Susceptibility of white grub, Brahmina coriacea (Hope) infesting potato to local strains of Beauveria brongniartii (Saccardo) in Himachal Pradesh


Affiliations

  • CSK Himachal Pradesh Krishi Vishvavidyalya, Department of Entomology, Palampur, Himachal Pradesh, 176062, India

Abstract

Brahmina coriacea (Hope) is the most widely distributed and destructive species of white grubs having potential to inflict 40-50 per cent yield losses to potato in Himachal Pradesh. The efficacy of two local isolates of Beauveria brongniartii (KH I and KH II) was evaluated against grubs of B. coriacea by dip treatment and oral feeding methods. Against first and second instar grubs, KH I in dip treatment proved to be highly effective, whereas for third instar grubs, KH I through oral feeding showed higher virulence. The LC50 values for first instar grubs for KH I and KH II were 2.55×105 conidia/ml and 2.80×105 conidia/ml in dip treatment, whereas in oral feeding method, the LC50 values were 7.27×105 conidia/ml and 9.69×105 conidia/ml, respectively. Against second instar grubs, LC50 values calculated were 2.91×105 conidia/ml and 3.98×105 conidia/ml for KH I and KH II in dip treatment, whereas corresponding values through oral feeding method were 5.36×105 conidia/ml and 8.82×105 conidia/ml. LC50 values for third instar grubs were 4.47×105 conidia/ ml and 4.88×105 conidia/ml for KH I and KH II in dip treatment, whereas through oral feeding, LC50 values were 3.03×105 conidia/ml and 5.14×105 conidia/ml for KH I and KH II, respectively.

Keywords

Brahmina coriacea, Beauveria brongniartii, Himachal Pradesh, potato, susceptibility

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