Abstract
Lettuce (Lactuca sativa L.) is one of the most important vegetables in Brazil and in the world, in 2017 it was the 18th most marketed commodity at Ceagesp. Among the phytosanitary threats that can occur on lettuce, the Mildew stands out, having the fungus Bremia lactucae as its causal agent that can cause great damages to the producers mainly in winter times, where the environmental condi…