Biological Characteristics of Cotton Boll Rot Disease Pathogen

Cotton Science 2005，17(2)：84-87

Biological Characteristics of Cotton Boll Rot Disease Pathogen
LU Ning-hai¹，XU Rui-fu¹，WU Li-min¹，TIAN Xue-liang¹，QI Shang-hong²
(1.Department of Plant Protection， Henan Institute of Science and Technology，Xinxiang，Henan 453003, China；2.Department of Agriculture, Huixian, Henan 453600,China) 

Abstract: The biological characteristics of cotton boll rot disease pathogen were tested in Henan in 2003 and 2004.The results showed that the optimal medium for the growth of parthogn was PSA，the optimal temperature was 20-25℃，the optimal pH value was 7.0-9.0.The ultraviolet rays inhabited the mycelium growth but the light didn't. The fungi grew best in sucrose and maltose as the carbon source. Among nitrogen sources，NH₄Cl and (NH₄)₂SO₄ were the best. The optimal temperature for sporulation was 25℃，the optimal pH value was 7.0.The fungi could sporulate a lot on Caperb medium and under ultraviolet rays illuminated for 80 min. The optimal temperature for the germination of spore was 20-25℃，and the optimal pH value was 9.0.The number of germination of the spore decreased apparently when RH was below 86%.In a word，the fungi liked middle-highest temperature and high RH and was a middle type.
Key words: cotton；cotton boll rot disease pathogen；biological characteristics
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