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The toxic effect of citric and succinic acids on the germination of the pycnidiospores ofBotryodiplodia theobromae, mycelial growth and the killing rate of theB. theobromae spores was investigated. The percentage inhibition of germination of viable fungal spores by 0.01% succinic or citric acid ranged between 51.6 and 58.1%, respectively.B. theobromae was found to grow in 2% malt extract broth at 28 degrees C at the rate of 0.13 CFU/h. Citric acid exhibited a higher killing rate of 0.26 CFU/h and was more effective against the germination of the fungal spores. At concentrations of 0.3% and above, citric acid could be used as pre- and post-infectional fungicide.

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