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Mahadevan, N. R.
- Efficacy of Trichogramma chilonis Ishii in Combination with Biopesticides against Helicoverpa armigera (Hubner) in Rainfed Cotton Ecosystem
Abstract Views :248 |
PDF Views:138
Authors
Affiliations
1 Department of Agricultural Entomology, Tamil Nadu Agricultural University, Coimbatore 641 003, Tamil Nadu, IN
2 Department of Agricultural Entomology, Agricultural College and Research Institute (TNAU), Madurai 625 104, Tamil Nadu, IN
1 Department of Agricultural Entomology, Tamil Nadu Agricultural University, Coimbatore 641 003, Tamil Nadu, IN
2 Department of Agricultural Entomology, Agricultural College and Research Institute (TNAU), Madurai 625 104, Tamil Nadu, IN
Source
Journal of Biological Control, Vol 18, No 2 (2004), Pagination: 121-128Abstract
A study was undertaken to observe the combined effects of Trichogramma chilonis with some biopesticides viz., HaNPV, Bacillus thuringiensis var. kurstaki (HaIt WP) and Beauveria bassiana (Bev Bas). Two releases of T. chilonis with two sprays of B.t.k. recorded less mean larval popUlation (O.33/plant). less damage on shed squares (42.78%), intact squares (9.12%), bolls (14.20%) and loculi (10.68%) and recorded higher yield (782 kg/ha). Two releases of T. chilonis with two sprays of HaNPV was the next best treatment regarding less mean larval popUlation and damage on fruiting parts. Application of B. bassiana alone and in conjunction with T. chilonis proved less effective compared to other treatments. Two releases of T. chilonis with one spray of B.t.k or HaNPV and T. chilonis alone performed moderately in reducing the larval population and damage on fruiting parts.Keywords
Biopesticides, Efficacy, Helicoverpa armigera, Trichogramma chilonis.- Field Efficacy of Chrysoperza carnea (Stephens) in Combination with Biopesticides against Helicoverpa armigera(Hubner) on Cotton under Rainfed Condition
Abstract Views :215 |
PDF Views:102
Authors
Affiliations
1 Department of Agricultural Entomology, Tamil Nadu Agricultural University, Coimbatore-641 003, Tamil Nadu, IN
2 Department of Agricultural Entomology, Agricultural College and Research Institute (TNAU), Madurai 625 104, Tamil Nadu, IN
1 Department of Agricultural Entomology, Tamil Nadu Agricultural University, Coimbatore-641 003, Tamil Nadu, IN
2 Department of Agricultural Entomology, Agricultural College and Research Institute (TNAU), Madurai 625 104, Tamil Nadu, IN
Source
Journal of Biological Control, Vol 18, No 2 (2004), Pagination: 147-153Abstract
The present investigation was carried out to study the field efficacy of Chrysoperla carnea (Stephens) in combination with biopesticides against Helicoverpa armigera (Hiibner). The lowest mean larval population of H. armigera, minimum damage on shed squares, squares (intact), bolls and loculi and higher yield were recorded in two releases of C. carnea and two sprays of Bacillus thuringiensis var. kurstaki (B.t.k.) treated plots followed by C. cornea in conjunction with HaNPV and B.t.k alone treated plots. The field recovery of C. cornea, HaNPV infected, Bacillus thuringiensis var. kurstaki infected and Beauveria bassiana mycosed larvae was more in their respective alone treated plots. The incremental cost benefit ratio was obtained maximum in chlorpyriphos 20 EC alone (1: 3.66) followed by HaNPV alone (1: 3.S(), two releases of C. carnea with two sprays of HaNPV (1: 2.88) and two releases of C. carnea with one spray of HaNPV (1: 2.48).Keywords
Biopeslicides, Chrysoperia carnea, Cotton, Helicoverpa armigera, ICBR.- Influence of Intercropping on the Conservation of Chrysoperla carnea (Stephens) in Cotton
Abstract Views :188 |
PDF Views:111
Authors
Affiliations
1 Department of Agricultural Entomology, Agricultural College and Research Institute (TNAU), Madurai 625 104, Tamil Nadu, IN
1 Department of Agricultural Entomology, Agricultural College and Research Institute (TNAU), Madurai 625 104, Tamil Nadu, IN
Source
Journal of Biological Control, Vol 13, No 1&2 (1999), Pagination: 111-114Abstract
Among six intercrops evaluated, cotton (Gossypium hirsutum L.) intercropped with sunflower and cowpea in paired row system were favourable for the conservation of Chrysoperla carnea (Stephens), Cotton alone was comparatively less favourable to the multiplication of C. carnea, which correspondingly recorded more population of insect pests. The population of C. carnea did not show any influence on the population of Amrasca devastans Ishida.Keywords
Chrysoperla carnea, Helicoverpa armigera, Intercropping System, Sucking Pests.- Optical Brighteners as UV Protectants and their Influence on the Virulence of Nuclear Polyhedrosis Virus of Spodoptera litura (Fabricius) (Lepidoptera: Noctuidae)
Abstract Views :247 |
PDF Views:122
Authors
Affiliations
1 Department of Agricultural Entomology, Agricultural College and Research Institute, Madurai 625 104, Tamil Nadu, IN
1 Department of Agricultural Entomology, Agricultural College and Research Institute, Madurai 625 104, Tamil Nadu, IN
Source
Journal of Biological Control, Vol 11, No 1&2 (1997), Pagination: 17-22Abstract
Laboratory screening of twelve optical brighteners as UV protectants for Spodoptera litura (Fabricius) NPV revealed that Ranipal BVN and 2B provided excellent protection (80% original activity remaining). Effect of optical brighteners in preserving NPV was concentration dependent and an increase in concentration from 0.001 to 1.00 per cent increased the retention of viral activity from 14.8 to 99.9 per cent and 10.8 to 99.9 per cent for Ranipal BVN and 2B, respectively. Addition of selected optical brighteners, Ranipal BVN and 2B at a range of 0.001 to 1.00 per cent with S. litura NPVincreased the virulence ofNPV by reducing the LC50 and LT50 of NPV.Keywords
LC50, LT50, Optical Brighteners, Original Activity Remaining, Spodoptera litura NPV.- Effect of Host Plants on the Infectivity and Yield of Nuclear Polyhedrosis Virus on Spodoptera litura (Fabricius)
Abstract Views :203 |
PDF Views:132
Authors
Affiliations
1 Agricultural College and Research Institute, Tamil Nadu Agricultural University, Madurai 625 104, Tamil Nadu, IN
1 Agricultural College and Research Institute, Tamil Nadu Agricultural University, Madurai 625 104, Tamil Nadu, IN