Disease control in Alliums (bulb onion)
Depending upon the season and growing situation onion downy mildew (Peronospora destructor) can be a devastating disease. In bad seasons resulting in significant crop losses. To mitigate the risk, growers generally carry out a programme of treatments during the season to prevent onion downy mildew getting a hold in the crop. Preventative treatment is much more effective than trying to eradicate an established infection.
For the best activity against onion downy mildew an application of ORONDIS® Plus with AMISTAR® should be made as a preventative treatment not as a curative application. Trials in onions have also shown that the addition of an adjuvant such as Activator 90 improves control of onion downy mildew
Independent trials show ORONDIS® Plus + AMISTAR® effectively control onion downy mildew under high disease pressure
Main messages
- ORONDIS® Plus contains Oxathiapiprolin which is highly active at low dose rates.
- ORONDIS® Plus should always be used in combination with AMISTAR® to minimise the risk of fungicide resistance developing to Oxathiapiprolin.
- ORONDIS® Plus with AMISTAR® works best as a protectant and should be used before disease becomes established.
- ORONDIS® Plus with AMISTAR® should be incorporated into a programme of treatments to protect onions from onion downy mildew through the season.
Availability to the market
- To maintain the effectiveness of Oxathiapiprolin (ORONDIS® Plus) as a first-class material for control of downy mildew, the active substance should always be used in combination with an effective partner.
- ORONDIS® Plus from Syngenta is available as a co-pack with AMISTAR® to ensure that growers have the correct amount of both materials for optimum disease control.
Onion downy mildew – recent trials experience
Independent trials data has demonstrated the superior efficacy of ORONDIS®. Independent assessments have confirmed dependable, high-performance downy mildew control essential for premium crop production and high yields.
Onion downy mildew % incidence, Suffolk
Weekly applications of Oxathiapiprolin + Metalaxyl-M alternating with Mancozeb showed:
- Better disease control than standard treatments
- Reliable, season-long protection
- Improved crop quality and yields
- Robust performance under high disease pressure
This demonstrates dependable, high-performance downy mildew control essential for premium crop production and high yields.
*Zorvec Endavia is a trademark of Corteva Agriscience
Previous trials have shown that ORONDIS® Plus with AMISTAR® provides optimum efficacy when used with an adjuvant such as Activator 90. Pictures below illustrate the level of control seen in the trial.
Related products
Fungicide
ORONDIS PLUS
OD (Oil dispersion)
- 100 g/l oxathiapiprolin
Fungicide
AMISTAR
SC (Suspension Concentrate)
- 250 g/l azoxystrobin