Optimal concentration of active ingredient in a bioformulation for the control of Diplodia seriata in two grapevine (Vitis vinifera) cultivars

Abstract: A bioformulation containing a mixture of Trichoderma harzianum and Clonostachys rosea as the active ingredient, decreased in 54 % the lesion length produced by Diplodia seriata in Cabernet Sauvignon, using 1 × 105 and 1 × 106 conidia/ml; while a 75.81 % decrease was observed in Chardonnay with 1 × 106conidia/ml. Hence, the development and evaluation of a bioformulation should consider, not only the optimal volume/concentration and area where it is going to be applied, but also the response of each grapevine cv. or genotype to the BCAs included in the bioformulation.