By John Descary, Business Leader, MANA Crop Protection
Powdery mildew is the most pervasive foe that grape growers face each year. If not managed within a systematic season-long strategy, this disease can reduce the health and economic viability of any vineyard. Left untreated, it can also promote increased levels of other fruit rots like Botrytis bunch rot and sour rot.
Powdery mildew can strike at any time during the season. However, most growers know that season-long control depends upon reducing early-season inoculum and subsequent infection. Once powdery mildew is discovered, growers need to act quickly with treatment and repeat at appropriate intervals.
That’s why the most important thing you can do in controlling powdery mildew is to not get behind. Since powdery mildew is nearly impossible to see before a full-blown infection occurs, a preventative spray program helps stop outbreaks before they start. Eradicating an existing powdery mildew infection is much more costly and time-consuming than preventing it.
With a wide range of fungicides available for powdery mildew, the question becomes which tool to adopt and at what interval? Grapes are most susceptible to the disease during the period from just before flowering to four to five weeks after fruit set. Failure to implement control during this period can result in serious crop damage. Frequency of treatment thereafter is determined by rainfall, temperature and fungicide program protocol. Guidelines regarding spray intervals are best defined when growers follow the University of California-Davis Powdery Mildew Index.
Managing powdery mildew also comes down to making choices that allow fungicide options to perform at their highest potential regarding efficacy, resistance management, residual activity and application flexibility. The ability to balance these often-competing demands is why many growers rely on Orius® 20 AQ fungicide.
Orius 20 AQ provides superior broad-spectrum control against powdery mildew and many other diseases. And with absorption through the leaves and fruit blossoms, it has the advantage in delivering both curative and preventative disease protection.
Orius 20 AQ features the less restrictive “Caution” signal word and as a sterol demethylation inhibitor (DMI) class FRAC 3 fungicide group, it can be rotated with strobilurin and boscalid chemistries to manage fungicide resistance.
In preparation for 2012, make sure your input choices secure success for not only abundant grape production but superior disease management. And whether you produce wine, table or raisin grapes, Orius 20 AQ can help increase tonnage while maintaining crop quality, which are top of mind production priorities for every grower - every year.
To learn more about Orius 20 AQ, go to the MANA Crop Protection website at www.manainc.com or call 866-406-6262.
MANA Crop Protection, 3120 Highwoods Blvd. #100, Raleigh, NC 27604. Always read and follow label instructions. Orius® is a registered trademark of a Makhteshim Agan Group Company.