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The pathogen of pitaya stem rot in Guangxi was isolated by the tissue separation method and the microbial control of the disease was selected. According to Koch’s rule, the pathogenicity was verified by in vitro experiments, and the pathogenic species were identified by the morphological and multi-gene sequence analysis. Then, the biocontrol bacteria were screened by the plate confrontation method. The results showed that two pathogenic fungi, Lasiodiplodia pseudotheobromae and Neoscytalidium dimidiatum, were isolated from the decayed stems of pitaya, of which L. pseudotheobromae was the first reported to cause pitaya stem rot in China. Taking L. pseudotheobromae PY6 as the target pathogen, Bacillus subtilis L3-4 with the best control effect was obtained from 34 strains of pitaya endophytes screened, which could make the mycelium of PY6 entangled and broken. The sterile fermentation filtrate and the sterile fermentation broth after 100 ℃ treatment had antibacterial effect, and the prevention effect could reach 72.08% and 71.16%, respectively. But it did not produce volatile compounds that inhibited the growth of PY6 strain. In addition, strain L3-4 exhibited inhibition to Botryosphaeria dothidea, Fusarium pseudograminearum, F. oxysporum and N. dimidiatum with inhibition rate 77.65%, 73.13%, 64.07% and 62.01%, respectively. This study clarified the pathogenic pathogen responsible for pitaya stem rot in Guangxi. The screened biocontrol bacteria could be used as candidate strain for controlling pitaya stem rot. The result would provide a theoretical basis for diagnosing and biologically controlling pitaya stem rot.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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