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Compatibility of Steinernema carpocapsae and Heterorhabditis indica with Insecticides Registered against Helicoverpa armigera (Lepidoptera:Noctuidae)


Affiliations
1 Indian Institute of Pulses Research, Kanpur – 208024, Uttar Pradesh, India
2 National Bureau of Agricultural Insect Resources, Bengaluru – 560024, Karnataka, India
3 Indian Institute of Vegetable Research, Varanasi – 221305, Uttar Pradesh, India
 

The gram pod borer, Helicoverpa armigera (Lepidoptera: Noctuidae) is considered as a key pest of pigeonpea and is also a major polyphagous pest of several agricultural and horticultural crops in India. Combining chemical insecticides with Entomopathogenic Nematodes (EPNs) could be an effective alternative to reduce the use of harmful chemicals. Experiments were conducted to determine the compatibility of Steinernema carpocapsae and Heterorhabditis indica with registered insecticides used for H. armigera control in pigeon pea, under laboratory conditions. Compatibility of the insecticides with EPNs was evaluated by observing infective juveniles (IJs) survival and virulence of Galleria mellonella at 24 and 48 h after dipping in insecticide solutions. It was observed that, insecticides showed moderate effect on IJs survival. IJs were able to infect G. mellonella larvae after exposure to these chemicals, but their progeny production was significantly (P < 0.05) reduced. Both nematode species showed differential sensitivity to the tested insecticides, with H. indica exhibiting better tolerance than S. carpocapsae. The studies revealed that the chemicals showed a strong sub lethal effect on the nematode reproductive potential, limiting seriously their possible recycling in the field.

Keywords

Compatibility, Galleria mellonella, Helicoverpa armigera, Heterorhabditis indica, Steinernema carpocapsae.
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  • Compatibility of Steinernema carpocapsae and Heterorhabditis indica with Insecticides Registered against Helicoverpa armigera (Lepidoptera:Noctuidae)

Abstract Views: 277  |  PDF Views: 163

Authors

Devindrappa
Indian Institute of Pulses Research, Kanpur – 208024, Uttar Pradesh, India
Jagadeesh Patil
National Bureau of Agricultural Insect Resources, Bengaluru – 560024, Karnataka, India
Manjunatha T. Gowda
Indian Institute of Vegetable Research, Varanasi – 221305, Uttar Pradesh, India
R. Vijayakumar
National Bureau of Agricultural Insect Resources, Bengaluru – 560024, Karnataka, India

Abstract


The gram pod borer, Helicoverpa armigera (Lepidoptera: Noctuidae) is considered as a key pest of pigeonpea and is also a major polyphagous pest of several agricultural and horticultural crops in India. Combining chemical insecticides with Entomopathogenic Nematodes (EPNs) could be an effective alternative to reduce the use of harmful chemicals. Experiments were conducted to determine the compatibility of Steinernema carpocapsae and Heterorhabditis indica with registered insecticides used for H. armigera control in pigeon pea, under laboratory conditions. Compatibility of the insecticides with EPNs was evaluated by observing infective juveniles (IJs) survival and virulence of Galleria mellonella at 24 and 48 h after dipping in insecticide solutions. It was observed that, insecticides showed moderate effect on IJs survival. IJs were able to infect G. mellonella larvae after exposure to these chemicals, but their progeny production was significantly (P < 0.05) reduced. Both nematode species showed differential sensitivity to the tested insecticides, with H. indica exhibiting better tolerance than S. carpocapsae. The studies revealed that the chemicals showed a strong sub lethal effect on the nematode reproductive potential, limiting seriously their possible recycling in the field.

Keywords


Compatibility, Galleria mellonella, Helicoverpa armigera, Heterorhabditis indica, Steinernema carpocapsae.

References





DOI: https://doi.org/10.18311/jbc%2F2017%2F16205