P. M. Praveen ¹, N. Dhandapani ¹

Affiliations
1 Department of Agricultural Entomology Tamil Nadu Agricultural University Coimbatore 641 003, Tamil Nadu, IN

Abstract

Effect of biopesticides, viz., Bacillus thuringiensis subsp. Kurstaki, nuclear polyhedrosis virus and neem formulation on consumption, digestion and utilisation of tomato fruits by the fruit borer, Helicoverpa annigera (Hubner) was studied. In general food intake, faecal matter voided and weight gained by the larvae were lower in biopesticide treated fruits than in untreated ones. The total food consumed (0.008g), weight of faeces voided (0.0015g), larval weight gain (0.0018) and feeding period (1.25 days) were the lowest in B.t. @ 0.5g/lit. whereas, it was 1.6582g, 0.9404g. 0.271g and 10.83 days in untreated check, respectively. The consumption index (CI) was lowest in B.t. @ 0.2g/lit (0.098). Growth rate (GR), approximate digestibility (AD), efficiency of conversion of ingested food to body substance (ECI) and Efficiency of Conversion of Digested food to body matter (ECD) were also worked out and discussed.

Keywords

Biopesticides, Helicoverpa armigera, Tomato, Utilization.

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M. Kalyana Sundaram ¹, N. Dhandapani ¹, M. Swamiappan ¹, P. C. Sundara Babu ¹, S. Jayaraj ¹

Affiliations
1 Centre for Plant Protection Studies Tamil Nadu Agricultural University, Coimbatore - 641003, IN

Abstract

Results of a field experiment conducted to compare the field efficacy of biocontrol agents with locally recommended practice of using chemical insecticides revealed that use of Trichogramma chilonis (Ishii) (1,00,000/ha) and Chrysoperla carnea (Banks) (50,000/ha) 40 and 55 days after sowing could effectively check the population of Hellcoverpa armlgera (Bubn.) and Bemisia tabaci (Genn.), This was on par with insecticides. Application of Nuclear Polyhedrosis Virus of Spodoptera litura (Fb.) at 250 larval equivalents +2.5 kg crude sugar/ha could effectively control the larval population of S. litura, Pod yield was increased significantly in biocontrol plots which was on par with chemical insecticide-treated plots.

Keywords

Groundnut, Biocontrol,Helicoverpa armigera, Spodoptera litura, Bemisia tabaci, Empoasca kerri.

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N. Dhandapani ¹, M. Kalyanasundaram ¹, P. C. Sundara Babu ¹, S. Jayaraj ¹

Affiliations
1 Department of Entomology, Tamil Nadu Agricultural University, Coimbatore - 641 003, IN

Abstract

Field experiments conducted against Spodoptera litura (Fab.) with nuclear polyhedrosls virus (NPV) on tobacco (Nicotiana tabacum L.) in twelve different locations of Tamil Nadu indicated that two rounds of application at 250 larval equivalents (LE)/ha with crude sugar 2.5 kg/ha at 10, days Interval was significantly superior to untreated control in reducing the larval population, irrespective of the locations tested.

Keywords

NPV, Spodoptera litura, Tobacco.

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N. Dhandapani ¹, S. Jayaraj ¹

Affiliations
1 Centre for Plant Protection Studies, Tamil Nadu Agricultural University, Coimbatore 641 003, IN

Abstract

Results of the field experiment on the control of Spodoptera litura (Fab.) on Chillies (Capsicum annuum L.) with nuclear polyhedrosis virus (NPV) and certain insecticides revealed that two rounds of application of the virus as a water dispersible power (WDP) or unformulated virus at 250 larval equivalents (LE)/ha at 10 days interval was as effective as fenpropathrin 200 g a.i/ha or fenpropathrin 100 g a.i/ha + NPV (WOP) 125 LE/ha in reducing the larval population and fruit damage. NPV was also as effective as chlorpyrlphos 250 g a.i/ha + fenitrothion 188 g a.i/ha in reducing the fruit damage by S. litura.

Keywords

NPV Formulation (WDP), Spodoptera litura, Field Efficacy, Chillies.

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