$Jawaharlal Nehru Technological University (JNTU), Kukatpally, Hyderabad - 500 035, Andhra Pradesh, India.
International Crops Research Institute for the Semi Arid Tropics (ICRISAT), Patancheru - 502 324, Andhra Pradesh, India. E mail: h.sharma@cgiar.org
The reaction of a diverse array of sorghum genotypes to sorghum shoot fly, Atherigona soccata in terms of antixenosis for oviposition, antibiosis, and recovery resistance under greenhouse and field conditions to identify genotypes with stable resistance to the insect was studied. Antixenosis for oviposition was observed under multi- and dualchoice conditions in case of IS 1054, IS 1057, IS 2146, IS 4664, IS 2312, IS 2205, SFCR 125, SFCR 151, ICSV 700, and IS 18551. However, antixenosis for oviposition was not apparent under no-choice conditions. Antibiosis (expressed in terms of prolonged larval and pupal development, and/or larval and pupal mortality,) was observed in case of IS 2146, IS 4664, IS 2312, SFRC 125, ICSV 700, and IS 18551. The genotypes IS 1054, IS 1057, IS 2146, IS 2205, and IS 4664 showed lower percentage of tiller deadhearts than the susceptible check, Swarna. IS 2312, SFCR 125, SFCR 151, ICSV 700, and IS 18551, which exhibited antixenosis, antibiosis, and tolerance components of resistance, may be used in sorghum improvement to develop sorghum cultivars with resistance to this pest. Genotypes with diverse combination of characteristics associated with resistance to sorghum shoot fly can be used in breeding programmes to broaden the genetic base and increase the levels of resistance to this pest.
Sorghum bicolor, sorghum shoot fly, Atherigona soccata, Resistance mechanisms, antixenosis, antibiosis, recovery resistance
