I would not be so categorical, both for the heat and the sunshine. In my opinion beyond 35 ° the stomata of the tomato plants are closed and the photosynthesis is disturbed. In my case I am afraid that several factors have come into synergy negative: sudden jump in temperatures upwards, sudden and prolonged sunshine, lack of water, no sufficient drop in temperature at night ...Did67 wrote:Excess heat, outside, the tomato does not know: my tomatoes in my greenhouse (not the open tunnel) have cooked up! I harvested tomatoes, mature, but cooked on the outside!
And the aggressive sun, on the tomato: never at home. She grows in Lanzarote !!!
If I compare the climates of Lanzarote and Bordeaux, I find that the summer months are sunny towards my home!
Finally there may be burns on tomato fruits:
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Les températures excessives, liées à une forte in-solation directe, favorisent l’apparition du
blotchy ripening – taches jaunes sur fruits – ainsi que du« collet jaune » chez les variétés à fruits à collet vert. Elles peuvent également entraîner des brûlures plus sévères sur les fruits.
https://fr.scribd.com/document/61256418/FT-tomate