WLP740 Merlot Red Wine Yeast

Neutral, low fusel alcohol production. Will ferment to dryness, alcohol tolerance to 18%. Vigorous fermenter. WLP740 is well suited for Merlot, Shiraz, Pinot Noir, Chardonnay, Cabernet, Sauvignon Blanc, and Semillon.

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Rondo Grape/Merlo yeast /Malo-lactic - best ever result

By: David Thursfield | Date: Oct., 1st 2015 | Beer(s) Brewed: Rondo Black Grape variety

I used your test tube liquid Merlot wine yeast for 250 litres of 2015 home produced Rondo grape juice. The grapes were de-stalked and fermented on crushed pulp for 21 days. This was followed by a secondary fermentation using your Malo-lactic product. This is my 7th year of production. I have previously used dried yeast and no Malo-lactic. I have never been able to sensibly serve my full bodied red until matured for more than 3 years. My 2015 wine, now 12 months old is a different product. It is softer, very rich and drinks better, already, than anything I have previously produced, even my 'owners reserve' 5 year old.

Frequently Asked Questions




Optimum Ferment Temp.60-90°F (16-32°C)

Alcohol ToleranceVery High

MiniFerment Data ?

As-is DiacetylNA

Total DiacetylNA

As-is 2,3-Pentanedione4.75ppb

Total 2,3-PentanedioneNA



Ethyl Acetate31.53ppm

Isoamyl Acetate1.55ppm


Isoamyl Alcohol161.87ppm


Fermentation temperature: 55° F Attenuation: 83% Hours to get to 50 percent attenuation: 100