Infection process and pathogenicity of Beauveria bassiana (Balsamo) Vuillemin against Tetranychus urticae Koch
| Autor: | P.R. Nithya, S. Manimegalai, R. Vishnupriya, S. Athisintha, P. Muthulakshmi |
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| Rok vydání: | 2019 |
| Předmět: | |
| Zdroj: | Annals of Plant Protection Sciences. 27:194 |
| ISSN: | 0974-0163 0971-3573 |
| DOI: | 10.5958/0974-0163.2019.00040.5 |
| Popis: | The two-spotted spider mite, Tetranychus urticae is an important pest worldwide, the incidence of which led to reduce crop yields or poor marketability of the produce, both under field and protected cultivation. Insecticides usage for management lead to problems of resistance and residue and mycoinsecticides are the best alternative. Hence in this study, the infectivity of a native isolate of the entomopathogenic fungus, Beauveria bassiana MK918495 to T. urticae was revealed through scanning electron microscope and pathogenicity studies. SEM photographs taken at different hrs after infection showed the processes of infection, viz., adhesion, germination, penetration, colonization, extrusion and conidiogenesis on different body region of mite at 24 hrs, 48–72 hrs, 72–96 hrs, 96–120 hrs, 120 hrs and 120–144 hrs, respectively. The efficacy of the isolate was evaluated against T. urticae at different concentrations ranging from 4×104 to 4×109 spores mL−1 and the result showed that the mortality ranged from 27.6 to 89.2% at 7 days after treatment. The LC50and LC90 of B. bassiana spore suspension were worked out to be 1.0×106 and 2.1×108 spores mL−1, respectively. |
| Databáze: | OpenAIRE |
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