A study on the comparative effect of cow dung, wood ash and benlate for the control of leaf spot disease of Roselle (Hibiscus sabdariffa L.) was carried out following the preparation and foliar application of the mate...A study on the comparative effect of cow dung, wood ash and benlate for the control of leaf spot disease of Roselle (Hibiscus sabdariffa L.) was carried out following the preparation and foliar application of the materials on selected Roselle plants of the green and red accessions (Acc<sub>1</sub> & Acc<sub>3</sub>) in the field. The cow dung was fermented for 14 days while sour milk was added to wood ash, dissolved and all filtered and labeled. The spraying commenced soon after the plants were thinned to one and was done weekly until after 50% of the plants had flowered. Results showed significant (p = 0.05) difference between benlate, the synthetic fungicide and the bio-fertilizers (cow dung and wood ash) for the two years of the study. Disease severity was significantly lower in the benlate than in the bio-fertilizers. There was no significant difference in yield between the treatments although higher yield was recorded in benlate. Though the bio-fertilizers could not suppress infection, they aided the growth of the plants by boosting luxuriant growth. The result showed that these bio-fertilizers cannot be used as substitute to the synthetic fungicide for the control of this leaf spot disease caused by Coniella musaiensis var. hibisci. However, since they give equally good yield the bio-fertilizers can still be used to minimize the reliance upon use of chemical fungicides.展开更多
This study investigated the phytochemical screening of some plant extracts against aflatoxin producing fungi in sesame (Sesamum indicum). The plants are Prosopis africana, Psorospermum febrifugum and rhizome of Curcum...This study investigated the phytochemical screening of some plant extracts against aflatoxin producing fungi in sesame (Sesamum indicum). The plants are Prosopis africana, Psorospermum febrifugum and rhizome of Curcuma longa. Various parts of the plants were dried, grounded and extracted in methanolic solvent. The preliminary phytochemical screening of methanol extracts for stem bark, leaves and rhizome of Curcuma longa revealed the presence of saponins, flavonoids, steroids, cardiac, glycosides, terpenoids, phenols and tannins. The result of anti-aflatoxigenic activity indicates that methanol extracts of these plants show significant activity against the fungi isolates. The effect of plants extracts on mycelia growth of the test organism reduced the mycelia growth significantly as compared to the control (Plate 6 (a-f)). In view of the efficacy of the activity of the plant extracts, it could be concluded that these medicinal plants possess antifungal properties that can be exploited for the control of aflatoxin in sesame. Further works are needed to investigate the biological active ingredients of these plants.展开更多
文摘A study on the comparative effect of cow dung, wood ash and benlate for the control of leaf spot disease of Roselle (Hibiscus sabdariffa L.) was carried out following the preparation and foliar application of the materials on selected Roselle plants of the green and red accessions (Acc<sub>1</sub> & Acc<sub>3</sub>) in the field. The cow dung was fermented for 14 days while sour milk was added to wood ash, dissolved and all filtered and labeled. The spraying commenced soon after the plants were thinned to one and was done weekly until after 50% of the plants had flowered. Results showed significant (p = 0.05) difference between benlate, the synthetic fungicide and the bio-fertilizers (cow dung and wood ash) for the two years of the study. Disease severity was significantly lower in the benlate than in the bio-fertilizers. There was no significant difference in yield between the treatments although higher yield was recorded in benlate. Though the bio-fertilizers could not suppress infection, they aided the growth of the plants by boosting luxuriant growth. The result showed that these bio-fertilizers cannot be used as substitute to the synthetic fungicide for the control of this leaf spot disease caused by Coniella musaiensis var. hibisci. However, since they give equally good yield the bio-fertilizers can still be used to minimize the reliance upon use of chemical fungicides.
文摘This study investigated the phytochemical screening of some plant extracts against aflatoxin producing fungi in sesame (Sesamum indicum). The plants are Prosopis africana, Psorospermum febrifugum and rhizome of Curcuma longa. Various parts of the plants were dried, grounded and extracted in methanolic solvent. The preliminary phytochemical screening of methanol extracts for stem bark, leaves and rhizome of Curcuma longa revealed the presence of saponins, flavonoids, steroids, cardiac, glycosides, terpenoids, phenols and tannins. The result of anti-aflatoxigenic activity indicates that methanol extracts of these plants show significant activity against the fungi isolates. The effect of plants extracts on mycelia growth of the test organism reduced the mycelia growth significantly as compared to the control (Plate 6 (a-f)). In view of the efficacy of the activity of the plant extracts, it could be concluded that these medicinal plants possess antifungal properties that can be exploited for the control of aflatoxin in sesame. Further works are needed to investigate the biological active ingredients of these plants.
