This has been progressive over the last 6 weeks, leaves turning dry, brown and getting very thin and shriveling like paper on a Tomato "Blue Berries" cherry tomato plant.
The closest I could guess was it was a fungus/disease of some sort after reading this article: https://dengarden.com/gardening/Yellow-leaves-on-tomato-plants-Get-rid-of-yellow-tomato-leaves
Tomato plant leaves do not begin by turning brown unless it's a fungal attack such as Septoria leaf spot or other fungal infections...
I bought a fungicide and have applied it once 10 days ago but as you can see still deteriorating, we've had 3 days of rain and I'm due to spray it again; am I on the right track? I'm really quite puzzled.
The plant receives a fortnightly dose of diluted Kelp Fertiliser and Liquid Potash.
It is now Spring here in Australia. If you need any more pics let me know. Thank you!
And these shots from October 1:
Thanks fellow gardeners