Resumo

RAMIREZ-GERARDO, Marithza Guadalupe; VERGARA-MARTINEZ, César; VERGARA-MARTINEZ, Luis Miguel  e  MEJIA-CARRANZA, Jaime. Spatial arrangement of cultivars of Chrysanthemum (Dendrathema grandiflora) to decrease damage by Botrytis. Rev. mex. fitopatol [online]. 2019, vol.37, n.2, pp.220-236.  Epub 30-Set-2020. ISSN 2007-8080.  https://doi.org/10.18781/r.mex.fit.1812-4.

Botrytis cinerea (Teleomorph: Botryotinia fuckeliana) is the causal agent of gray rot in chrysanthemum (Dendrathema grandiflora), one of the most important cut flower crops in Mexico. Chena (Ch), a cultivar with greater commercial demand, is more susceptible to this fungus with respect to cultivars such as Flamingo (F) and Moreliana (M). In this investigation, the incidence of B. cinerea and the quality of the floral stem in the Chena cultivar were evaluated under three spatial arrangements consisting of A1, Chena flanked by Flamingo (F-Ch-F); A2, Chena flanked by Moreliana (M-Ch-M) and A3 only Chena (Ch-Ch-Ch). At the cut of the floral head, B. cinerea was present only in A3 (22 %) and in cuttings life at 16 days, Chena in A3 showed 100 % infection, followed by A1 and A2 with 15 and 0 %, respectively. The quality of Chena’s floral stem (height, diameter of the flowered head, stem thickness) in arrangements A1 and A2 was significantly higher (P≤0.05) compared to A3. The low incidence of B. cinerea in Chena in A1 and A2 indicates that Flamingo and Moreliana as lateral barriers may be useful in reducing the disease incidence and the use of fungicides.

Palavras-chave : polyculture; flowers; Moreliana; Chena; Flamingo.

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