Three different forms of rust of wheat and their causal organisms are
Black or stem rust - Puccinia graminis tritici
Brown or orange rust - Puccinia recondita
Yellow or strip rust - Puccinia striiformes Black and brown rust are practically found all over the world, while yellow is restricted. Aspergillus causes rot of figs and dates, decay of tobacco and cigars.
Rhizopus causes soft rot of vegetable and transit disease called leak.