STUDIES ON BIOLOGY AND SEASONAL INCIDENCE OF RICE PLANTHOPPERS IN TUNGA-BHADHRA PROJECT (TBP) AREAS OF KARNATAKA
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Date
2018-07-30
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UNIVERSITY OF AGRICULTURAL SCIENCES RAICHUR - 584 104
Abstract
Investigations were carried out on the occurrence of morpho-species of brown planthopper(BPH), their biology and seasonal incidence in the Tunga-Bhadra Project areas of Karnataka (ARS, Gangavathi, Kesaratti, ARS, Dhadesugur and farmer’s field in Dhadesugur) during June 2017 to May 2018. It was found that the existence of two different morphs in the rice ecosystem and were studied for morphometric and genital variability. In morpho-species study there were no such variations in morphometrics including genital structures. These are just mere colour variants of brown planthopper (BPH), Nilaparvata lugens (Stal) and are not different species or subspecies in all the locations. In biological studies of brown and black morphs of BPH, brown morph showed ovipositional period (14.5-19 days), fecundity (140-170 days), incubation period (7-9 days), nymphal period (13.5-18 days) adult female and male longevity (20-23 and 17-19 days). The black morphs also showed the similar biological parameters as that of brown morph. So, there were no such variations in the biological parameters of both the morphs. The incidence of white backed planthopper (WBPH) and BPH was observed during kharif and rabi-summer season. The population of WBPH attacks the paddy at initial stage of the crop and reached maximum during 40-45 DAT with a population of 0.34, 0.76, 0.36, 0.52 per hill in ARS, Gangavathi, Kesaratti, ARS, Dhadesugur and farmer’s field in Dhadesugur. The BPH population started appearing during later stages of the crop and reached maximum at 75-85 DAT with a maximum population of 4.46, 26.4, 3.4, 24.8 per hill in ARS, Gangavathi, Kesaratti, ARS, Dhadesugur and farmer’s field in Dhadesugur during last week of December during kharif. In rabi-summer WBPH population was negligible but BPH population reached a maximum population of 0.84, 2.76, 3.78, 4.62 per hill during last week of February (45-50 DAT).
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