ROLE OF CERTAIN BEAUVERIA BASSIANA ISOLATE AS BIOLOGICAL CONTROL AGENT AGAINST WHITEFLY, BEMISIA TABACI (GENN.) AND ITS EFFECT ON THE PREDATOR CHRYSOPELA CARNEA (STEPHENS)

Document Type : Original Article

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Economic Entomology Unit, Plant Protection Department, Desert Research Center.

Abstract

The lethal effect of Beauveriabassiana isolateon whitefly Bemisia tabaci revealed that the least percentage of adult mortality was 11%, which was recorded with the lowest tested concentration (1X103 spores/ml), while the highest percentage of adult mortality (56%) was achieved at 1X107 spores/ml, compared with 5% in natural mortality. In a similar trial to evaluate the effect ofB. bassiana against the aphid lion Chrysopela carnea (Stephens), exposure of the2ndlarval instar of aphid lion to B. bassianaisolate,either through direct or indirect exposure, resulted in adverse effects on the total percent of larval mortality, which was concentration dependent. Whereas the total larval death recorded 3% in control trials, data in case of direct exposure revealed 9 to 41% of larval death at 1X103and 1X107 spores/ml, respectively. Comparable trend was recorded with larvae indirectly exposed. Increase in larval mortality was recorded by 5 to 15%. Therefore, care is needed when using these fungal isolates in the case of using larval predator aphid lion in the programs of integrated control.

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History

  • Receive Date: 24 March 2020
  • Accept Date: 24 March 2020

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