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试验表明,柑桔脚腐病主要病原菌为寄生疫霉phytophthora parasitica。其生长发育的温度在10～35℃之间,最适温为25～28℃。在pH4～9的培养基上能生长,但以pH4～7为最佳。全黑暗有助于菌丝生长。紫外光连续照射,对疫霉菌生长有抑制作用。疫霉菌能有效地利用各种碳源,而以蔗糖、葡萄糖效果最佳,能使菌丝生长浓厚,孢子囊多而大;可溶性淀粉对菌丝生长好,孢子囊多而小;甘油能使菌丝生长繁茂,但孢子囊少。氮源对菌丝生长的影响不显著,但对增进孢子囊产生的作用较大,以氨基酸类最优。
Experiments show that the main pathogen of citrus foot rot is Phytophthora parasitica. Its growth and development temperature is between 10 ~ 35 ℃, the optimum temperature is 25 ~ 28 ℃. Growth in pH4 ~ 9 medium, but with pH4 ~ 7 is the best. All dark helps mycelium growth. Continuous UV irradiation, Phytophthora growth inhibition. Phytophthora can effectively use a variety of carbon sources, and sucrose, glucose best, can make the mycelium grow thick, large and large sporangia; soluble starch growth of mycelium, sporangia more and smaller; glycerol can make Mycelium grows lush, but less sporangia. The effect of nitrogen source on mycelium growth was insignificant, but it had a greater effect on enhancing sporocyst production, with the best amino acids.