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The effects of dichlorprop and daminozide sprays in preventing preharvest fruit drop and the concentrations of endogenous IAA and ABA in 'Tsugaru' apple


, : The effects of dichlorprop and daminozide sprays in preventing preharvest fruit drop and the concentrations of endogenous IAA and ABA in 'Tsugaru' apple. Technical Bulletin of the Faculty of Horticulture, Chiba University ( 43): 229-237

Preharvest fruit drop in apple Tsugaru was decreased by spraying with 45 p.p.m. dichlorprop at 25 and 15 days before harvest or with a single spray of 2000 p.p.m. daminozide at 3-4 weeks after full bloom. A single spray of 45 p.p.m. dichlorprop or 400 p.p.m. daminozide had variable effects depending on the year.

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Related references

Tsukahara K.; Suzuki T.; Ono T.; Ohara H.; Matsui H.; Takahashi E.; Hirata N., 1990: Effects of dichlorprop and daminozide sprays on preventing preharvest fruit drop and the concentrations of endogenous iaa and aba in tsugaru apple. Effects of dichlorprop (2,4-DP) and daminozide (SADH) sprays on preventing preharvest fruit drop and the concentrations of endogenous indole-3-acetic acid (IAA) and abscisic acid (ABA) in 'Tsugaru' apple were examined. Preharvest fruit d...

Byun, J.K.; Jung, C.S.; Kim, J.S.; Kang, I.K., 1993: Effects of dichlorprop single, mixed or separate sprays with calcium salts on the preharvest fruit drop of 'Tsugaru' apples. The prevention of preharvest fruit drop in apple cv. Tsugaru using sprays of dichlorprop and/or calcium salts (acetate, chloride and hydroxide) was investigated. Some of the fruits were stressed by piercing through the calyx cavity into the flesh....

Byun JaeKyun; Chang KyungHo, 1995: Effects of leaf and fruit application of dichlorprop on preharvest drop, ripening, and ethylene forming systems in 'Tsugaru' apple fruits. Dichlorprop (45 mg/litre) was applied to leaves, fruits or leaves + fruits on 22 July (25 days before harvest). Application of dichlorprop to fruits had little effect on preharvest drop or ripening. Application of dichlorprop to leaves and leaves...

Byun, J.-Kyun; Chang, K.-Ho, 1995: Effect of leaf and fruit application of dichlorprop on preharvest drop, ripening and ethylene forming systems in 'Tsugaru' apple fruits. To investigate the position effects of dichlorprop application on the preharvest drop, ripening, and ethylene forming system in 'Tsugaru' apple fruits, 45.0 mg cntdot liter-1 of dichlorprop was applied on the leaf, fruit, or leaf + fruit...

Byun JaeKyun; Chang KyungHo, 1995: Effects of spray time, concentration and volume of dichlorprop on preharvest drop and ripening in 'Tsugaru' apple fruits. The effect of dichlorprop (5 or 10 litres/tree, applied at a concentration of 22.5 or 45.0 mg/litre on 14 or 22 July or on 30 July) on preharvest drop and ripening of apples was investigated. Dichlorprop treatment decreased preharvest drop, the 45...

Kondo, S.; Takahashi, Y., 1988: The effects of 2,4-DP, MCPB and daminozide on preharvest drop and fruit quality of Tsugaru and Starking Delicious apples. Preharvest drop was reduced following application of 2,4-DP (2,4-dichlorophenoxypropionic acid [dichlorprop]) at 45 p.p.m., MCPB at 30 p.p.m. or daminozide at 400 p.p.m. Fruit firmness was increased by daminozide; 2,4-DP and 30 p.p.m. MCPB had no...

Kyun, J.-Kyun; Chang, K.-Ho, 1995: Effect of spray time, concentration and volume of dichlorprop and preharvest drop and ripening in 'Tsugaru' apple fruits. This research was carried out to investigate the effect of different spray time, concentration, and volume of dichlorprop on preharvest drop and ripening in 'Tsugaru' apple fruits. Preharvest drop was decreased at the concentration of 45...

Tsukahara, K.; Koike, H.; Miyagawa, K., 1983: Studies on preharvest drop in apples. I. Effects of 2,4-dichlorophenoxypropionic acid triethanolamine salt sprays on preharvest drop in Tsugaru, Starking and Jonathan apples. Trees were sprayed with 15, 30 or 45 p.p.m. 2,4-dichlorophenoxypropionic acid triethanolamine salt (2,4-DP) [dichlorprop] 25, 20, 15 or 10 days before harvest. In cultivars Tsugaru and Starking, spraying with 45 p.p.m. 2,4-DP effectively reduced p...

Marini R.P.; Byers R.E.; Sowers D.; Marini M.E.; Young R.W., 1988: Fruit abscission fruit quality and residue levels of dichlorprop used to control preharvest drop of apple. Five apple (Malus domestica) cultivars were treated with NAA at 10 mg .cntdot. liter-1 and dichloroprop at 5, 10, and 15 mg .cntdot. liter-1 during 2 years. Although the response varied with cultivar, NAA generally delayed fruit abscission compare...

Tsukahara K.; Koike H.; Takahashi E.; Hirata N., 1990: Effects of dichlorprop and mcpb on preventing preharvest drop of apples. The influence of 2,4-dichlorophenoxy propionic acid triethanolamine salt (dichlorprop) and 2-methyl 4-chlorophenoxy butyric acid ethylester (MCPB) sprays on preventing preharvest drop of apples was examined. The effects of concentration, number of...