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Sci-Afric Journal of Scientific Issues, Research and Essays (SJSIRS)

Sci-Afric Journal of Scientific Issues, Research and Essays Vol.5(8) Pp. 074-077 August 2017 Copyright 2017 Sci-Afric Publishers.


Effects of Benomyl Soil Treatments on Cassava Response to Diseases, Pests and Mycorrhizal Symbiosis


*Victor Irogue Omorusi1, Dafe Ayanru2, and Clara Leyibo Igeleke3

1Plant Protection Division, Rubber Research Institute of Nigeria, Iyanomo, Benin City, Nigeria
2Department of Microbiology, University of Benin, Benin City, Nigeria
3Department of Basic Sciences, Benson Idahosa University, Benin City, Nigeria

*Corresponding Author email: iroomorusi@gmail.com


Accepted July 21st, 2017


This paper studied the effects of benomyl soil treatments on cassava response to diseases, pests and mycorrhizal symbiosis. It highlights the importance of the use of benomyl- a fungicide, to control incidences of pests and diseases of cassava for sustainable agriculture. Soil drenches of benomyl (Methyl-I-butylcarbomyl)–2-benzimidazolecarbamate) were applied at 0, 25, 100, 200, 500 and 1000 μg/g in 4.2 kg heat sterilized soil samples. Mycorrhizal spores in soils and root colonization of cassava were estimated at 5.5 months after planting. Shoot heights and girths (cm) and leaf numbers were assessed at 5.5 months. Incidences of cassava green spider mite (CGM) and cassava mealy bug (CM)were rated on a scale of 1 (symptom free) to 5 (severe symptom); African cassava mosaic disease (ACMD) rated bimonthly from 3.5 to 5.5 months on a scale of 0-5; cercospora leaf spot disease (CLSD) assessed on the leaf spot numbers per plant and the infection index calculated. Plants grown in 200, 500and 1000 μg/g benomyl treated soils died of severe phytotoxicity. Mycorrhizal spores and root colonization were significantly higher in the control experiments (P<0.01) with percentage decreases of 44 and 67% per g/soil of spores, and root colonization of 31 and 48%, in the 25 and 100 μg/g, respectively. Benomyl treatment at 25 and 100 μg/g, respectively, significantly increased plant vigour (stem and girth) (P<0.01), with increases by 12.15 to 18.69% for height, and 8.47 to 23.73% for girth. Mycorrhizal symbiosis was lowest in plants amended with doses of benomyl. Effects of benomyl significantly reduced CLSD (P<0.05). No significant effects were detected for CGM, CM and ACMD. The study showed effects of benomyl in increased plant growth and capable of controlling a viral plant disease (CLSD) of cassava.


Keywords: Benomyl, Mycorrhizal, cercospora leaf spot disease (CLSD), African cassava mosaic disease (ACMD).



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