Longan fruit , have no flowers this year Whats is the reason ?

[Sandman77]

Hello in farm of my wife this year our. Longan fruits all trees did not have any fruits cos no flower coming , this happen last time 6 year ago

This year the heat comming much more early last year was to cold at this time , is this reason that no flower comming or the use of chemical , or maybe some insects ?

 

 

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[cooked]

Like many other fruit trees, a good fruit bearing year may be followed by a bad (or two). In addition, although they don't need frost, they need low winter temperatures in order to flower.

Some apple trees tend to bear fruit irregularly also and I seem to remember that there was some kind of spray proposed. (Gibberelin?)

I think insects can be ruled out.