If you aren’t getting adequate biological control of vine mealybug in an organic vineyard the most common reason is that ants are interfering with the parasites’ activity.

I do believe what growers use in their fields impact beneficials, the largest is Sulfur and other PM materials. For some reason those products are not on impact list? I still do not know how to shy away from these products?

I have and am still involved with several organic vineyards, all of those sites have full time flower and beneficial cover crops. They are infected with M.B at levels that make the fruit unmarketable, except for the fact that they winery owned and all the fruit is harvested. There is parasitization is high but the level does not impact the population enough and it continues to grow. All products used do impact beneficials except Sulfur so why the high populations?

I have a belief you might be lucky so what gives?