Q.We have a couple of tomato plants which were recently transplanted. They were doing well for about 2 weeks, then the leaves are
withering and both dying. We have watered them regularly. The pH of the soil is about 6.5. What are the likely causes please? The plants are in a shady area.

Certified GKH Gardening Expert
Were they previously in a sunny area? Vegetable plants need lots of sun. The combination of shade and water probably brought on a fungal wilt disease like Verticillium wilt fungus or Fusarium wilt fungus. Here is more information:
https://www.gardeningknowhow.com/edible/vegetables/tomato/wilting-tomato-plants.htm