Rice gall midge, Orseolia oryzae (Wood-Mason), is a major pest of rice that causes significant yield losses in India. The present study was conducted during Kharif 2023 at Krishi Vigyan Kendra, Malyal, Mahabubabad district, Telangana, to evaluate four rice genotypes carrying genes conferring resistance to gall midge (WGL-1119, IBT-WGL-2, Abhaya, and Aganni), together with TN-1 as a susceptible check, against the local gall midge population under natural infestation conditions. The experiment was laid out in a randomized block design with four replications. Gall midge incidence was assessed at 30, 50, and 75 days after transplanting (DAT) based on the percentages of plant damage and silver shoot damage, and the observations recorded at 50 DAT were used to score the genotypes according to the standard procedure. Significant differences were observed among the genotypes. Aganni, IBT-WGL-2, and WGL-1119 exhibited resistant reactions with low levels of infestation. At 50 DAT, Aganni recorded the lowest damage (2.50% plant damage and 0.52% silver shoots), followed by WGL-1119 (6.25% plant damage and 0.86% silver shoots) and IBT-WGL-2 (7.50% plant damage and 0.71% silver shoots). Abhaya showed moderate susceptibility, whereas the susceptible check, TN-1, recorded the highest infestation. Aganni and IBT-WGL-2 maintained stable resistance up to 75 DAT, whereas WGL-1119 showed a slight increase in plant damage but remained resistant based on silver shoot damage. Aganni and the pyramided lines IBT-WGL-2 (Gm4+Gm8) and WGL-1119 (Gm1+Gm4) were identified as promising sources of resistance to gall midge and as suitable resistant donors for breeding programmes. This is the first report on the response of these resistant genotypes to the gall midge population prevailing in Mahabubabad district, Telangana, India.
E. Sravanthi, S. Malathi, A. Padmakumari et al.· Uttar Pradesh Journal of Zoo...· 0 citations
Aims: To evaluate advanced rice breeding lines for their response to yellow stem borer, Scirpophaga incertulas (Walker), under augmented infestation and to identify tolerant and susceptible genotypes based on white ear damage during the reproductive phase.
Study Design: A field evaluation of rice genotypes under augmented yellow stem borer infestation across two locations.
Place and Duration of Study: The study was conducted at the ICAR-Indian Institute of Rice Research (ICAR-IIRR), Rajendranagar, Hyderabad, and Ramachandrapuram, Patancheru, Telangana, India, during kharif 2025.
Methodology: Twenty-three advanced rice breeding lines from varying backgrounds, along with three susceptible checks (Pusa Basmati 1, TN1 and RNR 15048) and three tolerant checks (Sasyasree, W1263 and SM92), were evaluated for white ear damage under augmented infestation conditions. Augmented infestation was carried out by pinning egg masses at the black-head stage. White ear incidence was recorded during the reproductive phase, and the response of the genotypes was compared across the two locations.
Results: Augmented infestation produced significantly higher white ear damage and effectively differentiated tolerant and susceptible rice genotypes. Mean white ear incidence varied widely among genotypes. W1263 (10.99% WE) and SM92 (8.31% WE) exhibited low and stable incidence across the two locations, while NLR 3989 (3.37% WE) and five other lines recorded negligible incidence (<9% WE), identifying them as tolerant sources. Pusa Basmati 1 (31.57% WE), TN1 (18.58% WE) and RNR 15048 (21.02% WE) remained consistently susceptible, whereas Sasyasree showed partial tolerance under higher pest pressure.
Conclusion: The identified tolerant genotypes can be utilised as valuable sources in breeding programmes for the development of rice varieties with reduced damage from yellow stem borer.
KVN. Sreeja, A. Padmakumari, C. N. Reddy et al.· Uttar Pradesh Journal of Zoo...· 0 citations
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