This is an older thread, but you do NOT want to use neem oil when in flowering. First I have found it to be terribly ineffective and second, you can taste the oil on the bud even when used in the first 3 weeks....nasty, nasty and that stuff never seems to go away. Later in flower, you have fewer options. Lower temps help, higher humidity (if it doesn't cause bud rot problems), and spraying with water or a wash as suggested.