Pathogen Identification and Biological Characteristics of Pineapple Anthracnose
LUO Zhi-wen et al(College of Environmental and Plant Protection,Hainan University,Danzhou,Hainan 571737)
[Objective]The pathogen of pineapple anthracnose were isolated and identified,and the biological characteristics of the pathogen were studied.[Method]Pathogen was isolated and purified from the leaves collected from different areas in Hainan province which had been infected by pineapple anthracnose,and the biological characteristics were studied after morphological identification of the pathogen.[Results]The pathogen of pineapple anthracnose was identified as Colletorichum gloeosprioides Penz.through morphological characteristics.The results of biological characteristic test showed that the optimum temperature for mycelium growth and spore germination were 25-30 and 28-30 ℃,respectively;and the optimum pH value was 6-8;complete darkness was the best condition for growth of mycelium,while alternative light and darkness was the most beneficial condition for spore germination;the best carbon sources for mycelium growth were glucose,D-fructose and maltose;in addition to L-grabinose and D-galactose,the other carbon sources all had promotion effect on spore germination;yeast extract,peptone and beef extract were proved to be beneficial for mycelium growth and spore germination,Aspartic acid was only beneficial for spore germination;spores were just able to germinate when the relative humidity was greater than 90%,spore germination was the highest under water drops condition.[Conclusion]The results laid preliminary basis for the control of pineapple anthracnose.