Abstract
Hemmi and Lehman and Wolf were the first researchers to describe soybean anthracnose in Asia and the New World. The causal fungus was named Colletotricbum glycines, which later was found synonymous to C. dematium. Athow and Tiffany considered soybean anthracnose a minor disease. Outside the temperate soybean zone, anthracnose causes important soybean losses. Soybean production has increased under tropical and sub-tropical climates. C. dematium depends on a film of water to penetrate soybeans. With free water, conidia of C. dematium germinate within 4 to 16 h at 20 to 30 C. Mycelial growth is sustained when relative humidities exceed 83%. Soybean anthracnose fungi are widely distributed and have been reported from most areas where soybeans are cultivated. The prevalence and severity of these fungi, however, appears to be greatly increased in humid tropical and sub-tropical environments. Direct assays of latent populations of pathogenic fungi may be useful in forecasting disease outbreaks.
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