kg/hl of mineral oil (80％ grade) , and lOppm of gibberellic acid; 4) 16ppm 2,4-D (dichlorophenoxyacetic acid) ; 5) untreated test; 6) lOppm triclopyr when fruit diameter ranged between 18 and 22 mm (July 7th). The first four treatments were performed when fruits showed colour turning on 50％ of the peel (November 20th). The following data were recorded: yield per tree; natural fruit drop until harvest; fruit quality by morphological and chemical analysis (peel colour, juice content, total soluble solids, and acidity) performed every 20 days of the last ripening stage. Peel colour turning was slower in fruits treated with mineral oil (treatments 2 and 3)than in fruits treated with 2,4-D (treatment 4). Percentage of dropped fruits was higher in untreated control with at least 3. 5％ more fruit drop than other treatments. The lowest level of fruit drop (1.4％)was observed in the treatment 6 (early spray with triclopyr). Average fruit weight was little affected by treatments and the highest value (94 g) was recorded in the treatment 1, while the treatment 6 showed the lowest value (86 g) and the highest yield per tree. The treatment 6 also showed the lowest juice content and ripening index (TSS/acidity). Early treatment with triclopyr slowed the acid degradation with respect to untreated control and to all other treatments. Results showed good control of natural drop and fruit senescence by all triclopyr treatments. Effects on fruit quality, however, may be different depending on the time of the treatment. At the stage of peel colour turning, triclopyr do not affect sugar and acids dynamics, but protect fruit peel against senescence. Moreover, early application of triclopyr after fruit set showed effects on peel senescence control and also on internal fruit palatability preservation.
Citrus Mandarins Fruit drop Senescence Treatments
Zurru R. Mulas M. Deidda B. Piras F.
AGRIS Sardegna-Department of Wood and Fruit Tree Research-Via Mameli, 126/d, 09123 Cagliari, Sardegn Department of Economics and Tree Systems-University of Sassari-Via Enrico de Nicola 9, 07100 Sassari
国际会议
11th International Citrus Congress(第11届国际柑橘大会)
武汉
英文
1388-1391
2008-10-01（万方平台首次上网日期，不代表论文的发表时间）