Studies on population dynamics and management of pod fly (Melanagromyza obtusa) and pod borer (Helicoverpa armigera) on pigeonpea
| dc.contributor.advisor | Singh, P.P. | |
| dc.contributor.author | Patel, Yogesh Kumar | |
| dc.date.accessioned | 2023-01-06T09:41:46Z | |
| dc.date.available | 2023-01-06T09:41:46Z | |
| dc.date.issued | 2022 | |
| dc.description.abstract | The research entitled “Studies on population dynamics and management of pod fly (Melanagromyza obtusa) and pod borer (Helicoverpa armigera) on pigeonpea” was carried out under field conditions at research farm of T.C.A., Dholi (Muzaffarpur) during Kharif season 2021-2022. The maximum population of M. obtusa maggots and pupae (12.77 maggot and 14.63 pupae/50 pods) on pigeonpea variety Rajendra Arhar-1 was recorded during 11th and 12th SMW, respectively while maximum larval population of H. armigera (6.17 larvae/5plants) was recorded on 11th SMW. Maximum activity of natural enemies was recorded on 11th SMW during observation period. The M. obtusa maggot’s population showed non-significant positive correlationwith the maximum and minimum temperature, morning relative humidity and rainfall showed non-significant negative correlation, while evening relative humidity showed significant negative correlation. The correlation analysis between M. obtusa pupae and abiotic factors showed that only rainfall had non-significant negative correlation and maximum and minimum temperature showed significant positive correlation, while morning and evening relative humidity were found to have negative but significant correlation. The larval population of H. armigera showed non-significant positive correlation with maximum and minimum temperature while morning relative humidity and rainfall had a non-significant negative correlation. Whereas, evening relative humidity was found significant negative correlation. Among 16 pigeonpea genotypes screened against the pod fly, no single genotypes were found highly resistant and 2 genotypes, i.e., DA 15-1 and DA 16-1, were reported as moderately resistant while 8 genotypes BRA 301, Pusa 153, BRA 302, Pusa 171, Pusa 172, DA 17-1, DA 19-1 and DA 18-1 were identified as Intermediate resistant. Four genotypes viz; BRA 303, Pusa 181, Pusa 182 and DA 18-2 were identified susceptible as against Rajendra Arhar-1 and Bahar used as moderately tolerant and susceptible. The pod damage per cent due to M. obtusa and H. armigera on different genotypes was varied significantly. Among all 16 genotypes the maximum pod damage was recorded in DA 18-2 (66.67% and 35.33%), while the lowest pod damage was observed in pigeonpea genotype DA 16-1 (26.67% and 21.33%) as against Rajendra Arhar-1 (35.33% and 22.67%) used as moderately tolerant check and Bahar (61.33% and 32.67%) used as susceptible check due to M. obtusa and H. armigera, respectively under the natural conditions. Among all 16 genotypes maximum seed damage was recorded in DA 18-2 (33.61% and 21.41%), while the lowest seed damage were observed in the genotypes DA 16-1 (17.25% and 13.96%) as against Rajendra Arhar-1 (22.31% and 15.16%) used as moderately tolerant check and Bahar (32.67% and 20.04%) used as susceptible check, respectively. Nine treatments including six synthetic and two botanical insecticides applied twice at 50% flowering and 50% podding stage stage were tested for their field efficacy against the M. obtusa and H. armigera. All the treatments are found significantly superior over untreated control. Among all the treatments flubendiamide (480 SC) @ 30 g a.i./ha was found most effective in controlling pod fly and gram pod borer incidence with less pod and grain damage and maximum yield (10.67% pod damage, 6.31% grain damage and 1740 kg/ha) which was at par with indoxacarb (15.8% EC) @ 50 g a.i./ha. (12.67% pod damage, 7.62% grain damage and 1545 kg/ha) as against control (35.67% pod damage, 20.54% grain damage and 748 kg/ha). On the basis of economic parameters highest incremental benefit-cost ratio (14.51:1) was obtained by indoxacarb followed by buprofezin (10.38:1), thiamethaxon (9.98:1), profenofos (7.43:1), flubendiamide (6.94:1), fipronil (6.48:1), NSKE (4.79:1) and the treatment of YBSE was found lowest incremental benefit-cost ratio (1.16:1). | en_US |
| dc.identifier.other | M/ENTO/077/2020-21 | |
| dc.identifier.uri | https://krishikosh.egranth.ac.in/handle/1/5810191368 | |
| dc.keywords | Population dynamics, Pod fly, Melanagromyza obtusa, Pod borer, Helicoverpa armigera, Pigeonpea, Entomology. | en_US |
| dc.language.iso | English | en_US |
| dc.pages | 94 p. + BIBLIOGRAPHY (i-x) + APPENDIX (I) | en_US |
| dc.publisher | DRPCAU, PUSA | en_US |
| dc.sub | Entomology | en_US |
| dc.theme | Studies on population dynamics and management of pod fly (Melanagromyza obtusa) and pod borer (Helicoverpa armigera) on pigeonpea | en_US |
| dc.these.type | M.Sc | en_US |
| dc.title | Studies on population dynamics and management of pod fly (Melanagromyza obtusa) and pod borer (Helicoverpa armigera) on pigeonpea | en_US |
| dc.type | Thesis | en_US |