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EVALUATION OF DIFFERENT MANAGEMENT TACTICS AGAINST BPH, Nilaparvata lugens (Stal) (Hemiptera: Delphacidae) IN RICE

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Title EVALUATION OF DIFFERENT MANAGEMENT TACTICS AGAINST BPH, Nilaparvata lugens (Stal) (Hemiptera: Delphacidae) IN RICE
 
Creator BOBBITI NAGENDRA REDDY
 
Contributor UMA MAHESWARI, T
 
Subject fungi, biological phenomena, rice, biological development, animal developmental stages, insecticides, planting, humus, concentrates, chitin synthesis inhibitors
 
Description Six hundred and twenty NSN-2 entries were screened for their reaction to brown planthopper, BPH, Nilaparvata lugens (Stal) by using standard seed box technique using TN1 as susceptible check, Ptb 33 as resistant check during 2013-14 at Indian Institute of Rice Research (IIRR), Hyderabad. Among 620 entries, four entries viz., IET No. 23620, IET No. 23660, IET No. 23739 and IET No. 23771were found to be resistant with a damage score of 1.1-3.0 and 10 entries as moderately resistant with a damage score of 3.1-5.0. Remaining entries were found to be susceptible with a damage score of >5. On the selected resistant entries exhibited less number of BPH nymphs settled per plant (1.0- 1.3 nymphs/ plant), more number of probing marks ranging between 22.3–30.8, excretion of less amount of honeydew (26.3- 46.3 mm2) and exhibited low fecundity (22.0-53.0 eggs/ pair), indicating the non-suitability of the entries for feeding and oviposition by brown planthopper. The selected entries also exhibited low hatching (41.9- 48.5%), prolonged nymphal duration (12.7-15.9 days), low nymphal survival (25.0- 48.3%) and more number of days (49.0 days) for wilting compared to susceptible entries. The identified resistant entries can be used in the breeding programmes to develop BPH resistant varieties
Monitoring of insecticide resistance in BPH collected from West Godavari district, Andhra Pradesh, India was carried out during 2013-14 and 2014-15, indicated that BPH populations from West Godavari acquired very high level of resistance to buprofezin 25 SC (1318.0-1662.4 fold) in both the years. West Godavari BPH also acquired resistance to neonicotinoids like imidacloprid 17.8 SL (108.5-517.9 fold) and thiamethoxam 25 SG (39.7-103.5 fold) similarly to glamore 80 WG (ethiprole 40%+ imidacloprid40% WG) (40.51-101.84 fold) during both the years and to ethiprole 100SC (51.74- 96.35 fold) during 2014-15 indicating their acquired insecticide
resistance was from moderate to high level of resistance to these insecticides. The population has developed low level of resistance to dinotefuron 20SG (1.13-3.83 fold) and OP compounds like monocrotophos 36 SL, dichlorvos 76 EC and acephate 75 WP (1.12-2.82 fold).
Efficacy of entomopathogenic fungi (B. bassiana, M. anisopliae and L. lecanii) against BPH was tested under glasshouse conditions, revealed that the three tested fungi caused mortality to an extent of 53.75 – 70.00 per cent at 10 days after application.
Compatibility between insecticides and entomopathogenic fungi studies were conducted under laboratory conditions in Plant Pathology, IIRR indicating all the tested insecticides affected the radial growth of fungi partially at all the three concentrations (0.5RC, RC and 1.5RC). At recommended concentrations Imidacloprid 17.8 SL, ethiprole 40%+Imidacloprid 40% WG (glamore 80 WG), monocrotophos 36 SL and buprofezin 25 SC found harmless to all the three tested fungi (
 
Date 2017-01-03T10:53:44Z
2017-01-03T10:53:44Z
2016
 
Type Thesis
 
Identifier http://krishikosh.egranth.ac.in/handle/1/94091
 
Language en
 
Relation D10030;
 
Format application/pdf
 
Publisher PROFESSOR JAYASHANKAR TELANGANA STATE AGRICULTURAL UNIVERSITY. HYDERABAD