Abstract:

Abstract: The ability of Paecilomyces lilacinus strain PL050705 to compete with major fungi isolated from the rhizosphere of citrus with slow decline disease were determined in vitro. PL050705 have showed stronger antagonistic effects on all the fungi. Four treatment groups including water control(ck), PL050705+prawn shell powder（p+p），PL050705（p），ethoprophos (e) were made in field experiment. P. lilacinus strain could colonized with high population in rhizosphere of citrus in treatment group of p+p or p. Berger-Parker dominance index maintain higher lever（0.444～0.526）in treatment group of p+p, but decreased（0.590～0.256）in treatment group with p+p during the whole year. Shannon-Wiener diversity index of the fungi communities were in the order of p+p>p>ck>e. The results showed that PL050705 have antagonistic ability and good colonized ability in rhizosphere of citrus, could improved diversity of fungi communities especially treated with prawn shell powder.