Studies On Biological Properties Of Paecilomyces Fumosoroseus And Its Disease Mechanism

This paper is the research about the biological properties of paecilomyces fumosoroseus (Wize) Brown & Smith, the quality to cause the Cabbage caterpillar infected and the mechanism of the infection. The result shown: 1.The most suitable C source for paecilomyces fumosoroseus (Wize) Brown & Smith is grape sugar and malt sugar. The fit range of growth temperature is 20-30 ℃,and the most suitable one is 27 ℃.The successive illumination accelerates the colony growth. The colony can grow under PH3-11.The suitable limit of such growth is PH 6-8 .Optimum PH is 7 (Natural PH ). 2. The grape sugar benefit that fungus to produce spores.The fit temperature limit to produce spores is 15℃-30℃,and the optimum temperature is 27 ℃. The successive illumination improves paecilomyces fumosoroseus (Wize) Brown & Smith that live on the PDA culture medium to yield spores and accelerates spores'germination. The fit range of PH for spores'germination is 6-8. The optimum PH is 7 。3. The fit temperature for paecilomyces fumosoroseus (Wize) Brown & Smith's spore to germinate is 20-33 ℃. The most suitable one is 27 ℃.That the temperature is more than 35℃or lower than 15 ℃is bad for the spore to germinate. The fit relative humidity for the spore to germinate is more than 75%. Successive illumination is favor for paecilomyces fumosoroseus (Wize) Brown & Smith to germinate.The fit PH for spore to germinate is 3-6 . The most suitable PH is 4-5. Acidity is favor for germination. 4. Tuwen-80 have no influence on paecilomyces fumosoroseus (Wize) Brown & Smith's germination rate. It can act as paecilomyces fumosoroseus (Wize) Brown & Smith's emulsifier. The suitable density is 0.05-0.3 %. 5.The density of 108 paecilomyces fumosoroseus (Wize) Brown & Smith...