Improving fruit set in the south

[Gardeneer]

Originally Posted by Lasairfion

I'm not sure why, but Youtube threw up a video suggestion for me last night about tomatoes. I don't think I've ever heard of people spraying apple juice on their tomato blossoms before. I wonder if it works?

Using Apple Juice to Set Blossoms Note according to the video comments he means 'Ethylene' when he says 'Methane'

Tomato flowers are pretty much self pollinating. The male and female parts are in a very close proximity.
The idea of spraying with apple juice ( or anything sweet )is to attract pollinators like bees. But Pollinator visit is not a guarantee for fruits set at high temp/humidity.
When the air is too hot and humid the pollen just won't do the job. And maybe the ovules wont take it.

Another point as Big V mentioned could be high soil temperatures. It is established that potatoes won't set tubers when the soil temperatures approach 80F. i am thinking that tomato, being a close relative of potato might not like hot soil too.