Articles
DECREASING SHOOT LENGTH IN ‘FUJI SUPREMA’ APPLE TREES WITH TRINEXAPAC-ETHYL IN SOUTHERN BRAZIL
Article number
1042_38
Pages
319 – 324
Language
English
Abstract
The gibberellin biosynthesis inhibitor trinexapac-ethyl (Tri-E) can be an alternative to control the excessive growth of temperate fruit trees in Brazil.
Tri-E was tested in Fuji Suprema for its effects on shoot growth and fruit quality in two seasons in the city of Muitos Capões, RS state, Southern Brazil (28°2716S, 51°0758W, alt. 882 m). The trial was conducted in a randomized block design with four replications of the following treatments: Tri-E (Moddus® 250 SC) at 200, 250, 400 and 500 mg/L, Prohexadione-calcium (Pro-Ca, Viviful®) at 125 mg/L and Paclobutrazol (PBZ, Cultar® 250 SC) at 125 mg/L, and an untreated control.
Shoot length was reduced more than 50% by all doses of Tri-E and Pro-Ca in 2011/2012, whereas shoot length was reduced 36% by PBZ compared with control.
However, in 2012/2013 shoot length was reduced approx. 20% for almost all doses of Tri-E and Pro-Ca in the first year.
No differences in yield were observed between treatments and the control.
A reduction in productivity of plants sprayed with Tri-E compared to the control was observed in 2012/2013. However, doses of 200, 250 and 400 mg/L Tri-E increased fruit set by more than 60% compared to the control.
The results indicate that reduced shoot growth of trees treated with Tri-E can provide growers with an important tool to reduce pruning costs, however, the use must be considered because there was a decrease in productivity.
Doses of 200 and 250 mg/L Tri-E reduced the vegetative growth of Fuji Suprema, resulting in firmer fruit and higher soluble solids, with no residual effect on post-harvest fruit quality.
Tri-E was tested in Fuji Suprema for its effects on shoot growth and fruit quality in two seasons in the city of Muitos Capões, RS state, Southern Brazil (28°2716S, 51°0758W, alt. 882 m). The trial was conducted in a randomized block design with four replications of the following treatments: Tri-E (Moddus® 250 SC) at 200, 250, 400 and 500 mg/L, Prohexadione-calcium (Pro-Ca, Viviful®) at 125 mg/L and Paclobutrazol (PBZ, Cultar® 250 SC) at 125 mg/L, and an untreated control.
Shoot length was reduced more than 50% by all doses of Tri-E and Pro-Ca in 2011/2012, whereas shoot length was reduced 36% by PBZ compared with control.
However, in 2012/2013 shoot length was reduced approx. 20% for almost all doses of Tri-E and Pro-Ca in the first year.
No differences in yield were observed between treatments and the control.
A reduction in productivity of plants sprayed with Tri-E compared to the control was observed in 2012/2013. However, doses of 200, 250 and 400 mg/L Tri-E increased fruit set by more than 60% compared to the control.
The results indicate that reduced shoot growth of trees treated with Tri-E can provide growers with an important tool to reduce pruning costs, however, the use must be considered because there was a decrease in productivity.
Doses of 200 and 250 mg/L Tri-E reduced the vegetative growth of Fuji Suprema, resulting in firmer fruit and higher soluble solids, with no residual effect on post-harvest fruit quality.
Authors
G. de A. Meyer, M.E. Bueno, A.R. Luz, A.A. Kretzschmar, L. Rufato, A. De R. Rufato
Keywords
Malus domestica, gibberellin biosynthesis inhibitor, vigor, acylcyclohexanediones, fruit quality
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