I'm always changing up my program based on weather and different products. This year I'm going to do a split app of pre this fall based on rocommendations from a local golf super and a turf professor I am going to do a slit app of simazine in October followed up by atrazine in December. So my question is hot hot is too hot for an application of simazine? My fall is going to be busy with fall seeding the end of September and our first born expect the end of October. I'm trying to get ahead while I can. All I can find on the label is to apply after sept 1 In a perfect world the temps will cool off and I will be done seeding this month and can start pre apps oct 1.