weather and tomato plants

It appears that tomato plants flourish when temperature are fairly low. During the first few weeks of 2016, the temperatures in panaji, goa were less than 25 deg C and the tomato plants were blooming, with many yellow flowers.
Now the weather has changed in panaji, goa and the temperatures have increased. No new flowers have been observed on the tomato plant in the last week.
However there is a white fungus/mold like growth on the tomato plant