| dc.description.abstract | The nutritional and economic value of tomato is universally recognized yet its production in many regions is still low due
to, among other reasons, fungal diseases. Farmers have desperately relied on synthetic chemical pesticides to manage the dis-
eases but the chemicals, in spite of their efficacy, are associated with residual detrimental effects on human health and environ-
ment. The objective of this study was to evaluate the antifungal activity of selected spices against important fungal pathogens
of tomato. Bioactive compounds from seven spices namely clove, black pepper, turmeric, ginger, lemongrass, cinnamon and
cardamom powders were extracted in ethanol and tested for antifungal activity against Alternaria solani, Fusarium oxysporum
f. sp lycopersici and Pythium sp. in poisoned food bioassay. The most active spice extracts were further tested for efficacy
against early blight of tomato under field conditions. All extracts were significantly active against the tested fungal pathogens
by about 85%. Clove extract was the most active against all the pathogens inhibiting their growth 100%. Ginger, black pepper
and turmeric extracts inhibited growth of all the pathogens by between 74-80%. Lemongrass extract was the least active with
an antifungal activity of about 49%. Under field conditions, clove remained active in reducing early blight disease load by
about 36% compared to the negative control. The antifungal activity demonstrated by the spice extracts is an indication that
they could be relied upon for disease control and this study recommends their consideration, especially clove, for formulation
into a botanical fungicide for management of early blight of tomato. | en_US |
