Histopathology and control of Botryodiplodia theobromae rot of date palm off-shoot (Phoenix dactylifera L.) variety Zaghloul.
Kamhawy M. A., Mahrous H. A. H., Shalaby M. S., El-Sharabasy S. M.
Author Affiliation: Plant Pathology Research Institute, Agricultural Research Center, Giza, Egypt.
Egyptian Journal of Agricultural Research 83 : 1533-1546
Abstract : The pathogenic capabilities of fifteen isolates of Botryodiplodia theobromae, isolated from mango, grapevine, apple, apricot, plum, peach, pear, persimmon and palm in Egypt were studied on date palm (cv. Zaghloul) off-shoot. All isolates were pathogenic on date palm off-shoot except the mango isolates. Seven days after inoculating date palm off-shoots, with grapevine isolate the fungal hyphae were clearly noticed in parenchyma cells and spread towards phloem, xylem parenchyma and protoxylem causing necrosis. At 14 days after inoculation, the fungal hyphae completely colonized the meta-xylem. The linear growth of B. theobromae was completely inhibited at 10 ppm of thiophanate-methyl (Hista 70% w.p) and carbendazim (Actazime 50% w.p) followed by pyrifenox (Dorado 200 E.c) at 40 ppm. and propioconazol as (Cornazol 10 Ec) at 50 ppm. Carbendazim and thiophanate-methyl gave the best control followed by propioconazol and pyrifenox.