Extending tomato height

'botrytis blight' appears to be an American term for botrytis. when i did a search. In UK, blight is generally known as the dreaded lurgy, a disease affecting the Solanaceae family, mainly potatoes and outdoor tomatoes while botrytis, grey mould, affects many more plants especially under glass.

I find on tomatoes that it spreads on any even slightly damaged leaves showing some browning. I've also noticed, from now on in the year, it can start where the dead petals of a flower drop on a healthy leaf. This can cause a damp spot now and give the fungus a way in.