I found late blight on the tomato plants on Labor Day weekend. I sprayed them often with vermicompost tea and I think it did slow the blight spread. Hardly any of the tomatoes were getting infected. I had one plant with several huge tomatoes that were slowly becoming vine ripened to perfection. Yesterday, the chickens got into the garden - I had accidentally left the gate open. Well let me tell you, chickens KNOW which tomatoes are the ripest and juiciest.