Question
I planted a tomato plant for the first time. Soil is well-drained and sandy, dark with humus. Temperature is about 30-35 Celsius. It was doing great initially but recently its growth is stunted, inclusive of the fruits. The leaves curls upward and there are slight patchy yellowing. What is going on and how can I save the plant?  

Answer
Hi Tan;
I am going to try to get a tomato crop, again this year.
I haven't had much luck in the past few years.
I found this page on tomato problems.
I think this can answer your problem better than I can.
Lots of tomato info in here. I am bookmarking this page for myself too.
Charlotte

http://www.ext.colostate.edu/pubs/garden/02949.html