Candidatus Liberibacter spp.are kind of gram-negative bacteria which are transmitted by insects and parasitizes on phloem,causing the destructive disease,Huanglongbing(HLB),on citrus.Citrus infected with HLB will decline or lose the ability to bear fruit within 3 to 5 y...MORE Candidatus Liberibacter spp.are kind of gram-negative bacteria which are transmitted by insects and parasitizes on phloem,causing the destructive disease,Huanglongbing(HLB),on citrus.Citrus infected with HLB will decline or lose the ability to bear fruit within 3 to 5 years.At present,there are no effective pesticide to ...