Inhibitory efficacy of some agrochemicals on mycelial growth of Phytophthora cinnamomi isolated from heart-rot disease of pineapple (Ananas cosmosus (L.) Merr.)

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Research Paper 01/03/2021
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Inhibitory efficacy of some agrochemicals on mycelial growth of Phytophthora cinnamomi isolated from heart-rot disease of pineapple (Ananas cosmosus (L.) Merr.)

E. M. Ilondu, G. O. Ibuzor
Int. J. Micro. Myco.12( 3), 15-19, March 2021.
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Some agrochemicals have been tested and found effective in plant disease control to improve food security. Growth inhibitory efficacy of four agrochemicals against Phytophthora cinnamomi isolated from heart-rot disease of pineapple (Ananas comosus) in naturally infested farm at Site I of Delta State University, Abraka was evaluated using poisoned food technique. The fungicides (fungu-force, mancozeb, maneb and mackecknie gold) at the concentrations of 25 -5000 ppm were evaluated ­in-vitro for their effect on the colony diameter of P. cinnamomi in pre-amended PDA medium. The fungicides showed response in inhibiting the growth with a dose dependent effect except for the fungu-force which totally inhibited the fungus at all concentrations tested. Complete inhibition was recorded for Fungu-force at 25ppm, Mancozeb at 1000ppm, Mackecknie gold at 4000ppm and Maneb at 5000ppm. The result of this study can be utilised to develop suitable application regime of these fungicides for trials on farmer’s field in the control of heart-rot disease of pineapple and other crop diseases incited by this pathogen thereby improving food security.


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