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KMID : 0903619980390040423
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Journal of the Korean Society for Horticultural Science
1998 Volume.39 No. 4 p.423 ~ p.427
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Evaluation of Lime Sulfur Mixture as a Flower Thinner for Pear Trees (Pyrus pyrifolia cv. Niitaka)
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홍경희/Hong, Kyung Hy
장한익/김기열/최장전/한점화/이희재/Jang, Han Ik/Kim, Ki Youl/Choi, Jang Jeon/Han, Jeam Wha/Lee, Hee Jae
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Abstract
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Lime sulfur mixture was evaluated as a flower thinner on mature pear trees (Pyres pyrifolia cv. Niitaka). When lime sulfur mixture at a concentration of 0.3 Be´ was sprayed onto blossom clusters at full bloom of the first and the second flowers, and additionally at one day after full bloom of the third and the fourth flowers, it exhibited a significant thinning effect with respect to both the rate of fruit set and the proportion of fruiting cluster. Following its double application at 0.3 Be´ to blossom clusters, the rate of fruit set and the proportion of fruiting cluster were reduced to the levels of 48 and 62%, respectively, compared to those of the untreated control. The thinning effect of its double application at 0.3 Be´ was much greater on flowers from axillary buds than on flowers from terminal buds. Lime sulfur mixture sprayed onto the flowers on blooming day caused injury to pistils and petals in a concentration-dependent manner. Petal was found to be more susceptible to lime sulfur mixture than pistil. However, its injurious effect on pistil and petal greatly diminished when sprayed to the flowers which were artificially pollinated with pollens of ´Chuwhangbae´ pear trees. In addition, lime sulfur mixture at 0.2 or 0.3 B6 almost completely inhibited the germination of pollen tubes either on the stigma of ´Niitaka´ pear flowers or on the agar/sucrose medium, suggesting that the flower thinning effect of lime sulfur mixture is due to the consequence of the inhibition of pollen tube germination rather than the impairment of stigmas. Lime sulfur mixture sprayed to the blossom clusters did not affect the fruit shape uniformity and its index, and seed number of the subsequent fruits at harvest compared to the fruits developed after hand thinning practice. Furthermore, the fruits developed after hand thinning practice and after the double application of lime sulfur mixture at 0.2 or 0.3 Be´ had almost the same flesh firmness, soluble solids contents, and titratable acidity at harvest. Thus, lime sulfur mixture could be used as an effective flower thinner on pear trees if it is applied at adequate concentration and time.
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KEYWORD
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