Background, Current situation and management of the HLB and its ...

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There after, indexing results revealed that some young seedlings in the field shown characteristic HLB symptoms were free of tristeza. Therefore, tristeza is an agent which usually infects citrus simultaneously with HLB, but it is not the actual cause of HLB (Zhao et al.,1979).
Tetracyclin sensitivity of the causal agent of HLB was revealed by budwood dipping and trunk injection in the mid 1970’ (Kwangxi Citrus Yellow Shoot Study Group,1975). The tetracycline sensitivity of HLB pathogen indirectly proved that HLB is caused by mycoplasma mycoplasma-like like organism but not by virus.
Page 1 and 2: 2nd International Workshop on Citru
Page 3 and 4: 1. Distribution and importance 2. S
Page 5 and 6: Citrus Cultivation and HLB Occurren
Page 7 and 8: In 1980’, there was an apparent n
Page 9 and 10: HLB Occurrence and Psyllid Distribu
Page 11 and 12: In the area where citrus had not be
Page 13 and 14: Symptom
Page 15: “Yellow shoot” shown in the ini
Page 24: Most fruits of the diseased tree dr
Page 29 and 30: New root growth is suppressed and t
Page 31 and 32: Several causes of HLB have been sug
Page 33: In the early 1960’, there was a d
Page 40 and 41: Afterwards, the results of PCR test
Page 42 and 43: Some characteristics of HLB in graf
Page 44 and 45: As 1-16 16 years old mandarin trees
Page 46 and 47: Graft transmissibility influenced b
Page 48 and 49: No. plants diseased/ Grafting seaso
Page 50 and 51: Heat sensitivity
Page 52 and 53: Lo (1983) reported that budwoods co
Page 54 and 55: The transmission of HLB by citrus p
Page 56 and 57: Young seedlings could be infected b
Page 58 and 59: The relation between HLB prevalence
Page 60 and 61: A survey of 27 counties in Guangxi
Page 62 and 63: A survey conducted in 1977 in the f
Page 64 and 65: Before 1980’, in order to increas
Page 66 and 67: In the general survey, all of the v
Page 68 and 69: 1. Quarantine. HLB was defined as a
Page 70 and 71: 3. Producing and planting HLB free
Page 72 and 73: The exclusion of HLB by shoot shoot
Page 74 and 75: 5. Remove diseased plants plants. R
Page 76 and 77: Yangcun Citrus Farm was the biggest
Page 78 and 79: Since 1974 1974, , leaf rollers and
Page 80 and 81: Since 1993 1993, , the management s
Page 82: Thank you for your attention!

Background, Current situation and management of the HLB and its ...

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