Among cereal crops wheat is a major food and important commodity of the world grain market.In India it is second important food crop.Since air pollution is a relatively new factor in agriculture, its impact including on diseases caused by various biotic pathogens needs to be thoroughly examined. This book is a step to find out relationship between two groups of pathogens: Anguina tritici (biotic) and air pollutants i.e. SO2, acid rain, fly ash (abiotic) on a common host (wheat). The host-parasite relationships of both pathogens were different. The expected impacts of both pathogens separately...