Screening of pigeonpea [Cajanus cajan (L.) Millsp.] genotypes against pod pest complex
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Date
2020
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Department of Entomology Institute of Agricultural Sciences Banaras Hindu University Varanasi
Abstract
The pigeonpea was infested with the number of insect pests at various stage of crop growth. Out of which the incidence pattern of M. obtusa, C. gibbosa, H. armigera, L. boeticus and E. atomosa was studied. The result of the investigation pertaining to the “Screening of pigeonpea [Cajanus cajan (L.) Millsp.] genotypes against pod pest complex” was carried out in 2018-19 at the Agricultural Research Form, Institute of Agricultural Sciences, Banaras Hindu University, Varanasi. These insects were studied during reproductive phase of the crop during 2018-19 the first incidence of pod fly, M. obtusa was observed in all genotypes during the 4th standard week of 2018-19. The various peak of the pod fly population was reported in different genotypes from the 6th standard week to the 11th standard week. The peak population of maggots was observed in the 11th standard week in the genotype MAL- 13 (AVT1), AVT1-704, AVT1-706 and AVT1-709 with population of (2.61 maggots/plant), (2.42 maggots/plant) and (2.40 maggots/plant), respectively. During the 4th standard week of 2018-19 the first occurrence in the MAL- 13 (AVT1) genotype of pod bug was also observed in all genotypes with a cumulative population of (1.13bug / plant) in the 4th standard week followed by AVT1-706 (1.06bug / plant), AVT1-705, (1.03bug / plant) during the first week. Pod bug populations have continued in the genotype from Standard 4th to Standard 12 Week 2018-19. Pod bug populations during the 12th standard week were reported to be the highest in nearly all genotypes. The pooled mean population of gram pod borer was recorded highest in the genotype MAL-13 (AVT1) (check) (0.92 larva/plant) lowest in AVT1-707 (0.41 larva/plant).
L. boticus was observed at 4th standard week with the first occurrence of blue butterfly. Population significantly differentiated among the genotypes screened in the genotype AVT1-707 with a maximum population of (0.14 larva/plant) followed by MAL-13 (AVT1) AVT1-704 & AVT2-903 AVT1-7017 & AVT2-906, AVT1-706, MAL-13 (AVT2) and AVT1-702 & AVT2-904 with population (0.04 larva/plant) in the first week. Pod damages were primarily caused by pod fly, pod bug and gram pod borer in the long duration genotype of pigeonpea. The damage ranged from 27.33 percent to 51.00 percent for pod fly, from 12.00 to 23.00 percent for pod bug and from 3.67 to 7.67 percent for gram pod borer in damage seen in all 18 genotypes in 2018-19 respectively. The damage caused to the grain by the genotype for long-duration pigeonpea has been primarily attributed to pod fly, pod bug and gram pod borer. This ranged from 12.68% to 30.52% for pod fly, 4.71% to 8.93% for pod bug and 0.79% to 3.80% for gram pod borer. Among the 18 genotypes that were screened, AVT1-707 and AVT1-704 followed by AVT1-709 and AVT2-902 the resistance and tolerence with pod fly, pod bug and pod borer damage has been observed, as well as the grain yield has been maximum.
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Pigeonpea