Tolerance of citrus genotypes towards Pseudocercospora leaf and fruit spot disease in western highlands zone of Cameroon

Pseudocercospora leaf and fruit spot disease (PLFSD) is a serious production constraint to citrus growers in Africa and Yemen. An assessment of the disease was carried out in the location of Foumbot, western highlands of Cameroon characterised by monomodal rainfall patterns, low temperatures and hig...

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Bibliographic Details
Published in:	Crop protection Vol. 124; p. 104828
Main Authors:	Ndo, E.G.D., Kuate, J., Sidjeu Wonfa, C.S., Tchio, F., Ndzana Abanda, F.X., Mbieji Kemayou, C., Akoutou Mvondo, E., Amele Ndjoumoui, C., Amang A Mbang, J.
Format:	Journal Article
Language:	English
Published:	Elsevier Ltd 01-10-2019
Subjects:	Adaptation Canopy Citrus fungal disease Diameter Epidemiology Pseudocercospora angolensis Quarantine Citrus fungal disease Pseudocercospora angolensis Canopy Quarantine Epidemiology Diameter Adaptation
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Summary:	Pseudocercospora leaf and fruit spot disease (PLFSD) is a serious production constraint to citrus growers in Africa and Yemen. An assessment of the disease was carried out in the location of Foumbot, western highlands of Cameroon characterised by monomodal rainfall patterns, low temperatures and high relative humidity. The plot was set up in a complete randomised block design with eight replicates, with each comprising one stand of the 15 genotypes. The assessment was carried out in 2016, on 15 genotypes plot established in 2002, and was based on the disease impact on leaves and fruits. The impact of the disease was recorded on a scale of one to five, where one represented organ with 0% disease, and five the organs with more than 75%. Vegetative development of citrus tree attributes such as tree height, canopy mean diameter, scion and rootstock circumference were also recorded. Results showed that six genotypes presented the lowest disease severity. These are: Bearss Lime (1.75 ± 0.50), Obala Tangerine (2.00 ± 0.0), Sans Epines Lime (2.00 ± 0.53), Ponkan Yoshida (2.13 ± 0.35), Emperor Tangerine (2.43 ± 0.78) and Beauty Tangerine (2.57 ± 0.78). Ponkan Yoshida and Sans Epines Lime, that also presented the best morphological parameters, can be qualified as best candidates for their tolerance to PLFSD under these ecological conditions. Despite their morphological and tolerance to PLFSD, Bearss Lime showed 50% dead stands. Further investigations on opportune pests and diseases affecting citrus should be carried out to assess their contribution on these, on similar ecological environment. Display Omitted •Ponkan Yoshida and Lime Sans Epines are tolerant to Pseudocercospora disease of citrus.•Ponkan Yoshida and Lime Sans Epines can be introduced in western highland zones.•Despite tolerance to Pseudocercospora disease, Lime Bearss recorded high mortality.•Other pests and diseases may be involved in genotype behaviour.•Vegetative development may be implicated in Pseudocercospora disease tolerance.
ISSN:	0261-2194 1873-6904
DOI:	10.1016/j.cropro.2019.05.022