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Papers by Dr. NC Venkateswarlu

Research paper thumbnail of Nomuraea rileyi (Farlow) Samson Incidence on Spodoptera litura and Spodoptera frugiperda in Andhra Pradesh

International Journal of Current Microbiology and Applied Sciences, 2021

Research paper thumbnail of Evaluation of Blackgram Genotypes for Resistance Against Thrips and Whitefly in Relation to Leaf Curl and Yellow Mosaic Virus

A field experiment was conducted to screen the blackgram genotypes at dry land farm, S.V. Agricul... more A field experiment was conducted to screen the blackgram genotypes at dry land farm, S.V. Agricultural College,Tirupati during rabi2018-19 for identification of resistance source for utilization in developing the resistant varieties of blackgram. Total 20 genotypes along with two susceptible checks viz., TBG-140 and LBG-645 were screed for Leaf Curl and Yellow Mosaic Virus (YMV). The results revealed that PU-31 genotype recorded lowest incidence of leaf curl followed by GBG-1 and found resistant with 1 scale rating. Sixteen genotypes viz., NDUK-15-222, SRI, IPU-2-43, TBG-130, TBG-104-1, TBG-129, Butta Minumu, OBG-32, KPU-12-213, Tuti Minumu, VBG 12-111-1, LBG-787, GKB-3, LBG-623 and LBG-685 were recorded to be moderately resistant with 2 scale rating. Whereas TU-40 and LBG-752 genotypes are found to be moderately susceptible with 3 scale rating. The genotype LBG-20 found susceptible with 4 scale rating followed by two susceptible checks viz., TBG-104 and LBG-645. In case of YMV amon...

Research paper thumbnail of Influence of castor genotypes with different wax blooms on oviposition preference of endolarval parasitoid Snellenius maculipennis ( Szepligate ) of castor semilooper Achaea janata L

The A. janata larvae reared on susceptible genotype DPC-9 had significantly greater parasitisatio... more The A. janata larvae reared on susceptible genotype DPC-9 had significantly greater parasitisation by S. maculipennis than the moderately resistant genotype 48-1 and resistant genotype GCH-4 tested under nochoice, dual-choice and multi-choice conditions, suggesting that host genotypes plays a significant role in the effectiveness of S. maculipennis in parasitisation of A. janata larvae. The increased parasitism of A. janata larvae by S. maculipennis on the susceptible genotype DPC-9 might be due to the fact that the host larvae was healthy on the susceptible genotype because lack of resistance to the herbivore. Percentage parasitism was greater under no-choice condition as compared to that under multi-choice and dual choice conditions, which may be largely because of non-availability of alternate host plant to the females of S. maculipennis in no choice condition. The genotype DPC-9 was hospitable to S. maculipennis, better suited for use in integrated pest management to minimize th...

Research paper thumbnail of First Report of Tobacco streak virus Infecting Guizotia abyssinica from India

Plant Disease, 2007

Guizotia abyssinica (L.f.) Cass. (niger), an important oil seed crop grown in India, is used in f... more Guizotia abyssinica (L.f.) Cass. (niger), an important oil seed crop grown in India, is used in foods, paints, soaps, and as an illuminant. During a survey conducted in 2004 to monitor Tobacco streak virus (TSV) in Helianthus annuus L. (sunflower) and Arachis hypogaea L. (groundnut), typical symptoms of leaf and petiole necrosis were observed in niger plants from Karnataka State, India. The field-collected samples reacted with TSV-specific polyclonal antiserum in direct antigen coated (DAC)-ELISA. Indicator host species were mechanically inoculated with extracts from symptomatic leaves and grown under greenhouse conditions. The inoculations resulted in local necrotic lesions on Vigna unguiculata cv. C-152 (cowpea), Gomphrena globosa, and Nicotiana tabacum cv. Xanthi (tobacco) at 3 to 4 days postinoculation (dpi) and systemic mosaic mottling on sunflower and G. globosa at 7 to 9 dpi. To identify the virus at the molecular level, total RNA was isolated (RNeasy kit, Qiagen Inc., Chatsw...

