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Chinese Journal of Applied Ecology ›› 2002, Vol. ›› Issue (7): 833-836.

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Factors influencing phthogenicity of Colletotrichum gloeosporioides f.sp. veronicae to Veronica persica

ZENG Qing1,2, QIANG Sheng 1   

  1. 1. Weed Research Laboratory, Nanjing Agricultural University, Nanjing 210095;
    2. Laboratory of Material Cyclingin Pedosphere, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008
  • Received:2000-12-22 Revised:2002-03-28 Online:2002-07-15

Abstract: The effects of the characters of the fungus, the growing period of plants and environmental factors on the pathogenicity of Colletotrichum gloeosporioides f.sp. veronicae infecting Veronica persica were studied in pot experiments. The results showed that 1.08×108spores·mL-1 suspension could kill the seedlings with two cotyledons within one week and cause old plants serious disease. 1×108 spores·mL-1 was optimal concentration and 1 or 2 weeks old was the best age of the spores for killing birdseye speedwell. The optimal temperature was 15~25℃ for the disease development. More than two days' dew exposure was required to kill the weed. However, the disease was also developed better when corn or soybean flour was added or the darkness period during dew exposure was prolonged.

Key words: Veronica persica, Colletotrichum gloeosporioides f.sp. veronicae, Pathogenicity, Influential factors

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