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.
