Environment
Crown Rot of wheat caused by Fusarium is a widespread disease. It was previous believed that Crown Rot is restricted in its geographical distribution. In the United States, the disease is most prevalent in the driest and warmest regions of the Pacific Northwest. However, recent investigations have suggested that the disease is found is most cereal producing regions of the world.
Local environmental conditions play a large role in the prevalence of F. pseudograminearm. This is particularly evident during late season when the crops are maturing. While both rainfall and temperature are important, studies have shown that rainfall plays a much larger role in the prevalence and severity of Crown Rot; although a weak temperature-disease correlation does exist. In the field survey of wheat crops in Australia, the maximum summer temperature in areas where P. seudograminerum was found to be as high as 31ºC. Under drought conditions, where warm and dry weather predominates, Crown Rot symptoms are intensified. This is largely due to the pathogen's ability to survive and thrive under these conditions. Laboratory studies suggest that P. seudograminerum grows best under dry (<-1Mpa) conditions. They further showed that while the pathogen grew fairly well in temperatures ranging from 5ºC to 30ºC, it does not grow well at 5ºC or 35º.
Read more about this topic: Fusarium Pseudograminearum
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