what night time temps will shut off tomato blossoming?

[dixiegrrrrl]

2. Maybe this will help....I googled for you.

Blossom drop will occur in the spring if daytime temperatures are warm but night temps drop below 55 degrees F. (13 C.). In the summer when temperatures soar over 90 degrees F. (32 C.) with nights over 76 degrees F. (24 C.), again, the tomato plant will suffer damage to immature fruit or loss of flowers.

Additionally, when nights become too warm, the pollen grains of the tomato flower begin to burst, thwarting pollination, hence no fruit set. This is doubly true when the air is saturated with relative humidity.


The growing temp for tomato seedlings should be maintained at constant temps of between 58-60 degrees F. (14-16 C.), whether starting in the greenhouse or indoors, and then not transplanted until the last frost has passed.

down here in SW Alal we have opposite problem.....no tomatoes when temps get above 70 at night and 80 daytime.
So I cut all my plants back to a few inches of stalk, they grown again during hot weather and set again in fall.