Control Effect of Bacillus amyloliquefaciens on Grape Powdery Mildew

PurposeTo determine the control effect of Bacillus amyloliquefaciens on grape powdery mildew, and to provide theoretical basis for the control of grape powdery mildew in Yunnan.

MethodsIn the first (middle and low altitude hot dry river valley area, Binchuan) and the second (high altitude cold area, Xundian) incidence peak of grape powdery mildew in Yunnan, drug trials of grape powdery mildew were carried out respectively. Bactericide (myclobutanil + pyraclostrobin) and B. amyloliquefaciens were used to prevent and control of powdery mildew in the field. The photosynthetic rate of grape leaves treated with B. amyloliquefaciens was also measured.

ResultsIn the first incidence peak of grape powdery mildew, the control effect of B. amyloliquefaciens was 70.00% after three times of application, although it was significantly lower than that of fungicides (P<0.05). In the second incidence peak of grape powdery mildew, the control effect of B. amyloliquefaciens was 65.00% after three times of application, which was significantly higher than that of fungicides (P<0.05). In addition, B. amyloliquefaciens could significantly increase the net photosynthetic rate and stomatal conductance (P<0.05) of grape leaves.

ConclusionB. amyloliquefaciens can effectively control grape powdery mildew and promote the photosynthesis of grape leaves. Therefore, B. amyloliquefaciens can be used to control grape powdery mildew in grape fields in Yunnan.