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G. Srinivasan ¹, P. C. Sundara Babu ²

Affiliations
1 Central Institute for Cotton Research - Regional station, Coimbatore 641 003, Tamil Nadu, IN
2 Department of Agricultural Entomology Tamil Nadu Agricultural University Coimbatore 641 003, Tamil Nadu, IN

Abstract

Insecticides showed distinct deleterious effects on different life stages of predatory green lacewing, Chrysoperla carnea Stephens. Abamectin caused the maximum egg mortality of 25.2 per cent as against 0.3 per cent in control. Carbaryl affected the grubs more and the mortality was 83.3 per cent. Endosulfan and ahamectin had no adverse influence on the grubs and the grub mortality was only 3.3 and 6.7 per cent. respectively. Adult emergence was highly affected by carharyl, which recorded only 10.00 per cent as against 93.33 per cent adult emergence in control. The time taken for cent per cent mortality of adults in control was 23.33 days, but in the case of quinalphos (0.04%), it was 0.66 days and the fecundity was 0.5 eggs as against 160.4 eggs in control.

Keywords

Chrysoperla carnea, Insecticides, Toxicity.

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D. Sundararaju ¹, P. C. Sundara Babu ²

Affiliations
1 National Research Centre for Cashew, Puttur 574 202, Karnataka, IN
2 Department of Agricultural Entomology, Tamil Nadu Agricultural University, Coimbatore 641 003, Tamil Nadu, IN

Abstract

The egg parasitoids of Helopeltis antonii Signoret existing in neem endemic area (coastal and hinterland of Tamil Nadu) and in non-neem endemic area (western ghats of Tamil Nadu and coastal Karnataka) are Telenomus sp. laricis group (Scelionidae), Erythmelus helopeltidis Gahan (Mymaridae), Chaetostricha sp. and Ufens sp. (Trichogrammatidae). Telenomus sp. is very much dominant in non-neem endemic areas, whereas Ufens sp. is quite prominent in neem endemic areas. When the eggs of H. antonii laid on neem were exposed for natural parasitism, neem has not exerted any adverse interaction on Telenomus sp.

Keywords

Egg Parasitoids, Helopeltis antonii.

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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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S. Parameswaran ¹, P. C. Sundara Babu ¹, M. Shanthi ¹, S. Jayaraj ¹

Affiliations
1 Department of Agrl. Entomology, Tamil Nadu Agricultural University, Coimbatore - 641003, IN

Abstract

A field experiment was conducted during 1991-92 crop season at Sathiamangalam, Periyar district, Tamil Nadu, on the control of sugarcane shoot borer, Chilo infuscateiius using granulosis virus (GV) and cultural methods of control. The shoot borer infestation was significantly less in plots treated with GV and plots treated with GV+ cultural practices, than in control. Application of GV at 10⁷ inclusion bodies/ml on 35 and 50 days after planting significantly reduced the shoot borer infestation compared to other treatments. All the treatments gave increased cane yieldover control. The GV treatment alone resulted in a cost benefit ratio of 1:2.54 whereas it was 1:2047 for trash muiching, 1:2.46 for GV application and 1:2.43 for GV+ earthing up.

Keywords

Chilo infuscatellus, Control, Granulosis Virus, Cultural Practices.

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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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S. Parameswaran ¹, P. C. Sundara Babu ¹, P. J. Suresh ¹, S. Jayaraj ¹

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

Abstract

The Sugarcane shoot borer, Chilo infuscatellus Snell. a key pest of sugarcane enjoys a wide distribution in the sugarcane growing areas of India (Avasthy and Tiwari, 1986) and accounts for significant loss in cane yield and sugar recovery (Patil and Hapase, 1981). A granulosis virus (GV) reported from C. infuscatellus (Easwaramoorthy and David, 1979) and was found to be highly pathogenic to C. infuscatellus in laboratory studies (Easwaramoorthy, 1984). Application of GV at 10⁹ and 10⁷ inclusion boidies (IB)/ml and carbofuran at 1 and 2 Kg a.i./ha reduced the shoot borer incidence (Easwaramoorthy and Santhalakshmi, 1988). Present studies were carried out to study the efficacy of GV in comparaison and in alternation with insecticides.

Keywords

Sugarcane Shoot Borer, Chilo infuscatellus, Control, Granulosis Virus.

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