Effect of specific microbial flora on growth of Diaporthe citri in citrus twigs
2008
Masui, H.(Shizuoka-ken. Government Office (Japan)) | Ohta, K. | Serizawa, S.
The fungous flora and its effect on growth of D. citri were investigated in 5 citrus fields that were variously damaged with citrus melanose in Shizuoka prefecture, Japan. In two fields in the eastern area where the damage from citrus melanose was significantly lower despite fewer (twice) application of fungicide, 9 kinds of fungus were detected from dead twigs that were held inside the citrus canopy. The composition of fungi in the eastern area was different from that in the 2 fields in the central area where the damage from citrus melanose was high despite of four applications, but was similar to that in the nonchemical control field in the central area. Colletotrichum sp. isolated from 2 fields in the eastern area and the non-chemical control field in the central area mostly inhibited sporulation of D. citrl in dead twigs. 3 kinds of fungus (SB, SC, SD) isolated from only 2 fields in the eastern area inhibited spolulation of D. citri. The only fungus isolated from one field in the central area was the fungus SE that was detected in all the fields. 11 kinds of fungus were detected from another field in the central area, but their composition was different from that in the eastern area. The fungus ID was detected most frequently among the 11 kinds of fungus which inhibited spolulation of D. citri and was less than 3 other kinds of fungus (SB,SC,SD).
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