Interval between spraying Daconil and Blossom End Rot Spray
I have been gardening for 30+ years and this is my worst year ever. I got back from Afghanistan in late April and got everything planted late. My plants were thriving in May (cool evenings and good rain) by june the high heat and lack of rain set in. For July we went into drought mode for 10-14 day periods followed by 2-3 days of torrential downpours. So you already know the blossom end rot kicked in and the humid nights which followed caused some form of fungal problem, most likely a blight.
I spray my tomatoes with a blossom end rot preventer after each heavy period of rain not to exceed 2x per month. Tonight I sprayed a generic Daconil (Clorathalonil) as a multi disease treatment. 2 questions:
1. what is the recommended interval I should wait befor spraying blossom end rot spray again?
2. what is the preharvest interval for daconil?
If it matters to the reader, my varieties are:
Opalka (on the verge of dying)
Roma VF (holding their own)
Big Boy (early stages of blight)
Celebrity (holding their own too)
Look forward to some great replies; thanks for your time