Research paper thumbnail of Nomuraea rileyi (Farlow) Samson Incidence on Spodoptera litura and Spodoptera frugiperda in Andhra Pradesh

International Journal of Current Microbiology and Applied Sciences, 2021

Research paper thumbnail of Evaluation of Blackgram Genotypes for Resistance Against Thrips and Whitefly in Relation to Leaf Curl and Yellow Mosaic Virus

A field experiment was conducted to screen the blackgram genotypes at dry land farm, S.V. Agricul... more A field experiment was conducted to screen the blackgram genotypes at dry land farm, S.V. Agricultural College,Tirupati during rabi2018-19 for identification of resistance source for utilization in developing the resistant varieties of blackgram. Total 20 genotypes along with two susceptible checks viz., TBG-140 and LBG-645 were screed for Leaf Curl and Yellow Mosaic Virus (YMV). The results revealed that PU-31 genotype recorded lowest incidence of leaf curl followed by GBG-1 and found resistant with 1 scale rating. Sixteen genotypes viz., NDUK-15-222, SRI, IPU-2-43, TBG-130, TBG-104-1, TBG-129, Butta Minumu, OBG-32, KPU-12-213, Tuti Minumu, VBG 12-111-1, LBG-787, GKB-3, LBG-623 and LBG-685 were recorded to be moderately resistant with 2 scale rating. Whereas TU-40 and LBG-752 genotypes are found to be moderately susceptible with 3 scale rating. The genotype LBG-20 found susceptible with 4 scale rating followed by two susceptible checks viz., TBG-104 and LBG-645. In case of YMV amon...

Research paper thumbnail of Influence of castor genotypes with different wax blooms on oviposition preference of endolarval parasitoid Snellenius maculipennis ( Szepligate ) of castor semilooper Achaea janata L

The A. janata larvae reared on susceptible genotype DPC-9 had significantly greater parasitisatio... more The A. janata larvae reared on susceptible genotype DPC-9 had significantly greater parasitisation by S. maculipennis than the moderately resistant genotype 48-1 and resistant genotype GCH-4 tested under nochoice, dual-choice and multi-choice conditions, suggesting that host genotypes plays a significant role in the effectiveness of S. maculipennis in parasitisation of A. janata larvae. The increased parasitism of A. janata larvae by S. maculipennis on the susceptible genotype DPC-9 might be due to the fact that the host larvae was healthy on the susceptible genotype because lack of resistance to the herbivore. Percentage parasitism was greater under no-choice condition as compared to that under multi-choice and dual choice conditions, which may be largely because of non-availability of alternate host plant to the females of S. maculipennis in no choice condition. The genotype DPC-9 was hospitable to S. maculipennis, better suited for use in integrated pest management to minimize th...

Research paper thumbnail of First Report of Tobacco streak virus Infecting Guizotia abyssinica from India

Plant Disease, 2007

Guizotia abyssinica (L.f.) Cass. (niger), an important oil seed crop grown in India, is used in f... more Guizotia abyssinica (L.f.) Cass. (niger), an important oil seed crop grown in India, is used in foods, paints, soaps, and as an illuminant. During a survey conducted in 2004 to monitor Tobacco streak virus (TSV) in Helianthus annuus L. (sunflower) and Arachis hypogaea L. (groundnut), typical symptoms of leaf and petiole necrosis were observed in niger plants from Karnataka State, India. The field-collected samples reacted with TSV-specific polyclonal antiserum in direct antigen coated (DAC)-ELISA. Indicator host species were mechanically inoculated with extracts from symptomatic leaves and grown under greenhouse conditions. The inoculations resulted in local necrotic lesions on Vigna unguiculata cv. C-152 (cowpea), Gomphrena globosa, and Nicotiana tabacum cv. Xanthi (tobacco) at 3 to 4 days postinoculation (dpi) and systemic mosaic mottling on sunflower and G. globosa at 7 to 9 dpi. To identify the virus at the molecular level, total RNA was isolated (RNeasy kit, Qiagen Inc., Chatsw...