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|Title:||Studies on the biology and population dynamics of rice whitebacked planthopper, sogatella furcifera (Horvath) on rice|
|Agrotags:||Biology, Population dynamics, Whitebacked planthopper, Spider, Mirid bug, Biotic, Abiotic factors|
|Abstract:||Studies on biology and population dynamics of whitebacked planthopper (WBPH) were carried out in the screen house and field at CCS Haryana Agricultural University, rice research station, Kaul (Kaithal) during Kharif 2011 and 2012. The eggs were laid in cluster of 5-30 eggs. The maximum (71.96%) eggs were laid in leaf sheath of plant followed by midrib (16.66%) and stem (11.36%). The eggs hatched in 5-9 days with an average of 8.6±0.24 days. The hatchability was 84.21 per cent. Nymph passed through five instars to became an adult. Mean duration of 1st, 2nd, 3rd, 4th, and 5th instars were 2.05±0.05, 2.30±0.12, 2.60±0.11, 2.70±0.10 and 2.95±0.11 days with a range 2-3, 2-4, 2-3, 2-3 and 2-4 days, respectively. The total nymphal period was 12.6 days (range 11-14 days). On an average 89 per cent nymphs survived and became adult. The sex ratio was 1.0:0.78 (male:female). The pre-oviposition, ovipostion and post- ovipostion periods were 3.7±0.30 (2-5), 10.2±0.51 (9-13) and 2.0±0.29 (1-4) days, respectively. Longevity of males and females ranged from 11-16 (mean 14.4) and 12-19 (mean 15.9) days, respectively. On an average a female laid 132.8 (119-158) eggs during its life span. The population of WBPH was maximum during 38th SMW (4th week of September) during 2011 and 2012. A spider Lycosa spp. and mirid Cyrtorhinus lividipennis preyed on the eggs, nymphs and adults of WBPH. When WBPH population was correlated with biotic and abiotic factors, the relationship was found to be non significant.|
|Appears in Collections:||M. Sc. Dissertations|
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