Evaluation of Lemongrass, Eucalyptus and Neem Aqueous Extracts for Controlling Seed-borne Fungi of Sorghum Grown in Burkina Faso

Somda, I.; Leth, V.; Sérémé, P.
March 2007
World Journal of Agricultural Sciences;Mar2007, Vol. 3 Issue 2, p218
Academic Journal
Aqueous extracts of Cymbopogon citratus (lemongrass), Eucalyptus camaldulensis (eucalyptus) and Azadirachta indica (neem) were tested for inhibitory activity against Colletotrichum graminicola, Phoma sorghina and Fusarium moniliforme in naturally infected sorghum seeds. Two seed samples (red and white cultivars) exhibiting different rates of infection by the target fungi were treated with two concentrations of each plant aqueous extract (15 and 30% (w/v)). Moist blotter paper and growing-on tests were performed to evaluate the efficacy of botanicals to control fungi on sorghum seeds and seedlings. Aqueous extract of C. citratus exhibited the best control effect on seed infection by C. graminicola and P. sorghina and subsequent seed to seedling transmission of C. graminicola. Infections by C. graminicola and P. sorghina were significantly reduced by more than 60% when using 15% concentration and by 100% when using 30% concentration of lemongrass extract. Lemongrass extract did not affect the seedling development. Eucalyptus and neem seed aqueous extracts were not effective in controlling seed infection and seed transmission of the test fungi, but increased seedling emergence. Lemongrass extract has potential as sorghum seed disinfectant against C. graminicola and P. sorghina.


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