Please suggest what could be wrong;
Some of my tomatoes, egg plant, rocket grow well for a couple of weeks. Then we notice a leaf wilting, and within two to three days the plant is completely wilted. This does not effect all the plants, nor does this happen simultaneously.
This problem does not effect my chillies, green pepper, carrots and bush beans.
We are not over watering the plants. We do not water late afternoon.
I do not notice any markings e.g "rust" on the leaves etc.
We suspect there may be a latent fungi in the soil. The garden is in an area that was previously a sugar cane farm, 20 years ago.