Indexed on: 20 Dec '18Published on: 20 Dec '18Published in: Pest Management Science
'Candidatus Liberibacter asiaticus' is transmitted by Diaphorina citri, an insect with a wide range of hosts in Rutaceae. Citrus relatives occur in Brazilian forests where they may serve as hosts for psyllids and infested citrus orchards. Suitability of the plants as hosts of D. citri were separated into four groups. Group I (highly suitable to the insect): Citrus ×aurantium 'Valencia', 'Citrus limonia', Murraya paniculata (syn. Murraya exotica L.) (Aurantioideae: Aurantieae) and Bergera koenigii (Aurantioideae: Clauseneae). Group II (intermediate to low suitability): Citrus (Poncirus) trifoliata 'Pomeroy', Citrus wintersii, Swinglea glutinosa (Aurantieae) and Clausena lansium (Clauseneae). Group III (not suitable): Aegle marmelos, Atalantia buxifolia, Citrus ('Microcitrus') sp. (Aurantieae) and Helietta apiculata (Amyridoideae). Group IV (non-hosts): Glycosmis pentaphylla (Clauseneae), Balfourodendron riedelianum, Casimiroa edulis, Esenbeckia febrifuga, Esenbeckia leiocarpa, Metrodorea stipularis, Zanthoxylum rhoifolium (Amyridoideae) and Dictyoloma vandellianum (Cneoroideae). Insects survived longer on newly differentiated than fully expanded soft leaves. The psyllids did not develop, or survive for long intervals, on most Group IV species, all of which, with the exception of G. pentaphylla, occur naturally in Brazilian forests. Citrus relatives occurring in forests near citrus orchards are not suitable to the D. citri and, therefore, are not contributing to huanglongbing spread. This article is protected by copyright. All rights reserved. This article is protected by copyright. All rights reserved.