The noctuid pod borer, Helicoverpa armigera, is one of the most important pests of pigeonpea, and plant resistance is an important component for minimizing the extent of losses caused by this pest. To develop insectresistant cultivars, it is important to understand the contributions of different components of resistance, and therefore, we studied the antixenosis mechanism of resistance to H. armigera in a diverse array of pigeonpea genotypes under no-choice, dual-choice, and multi-choice conditions. Antixenosis for oviposition was observed in case of ICPL 187-1, ICP 7203-1, ICPL 88039, T 21, ICPL 84060, and ICPL 332 under no-choice, dual-choice and multi-choice conditions. However, the number of eggs laid on ICPL 88039, T 21 and ICP 7203-1 did not differ significantly from those on ICPL 87 under dual-choice conditions. The susceptible check, ICPL 87 was highly preferred for oviposition. The genotypes ICP 7203-1, ICPL 187-1, T 21, ICPL 332, and ICPL 84060 can be used as sources of non-preference mechanism of resistance in pigeonpea improvement programs to breed for resistance to H. armigera.
The experiment was conducted in the consecutive two years 2016 and 2017 in the field conditions. As such, based on the overall mean values of two years' of investigations, the least percentage of dead-heart (1.87%) was recorded in case of Suraksha, followed by Kavya (4.50%), Lalat (5.59%), CR Dhan -303 (5.94%), CR Dhan -205 (6.77%), Sahbhagi Dhan (6.88%), CR Dhan -304 (7.02%) and Naveen (7.27%). These rice cultures were rated as promising and resistant against dead heart incidence, caused by YSB. The susceptible rice variety, TN-1 received the highest dead-heart amounting to 19.70 percent in the present studies based overall mean of two years' results. As such, based on the overall mean values of WE recorded during two years' investigations, the least percentage of white ear (3.16%) was noticed in case of Suraksha which remained at par with Kavya (4.34%), Akshay Dhan (3.46%), IR-20 (4.36%), IR-36 (4.50%), IR-64 sub-1 (4.64%) and followed by CR Dhan-304 (5.27%) CR Dhan -303 (5.78%), Lalat (6.66%) and Sahbhagi Dhan (9.63%) and all these rice genotypes received below 10 per cent white ear, caused by the stem borer, as against the highest incidence of WE was observed in the susceptible variety, TN-1 (22.71%) in the present studies. The test genotype could be arranged in descending order of: Ac Dhan (61.15 q/ha) > Advanta-801 + (59.30 q/ha) > CR Dhan -205 (52.58 q/ha) > CR Dhan -303 (51.16 q/ha) > Lalat (50.95 q/ha) > IR-36 (50.34 q/ha) > Abhisek (49.78 q/ha) in terms of grains yield and all these seven genotype remained statistically at par. TN-1 appeared as susceptible to yellow stem borer.
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