I have mentioned this before but thought I would write about it again. I'm sure you know but if you don't, did you realise you can cultivate new tomato plants from the inter nodal removals?
If you grow cordon tomatoes, the little shoots that appear between the leaves and stems, have to be constantly removed. I have just done mine and amongst the various lengths, were two that are about 4" long.
These were potted on into individual pots, almost up to their leaves, watered and put into a light shady place:
These inter-nodal cuttings are full of hormones so quickly root. You must take them from healthy plants. I try to take them between 3" and 4" long for best results but ones up to 6" have also taken well.
The advantage of doing this is that it extends your season. I sometimes have to bring them indoors to ripen the fruit (the cutting are always put into pots for this reason, rather than the ground), as they are later to flower and fruit.
Last year, I trialled spraying my tomatoes with 1/2 a disprin in 1 pint of water to try and keep blight at bay. It seemed to work although it wasn't a big blight year around here. I am doing so again due to the amount of rain we have had. Time will tell it it helps.