G’day Possum.
There are a few ways to slow the effect of the blight from killing your tommies.
Firstly, buy disease resistant plants which you know will grow in your area.
I use Big Beef or Oxheart. I live Nth NSW. Something else may be ideal for you.
Secondly, give them lots of room. At least a square metre of space. A bit more is better.
I’ve found if you cover them from rain, so they never get wet, you’ll increase your chances.
SO make a frame over the plant and put sheet plastic or something over it. Only water the plant at soil level. Keep the leaves dry.
Mulching stops spores from splashing up onto the lower leaves. SO keep it thick, or use a sheet
of matting as a mulch. Shadecloth might do it. I have a sheet of black plastic on the ground around a plant at the moment and it is working well. No blight and the plant is producing fruit.
Prune off the lower leaves, don’t allow any part to touch the soil.
Also, stagger your plantings. Once a plant becomes infected, don’t allow it to produce any more fruit. Just use what is already on it and the next plant will be your next supply.
Excellent drainage is a necessity. Good air circulation also.
The plants need to be thriving and growing quickly. No time for a struggle. Get growing, make fruit, go to the compost bin as quickly as possible. So prepare your soil really well.
SOunds like a lot of extra work but it aint. Just plan well.