papaya

ohmypapaya starts with ...
my papaya is getting yellow leaves and the heart is going brown. The baby fruit on it, some are still green so ok but some have also turned yellow. I lost one last week as the leaves went curled the heart died off completely. so cut it out. i was thinking whitefly and now it has gone to this other plant as they are beside each other. i have bought some spray for whitefly. it gets plenty of water, not too cold here right now, soil good. any comments welcome, thanks