Well, so far so good. The preventative spray whose lack of efficacy caused the infestation has been dropped from the program and, apart from a number of flag shoots (sources of powdery mildew) on the Chardonnay, all is good. The unintended consequence has been that a pest that has affected the Riesling and Chardonnay in the lower vineyard has been eliminated. Blister (erinose) mite was introduced when I bought some Riesling rootlings to extend the plantings. That was in 1990 I think and we have been battling every since. So far there has been so signs of this pest.