|Authors: ||M.V. Huitrón, N. Rodríguez, M. Díaz, F. Camacho|
|Keywords: ||Citrullus lanatus, Fusarium oxysporum f. sp. niveum, graft, rootstocks, CPPU [1-(2-Cloro-4-piridil)-3-fenilurea]|
One of the main restrictions in the production of watermelon (Citrullus lanatus (Thunb.)) worldwide is the infestation by Fusarium oxysporum f. sp. niveum (Fon). Soil disinfections were commonly used by farmers without obtaining satisfactory results and the use of watermelon cultivars with resistance to F. oxysporum were not efficient in heavily infected soils.
In 1985, with the marketing of Japanese hybrids, began the use of grafted watermelon, which continues to date with excellent results.
Therefore in areas like Almería and Valencia, more than 95% of the watermelon grown is grafted.
The trial was conducted in a typical “parral” greenhouse at Almería, Spain.
Triploid watermelon cv.
Reina de Corazones grafted plants were grown without honeybee pollination, cultivated on artificial cover soil and fruit induction with 200 ppm of CPPU [1-(2-Cloro-4-piridi)-3-fenilurea]. The highest production values were obtained with the combination of ‘Reina de Corazones’ scion with Citrullus lanatus, Lagenaria siceraria or the inter-specific hybrid RS841 (Cucurbita maxima × Cucurbita moschata) rootstock.
These rootstocks didn’t have rooting and incompabilities problems. Sycios angulatus, called cucumber star (Lee, 2003), showed incompatibility problems and C. moschata showed poor rooting.
These rootstocks produced the lowest yield.
The rootstocks RS841, C. moschata, C. lanatus and Shintoza had a similar effect on the pulp firmness, rind thickness, longitudinal perimeter, transversal perimeter and the ratio of longitudinal perimeter/transversal perimeters.
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