When it comes to selecting a sterol inhibitor (FRAC Group 3) fungicide for your powdery mildew control program this year, the choice of formulation can make a big difference in performance and profits.
Consider the tebuconazole class of sterol demethylation inhibitor (DMI) foliar fungicide products. In a series of field trials conducted in California grape vineyards from 2006 to 2008, an aqueous suspension of tebuconazole — Orius® 20 AQ — controlled powdery mildew on both fruit and leaves better when compared to tebuconazole 45 DF and a treatment of Elite WP.
For example, in one study involving an average of five trials, researchers found no more than about a 10 percent incidence of powdery mildew on the fruit in vineyard plots treated with Orius 20 AQ. That’s considerably better than the 15 percent incidence rate with a wettable powder form of tebuconazole, and much better than the 26 percent incidence of the disease in plots treated with a dry flowable form of tebucanazole. At the same time, the incidence of powdery mildew in untreated check plots exceeded 60 percent.
Orius 20 AQ controlled powdery mildew on leaves better than the wettable powder or dry flowable product treatments.
The easy-to-measure liquid formulation of Orius 20 AQ features a unique solvent system. Developed by MANA Crop Protection, the Orius 20 AQ formulation allows better penetration of the fungicide into the leaf cuticle. This helps explain the increased effectiveness of the product in controlling powdery mildew compared to dry formulations, says John Descary, MANA Crop Protection Business Leader, based in Bakersfield, Calif.
The product, which is absorbed through the leaves and fruit blossoms, provides economical, two-way protection from powdery mildew in grapes. “The chemistry of Orius 20 AQ is effective in both curing and preventing existing disease, while providing exceptional crop safety,” he says. “And, you can rotate it with a strobilurin material or boscalid-containing product as part of a complete mildew control program to manage disease and fungicide resistance.”
What’s more, the product offers better value than some other higher-priced fungicides in the same class of chemistry.
“Orius 20 AQ gives you the most performance for your money,” Descary says. “The cost per acre for this class of chemistry has come down drastically in recent years. Many companies have brought similar chemistries to the market, but MANA Crop Protection has taken the time and invested the dollars to improve upon an already excellent fungicide. We simply made tebuconazole better with Orius 20 AQ.”
The highly-soluble liquid makes for easier mixing in the tank than dry fungicide products. Also, unlike some other products in its class which contain a Warning signal word, the Orius 20 AQ label contains the less restrictive Caution signal word concerning its use.
Orius 20 AQ is available in packages of four 1-gallon containers or two 2.5 gallon containers.