| Autor: |
Rolando CA; Scion, Fenton Park, Rotorua, New Zealand., Gaskin RE; Plant Protection Chemistry, Rotorua, New Zealand., Gous SF; HeliResources, Rotorua, 3040, New Zealand., Horgan DB; Plant Protection Chemistry, Rotorua, New Zealand., Raymond LG; Scion, Fenton Park, Rotorua, New Zealand. |
| Jazyk: |
angličtina |
| Zdroj: |
Plant disease [Plant Dis] 2017 Sep; Vol. 101 (9), pp. 1652-1658. Date of Electronic Publication: 2017 Jul 07. |
| DOI: |
10.1094/PDIS-04-17-0553-RE |
| Abstrakt: |
The aim of this investigation was to determine the effect of dose and adjuvant on uptake of two phosphite products (Phos-A and Phos-B) into Pinus radiata needles. In experiment 1, uptake of 6 kg ha -1 phosphite, applied as Phos-A, in 100 liters of water, together with an organosilicone superspreader (0.2%), was high (>60%). Uptake at doses greater than 6 kg ha -1 (12, 15, 18, and 24 kg ha -1 ) and applied in volumes less than 100 liters of water (75 and 50 liters) was poor (1 to 30%). Using stability tests and NMR spectroscopy in experiment 2, this appeared to be linked to a concentration dependent reaction resulting in the degradation of the organosilicone adjuvant that facilitated uptake of Phos-A. In experiment 3, uptake of phosphite applied as Phos-B, between 6 and 24 kg ha -1 in 100 liters of water, was tested alone and with four adjuvants (an organosilicone, alcohol ethoxylate, lecithin, and esterified seed oil). Uptake of Phos-B without any adjuvant was high (>50%) across all doses, indicating the formulation was optimized for P. radiata needles. Uptake of Phos-B increased with concentration up to 72% at 24 kg ha -1 in 100 liters of water. Symptoms of phytotoxicity were observed at rates of ≥12 kg ha -1 . This study highlighted the effect of formulation, dose, concentration, and adjuvant on the uptake of phosphite into P. radiata needles. |
| Databáze: |
MEDLINE |
| Externí odkaz: |
|
