Annual dynamic change of Asian citrus psyllid in carrying Las-bacteria
Citrus huanglongbing (HLB) disease, caused by “Candidatus Liberibacter”, is currently the most destructive disease of citrus worldwide. The key to preventing HLB disease involves the control of the citrus HLB disease vector insects. Such insects are referred to as Asian citrus psyllid (Diaphorina ci...
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| Main Authors: | , , , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Zhejiang University Press
2017-01-01
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| Series: | 浙江大学学报. 农业与生命科学版 |
| Subjects: | |
| Online Access: | https://www.academax.com/doi/10.3785/j.issn.1008-9209.2016.06.131 |
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| Summary: | Citrus huanglongbing (HLB) disease, caused by “Candidatus Liberibacter”, is currently the most destructive disease of citrus worldwide. The key to preventing HLB disease involves the control of the citrus HLB disease vector insects. Such insects are referred to as Asian citrus psyllid (Diaphorina citri). It is generally held that the tender shoots provide abundant food materials in favor of psyllid oviposition, therefore leading to an increase in psyllid population particularly at the citrus sprouting stage. As a result, HLB disease prevention was proposed in spring and autumn flush via chemical control of Asian citrus psyllid.Las bacterium content of HLB-infected citrus trees was detected via the qPCR technology. The detection was carried out on a monthly basis throughout the whole year at the Huangyan district of Zhejiang Province. The results showed that the content of Las bacterium for HLB-infected citrus tree varied dramatically with time in a year. The highest value for the content of Las bacterium was observed in December, followed by November, but no significant difference (P>0.05) was found between these two months. This was the case with the other months, whose values were lower (P<0.05) than those detected in December and November.Apart from the detection for the content of Las bacterium, the Las-holding ratio of Asian citrus psyllid (Diaphorina citri) captured from HLB-infected citrus tree was also detected. The highest ratio was found in December, which was not significantly different from that in January, but significantly higher than those detected in other months at P=0.05 level. Meanwhile, the pathogen quantity of Asian citrus psyllid showed that the average content of Las bacterium was highest during the period from December to the following January. This indicated that the Las-holding ratio of Asian citrus psyllid was directly affected by the content of Las bacterium for HLB-infected citrus trees. That is, the higher the ratio of Asian citrus psyllid, the more readily the spread of citrus HLB disease. Given that the spread of citrus HLB disease reached to peak in December and January, winter and spring would be the crucial period of controlling Asian citrus psyllid in order to prevent HLB disease. |
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| ISSN: | 1008-9209 2097-5155 |