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Vinothkumar, B.
- Diversity of Coccinellid Predators in Upland Rainfed Rice Ecosystem
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PDF Views:162
Authors
Affiliations
1 Hybrid Rice Evaluation Centre, Tamil Nadu Agricultural University, Gudalur, The Nilgiris, Tamil Nadu, IN
1 Hybrid Rice Evaluation Centre, Tamil Nadu Agricultural University, Gudalur, The Nilgiris, Tamil Nadu, IN
Source
Journal of Biological Control, Vol 27, No 3 (2013), Pagination: 184–189Abstract
The diversity of coccinellids and impact of pest population on coccinellids density has been studied in the upland rainfed rice agroecosystem in Bharathy variety cultivated in different rice establishment techniques at Hybrid Rice Evaluation Centre, Tamil Nadu Agricultural University, Gudalur. The Nilgiris for three years during Kharif 2010 to Kharif 2012. Three aspects, population of coccinellids and pests in different rice establishment techniques, diversity of coccinellids species in different rice establishment techniques and impact of pest density on the population of coccinellids were studied. A total of 13 species of coccinellids were observed from four different treatments of upland rice crop at different days after transplantation. Among the coccinellids, Cheilomenas sexmaculatus, Coccinella transversalis, B rumoides suturalis, Harmonia octomaculata and Microspia discolour were predominant during crop season and they have significant positive correlation with the population of brown plant hopper and green leaf hopper. Regression analysis revealed that 71 percent of C. sexmaculatua, 89 percent of C. transversalis, 62 percent of B. suturalis, 79 percent of H. octomaculata and 75 percent of M. discolour population depends on the incidence of BPH and GLH in the upland rainfed rice ecosystem. Diversity indices revealed that diversity of coccinellids was more in the direct sown without weeding operation method than other methods.Keywords
Biodiversity, Coccinellids, Upland Rice, Rainfed Rice, Diversity Indices.Full Text
References
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- Diversity of Spider Fauna in Upland Rice Agroecosystem at Gudalur Valley in Tamilnadu
Abstract Views :276 |
PDF Views:136
Authors
Affiliations
1 Hybrid Rice Evaluation Centre, Tamil Nadu Agricultural University, Gudalur 625 518, Tamilnadu, IN
1 Hybrid Rice Evaluation Centre, Tamil Nadu Agricultural University, Gudalur 625 518, Tamilnadu, IN
Source
Journal of Biological Control, Vol 26, No 3 (2012), Pagination: 222–229Abstract
The diversity of spiders and impact of pest population on spider density has been studied in the upland rice agroecosystem in Bharathy variety at Hybrid Rice Evaluation Centre, Tamil Nadu Agricultural University, Gudalur, The Nilgiris during Kharif 2010 and 2011. Three aspects, population of spiders and pests in different rice establishment techniques, diversity of spider species in different rice establishment techniques and impact of pest density on the population of spiders were studied. A total of 11 species of spider from 7 different families were observed from all the three different techniques of upland rice crop at different days after transplantation. Among the spider species, Lycosa pseudoannulata was higher in early growth stage and Tetragnatha javana was predominant in later stages of the crop. Population of brown plant hopper, green leaf hopper and stem borer showed significant positive impact on L. pseudoannulata and Oxyopes javanus population. Regression analysis revealed that 97 percent of L. pseudoannulata, 72 percent of O. javanus, 94 percent of T. javana and 80 percent of Clubiona sp. population depends on the incidence of pests in the upland rice ecosystem. Diversity indices revealed that diversity of spider was more in the direct sown method than transplanting and seedling throwing method.Keywords
Biodiversity, Spiders, Upland Rice, Diversity Indices, Lycosa pseudoannulata.Full Text
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