Articles
Sequential application of budbreak promoters in ‘Baigent’ apple trees under anti-hail net in southern Brazil: Erger® and mineral oil usage
Article number
1268_40
Pages
299 – 306
Language
English
Abstract
A single application of hydrogen cyanamide (HC) or Erger® with other compounds has shown unsatisfactory results for budbreak induction of LSQUOBaigentRSQUO apple trees in some years in southern Brazil, especially under anti-hail nets.
Then, this work aimed to evaluate Erger® with mineral oil (MO) as a sequential application (second spraying) to induce budbreak under these conditions.
The study was performed during the 2017/18 and 2018/19 growing seasons in a commercial orchard with black net, Vacaria, RS, Brazil.
A RCB design was adopted in a factorial structure with seven levels of budbreak promoter: 1. Control (no application); 2. 1.5% Erger® + 3.5% MO; 3. 1.5% Erger® + 3.5% MO (Application 1 – AP1) and (Application 2 – AP2); 4. 3% Erger® + 3% Calcinit®; 5. 3% Erger® + 3% Calcinit® (AP1) and 1.5% Erger® + 3.5% MO (AP2); 6. 0.34% HC + 3.5% MO; 7. 0.34% HC + 3.5% MO (AP1) and 1.5% Erger® + 3.5% MO (AP2) and two levels of canopy portion: 1. Lower and 2. Upper part.
Axillary and terminal budbreak, fructification, and proportion of the total weight of fruits tree-1 harvested during commercial maturity were assessed.
Axillary budbreak was increased by 1.5% Erger® + 3.5% MO as a sequential application after 1.5% Erger® + 3.5% MO and after 3% Erger® + 3% Calcinit®, compared to the respective single treatments.
There were no differences between both portions of the canopy.
The effect of the sequential treatments on fruiting was probably masked.
The highest number of fruits tree-1 was provided by the upper canopy.
Overall, two applications of 1.5% Erger® + 3.5% MO are an alternative to its single treatment and 3% Erger® + 3% Calcinit® in the budbreak induction of LSQUOBaigentRSQUO apple trees under anti-hail net in these conditions of southern Brazil.
Then, this work aimed to evaluate Erger® with mineral oil (MO) as a sequential application (second spraying) to induce budbreak under these conditions.
The study was performed during the 2017/18 and 2018/19 growing seasons in a commercial orchard with black net, Vacaria, RS, Brazil.
A RCB design was adopted in a factorial structure with seven levels of budbreak promoter: 1. Control (no application); 2. 1.5% Erger® + 3.5% MO; 3. 1.5% Erger® + 3.5% MO (Application 1 – AP1) and (Application 2 – AP2); 4. 3% Erger® + 3% Calcinit®; 5. 3% Erger® + 3% Calcinit® (AP1) and 1.5% Erger® + 3.5% MO (AP2); 6. 0.34% HC + 3.5% MO; 7. 0.34% HC + 3.5% MO (AP1) and 1.5% Erger® + 3.5% MO (AP2) and two levels of canopy portion: 1. Lower and 2. Upper part.
Axillary and terminal budbreak, fructification, and proportion of the total weight of fruits tree-1 harvested during commercial maturity were assessed.
Axillary budbreak was increased by 1.5% Erger® + 3.5% MO as a sequential application after 1.5% Erger® + 3.5% MO and after 3% Erger® + 3% Calcinit®, compared to the respective single treatments.
There were no differences between both portions of the canopy.
The effect of the sequential treatments on fruiting was probably masked.
The highest number of fruits tree-1 was provided by the upper canopy.
Overall, two applications of 1.5% Erger® + 3.5% MO are an alternative to its single treatment and 3% Erger® + 3% Calcinit® in the budbreak induction of LSQUOBaigentRSQUO apple trees under anti-hail net in these conditions of southern Brazil.
Authors
L.S. Paim, F.J. Hawerroth, G.A.B. Marodin, D.S. Mauta, F. Simões
Keywords
Malus domestica Borkh., mild winter chilling, endodormancy overcoming, budbreak induction, protected cropping
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