Environment
Asian Soybean Rust (ASR) was first detected in Asia. It has been found in many countries around the world since then. For example, Australia, China, Korea, India, Japan, Nepal, Taiwan, Thailand, the Philippines, Mozambique, Nigeria, Rwanda, Uganda, Zimbabwe, South Africa, Brazil, Argentina, and Paraguay. This disease was first detected in the United States in Puerto Rico in 1976 and firstly reported in the continental United States in 2004.
Asian Soybean Rust favors the environments that are humid and warm. Continuous period of wetness on leaves will help the growth of this disease since this situation is required for spores to germinate. Therefore, is most likely to appear under the condition which the temperature is between 60 and 85 degree Fahrenheit and relative humidity of 75% to 80%. Therefore, ASR is a more serious problem in tropical and subtropical areas in Asia, Africa, Australia and South America.
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