RESPONSE OF PIGEONPEA GENOTYPES AGAINST PIGEONPEA LEAF WEBBER, GRAPHOLITA CRITICA (MEYR.) (LEPIDOPTERA: TORTRICIDAE (original) (raw)
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Fifty three pigeon pea genotypes were screened against leaf webbber, G. critica of which 11 genotypes were from Multilocation trial Medium duration (MLT-MD), 18 genotypes from All India Crop Improvement Project (AICRP) trials and 24 genotypes from International Crops Research Institute for Semi-arid Tropics (ICRISAT) trials. Under MLT-MD trials the variety Asha and TS 3R C4 (2.67 webs/ 5 plants) recorded the lowest number of webs. In AICRP trials the lowest number of webs per five plants was observed in RVSA 81 (1.33 webs/ 5 plants), Rajeev lochan, P-703 (2.00 webs/ 5 plants), RVSA 34, RVSA 64, WRG 157 and WRG 98 (2.33 webs/ 5 plants). The leaf webbber population in genotypes under ICRISAT trials ranged from 2.33 webs / 5 plants in ICPHRL 4979-7 to 4.67 webs / 5 plants in ICPHRL 4985-1 and ICP-7035.
Studies on the nature of damage and biology of leaf webber, Grapholita critica (Meyr.) (Lepidoptera: Tortricidae) on pigeonpea was conducted at the University of Agricultural Sciences, Raichur, Karnataka. The results revealed that first instar larva formed a web of 6.3 x 1.2 mm by folding a leaf and scarified the lamina, culminating a whitish patch. Larva folded the leaf lamina from midrib. The 3 rd and 4 th instar larva webbed 6 to 8 leaves and started feeding lamina inside the webs. The fecundity ranged from 22 to 85 eggs with an average of 55.80±15.65 eggs per female. The average incubation, larval and pupal periods were 3.12, 18.35 and 5.43 days, respectively. The total life cycle of G. critica from egg to adult male under laboratory condition ranged from 33.76 to 38.25 days with a mean of 35.96 ± 1.71 days. The total life cycle from egg to adult female ranged from 35.08 to 39.76 days under laboratory condition with a mean of 37.38 ± 1.79 days.
International Journal of Current Microbiology and Applied Sciences, 2017
grown in areas with less than 650 mm annual rainfall also. Pigeon peas are frequently interplanted with other short term crops, including cereals and other grain legumes, for higher productivity per unit land area and reduced risks associated with some crop failures (Madang A. Dasbak et al., 2012). Due to the above reasons, pigeonpea is cultivated in various parts of the country. Among the various constraints limiting the production of pigeonpea, insect pests are the
Ten promising short duration genotypes of pigeonpea were screened under field conditions for two years (2013-15) to identify sources of resistance against pod borers. On the basis of per cent pod damage and Pest Susceptibility Rating (PSR) index, genotypes PUSA-2012-1, PA 409, PA 406, AL1747 were found to be least susceptible (PSR= 4 to 5) while two genotypes, AL 1790 and AL 1770 were ascertained highly susceptible against pod borers having damage rating of 8 over the susceptible check cultivar (Manak). Phenol and flavonoid content present in the pod wall of all the test genotypes/cultivars were also estimated. Highest phenol and flavonoid content was recorded from PUSA-2012-1 while the lowest content was obtained from the genotype AL 1790. Correlation studies made with these biochemical constituents revealed a significant and negative association of pod damage (%) with phenol (r =-0.896**) and flavonoid (r =-0.872**) content in pod walls. Thus the genotypes having higher content of phenols and flavonoids in their pod walls offered resistance against pod borer complex.
International Journal of Plant and Environment, 2021
The present study was conducted at the College of Agriculture Raipur, IGKVV, and Chhattisgarh. The experimental materials used 103 local landraces of pigeonpea, including three popular standard checks during Kharif 2019-20 in an augmented RBD Design for 15 qualitative and 20 qualitative characters observations recorded and analysis of variance for showed differences for different characters. High magnitude of the coefficient of variation GCV % and PC V% (more than 20 %) in some genotypes was observed for Duration of flowering (20.96, 21.41), Harvest Index (22.21, 22.82), Maruca vitrata larvae population (22.58, 22.77), No of Secondary branches (23.17, 23.33) while shelling percentages are low 8.64 and 9.11, respectively, rest all traits are in a medium value. Result of major pigeonpea insect's incidence 103 genotypes tested against different insect pests, 10 genotypes recorded most promising entries against key pest and 10 genotypes were recorded most susceptible entries against insect pest. A high coefficient of variation in the entire genotypes was observed for some traits.
