Examinando por Autor "Mugala, Thabu"

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Susceptibility of Spodoptera frugiperda (Lepidoptera: Noctuidae) to entomopathogenic fungi and bacteria under laboratory and field conditions.
(Universidad EARTH, 2018-12) Mugala, Thabu; Walter, Ndonkeu Tita
The use of biological methods for controlling pests is one of the many alternatives of pest management and has many environmental advantages compared to the use of pesticides. Susceptibility of Spodoptera frugiperda to various strains of entomopathogenic fungi and bacteria were evaluated under laboratory and field conditions. The treatments used in this experiment were commercial strains Beardox (Mogto4) and Beardox (Mogbv) containing 1 x 109 spores/ml of Beauveria bassiana, Metafix containing 1 x 109 spores/ml of Metarrhizium anisopliae, Cillium containing 1 x 109 spores/ml of Lecanicillium lecanii and Btis containing 1 x 109 spores/ml of Bacillus thuringiensis and in combinations with Bacillus thuringiensis. The results indicated that there was synergism between all the fungi and bacteria strains used even though strains like Lecanicillium lecanii generally produced low percentage mortality both under field and laboratory conditions as well as in combination with Bacillus thuringiensis at 1 x 109 spores/ml concentration, producing a mortality of 60 % and 70 % respectively. The results indicated that there were statistical differences between treatments both under Laboratory and field conditions with P<0.001. The treatment B. bassiana (Mogto4), M. anisopliae, B. bassiana (Mogto4) + B. thuringiensis, M. anisopliae + B. thuringiensis, mixture of all fungal strain, mixture of all fungal strains + B. thuringiensis had mortality percentages of 86.67 %, 93.33 %, 96.67 %, 96.67 %, 96.67 % respectively under field conditions. The results obtained under Laboratory conditions showed that B. bassiana (Mogto4) + B. thuringiensis and mixture of all fungal strains obtained the highest mortality of 100 % while the treatment with B. bassiana (Mogbv) had the least mortality of 70 %. The most common symptom of fungi and bacteria infestation on the insect was sporulation and mummification. Treatment with Lecanicillium lecanii obtained the highest foliage damage index.