– Field trial was conducted to study the impact of weather parameters on the population build up of leaf webber, Grapholita critica (Meyr.) (Lepidoptera: Tortricidae) on pigeonpea. The number of webs per 50 plants was in the range of 1.34 to 25.65 in the month of August. In the month of September the number of webs per 50 plants ranged from 5.23 to 36.56. Whereas, in October the number of webs per 50 plants ranged from 1.22 to 12.35. Leaf webber damage exerted a negative association with maximum temperature (r =-0.31), minimum temperature (r =-0.05) and positive association with morning relative humidity (r= 0.22), afternoon relative humidity (r = 0.21) and rainfall (r = 0.03). However, only the influence of mean maximum temperature with leaf webber damage was found to be significant. But, the influence of minimum temperature, morning relative humidity, afternoon relative humidity and rainfall with leaf webber damage was not significant.
Legume Research An International Journal, 2019
The present study intends to screen 52 pigeonpea genotypes for bruchid infestation under controlled conditions using nochoice assay. The results revealed significant differences among the genotypes considering parameters like growth index (GI), egg numbers and adult emergence. The genotypes viz., ICP 89049, IPA 37 and Dholi dwarf DB had low average values for GI (0.45, 0.48 and 0.48 respectively), number of eggs after 20 days (14.5, 21.5 and 28), and adults emerged after 30 days of oviposition (9.0, 7.0 and 4.5, respectively) when compared to the genotypes Asha (higher GI: 1.10), and IPA 7-6 (having 98.0 eggs after 20 days of incubation). Concerning associations among different traits, the GI had significant positive correlations with number of eggs laid (0.484), and number of adults emerged at 15-30 days (0.638). The GI showed a negative relationship with proportion of seed coat (-0.162) and seed hardness (-0.197). The traits that are less preferred by the bruchids include hard seed with less seed diameter and high proportion of seed coat. The tolerant genotypes viz. ICP 89049, IPA 37 and Dholi dwarf DB identified here could be deployed in breeding programs for reducing post harvest losses in pigeonpea.
2016
Twenty-five long duration pigeonpea genotypes were screened for the reaction against pod bug and gram pod borer during Kharif season of 2014-15 at the Agricultural Research Farm, Institute of Agricultural Sciences, Banaras Hindu University, Varanasi. The first incidence of pod bug, Clavigralla gibbosa (Spinola) was observed in 4th standard week and continued to 12th standard week in all genotypes The population of pod bug was found to be highest in genotype Bahar (check) and ICP 7035-1 in 11th standard week with population of 10.3 bugs/plant and 10.2 bugs/plant, respectively. The mean population of pod bug was recorded highest in genotypes Bahar (check) and ICP 7035-1 i.e. (6.8 bugs /plant) and lowest in genotype ICP 13212-1 (3.0 bugs/plant). The first incidence of pod borer, Helicoverpa armigera (Hubner) larvae was observed in 4th standard week in fifteen genotypes out of the total twenty-five genotypes. The mean population of pod borer was recorded highest in genotype ICP 13198-1 ...
Legume Research - An International Journal, 2015
Pigeonpea [Cajanus cajan (L.) Millsp.] is an important legume crop of southern Maharashtra, providing high quality protein and animal feed. Insect pests feeding on flowers and pods of this crop are the most important biotic constraint affecting yield to the tune of 60 per cent. Hitherto, focus of pest management research has been on podborer, Helicoverpa armigera (Hubner). With large scale cultivation of transgenic cotton in Maharashtra and climatic changes, pest scenario has changed requiring more attention on leaf webber, Maruca and pod fly. Hence, area wide implementation of Integrated Pest Management (IPM) in pigeopea was implemented during 2010-11 and 2011-12 covering 5 taluks benefitting 2449 farmers of 8 villages. It was observed that use of pesticides based on the "e-Pest monitoring and its subsequent decision support tools" enabled to manage pests with judicious use of pesticides. The pest infestation (pod borer, pod fly, plume moth, flower webber, etc.,) were significantly low as compared to non-IPM with appreciable high population of natural enemies (coccinellids, chrysopa and spiders) were also observed under IPM fields. Timely dissemination of advisories and action has resulted in higher grain yield of 9.89 q/ha and lower grain damage 5.69 per cent as compared to non-IPM (13.79 per cent).