Antixenosis in maize to the spotted stem borer Chilo partellus Swinhoe Cholla Anil Kumar, Kumar Pradyumn1,*, Chander Subhash, Suby S.B.1 Division of Entomology, ICAR-Indian Agricultural Research Institute, New Delhi, 110012 1ICAR-Indian Institute of Maize Research, Pusa Campus, New Delhi, 110012 *Corresponding author Email pradyumn.kumar@gmail.com
Online published on 23 October, 2018. Abstract Maize genotypes were evaluated for ovipositional antixenosis to identify genotypes with high level of resistance to spotted stem borer, Chilo partellus Swinhoe. In both multi and no-choice tests, oviposition was observed on all genotypes, which significantly varied among the genotypes. Genotypes WNZPBTL 2, CM-500, PFSR 51016/1, WNZPBTL 6, AEB (Y) C5 F 38-1, HK I-PC-5 and CM-202 revealed significantly lesser egg masses/plant. In multi choice test WNZPBTL 2 was observed with 11.1 eggs/egg mass, that was near to the resistant check CM-500(14.2) whereas, in HKI-1378 and HKI-1352, it went up to 45.0 and 48.3 eggs/egg mass, respectively and thus closer to the susceptible check, Basilocal Selection (56.9). Likewise, WNZPBTL 2 with 16.3 eggs/plant was near to the resistant check, CM-500 (14.2); with HKI-1352 and HKI-1378, it was 219.3 and 207.1 eggs/plant respectively, and on par with the susceptible check, Basilocal Selection (184.0). Under no-choice test, PFSR 51016/1, WNZPBTL 3 and WNZPBTL 6 revealed the least number of egg masses/plant and these were near to CM-500 (1.81); on the other hand WNZPBTL 6, WNZPBTL 3, YCY 2-2-4-1, PFSR 51016/1, WNZPBTL 10 (9 F), WNZPBTL 2, CM-202 and V 351 revealed significantly less eggs/plant and these were statistically on par, and near to the resistant check. Genotypes HKI-1378, HKI-1352, HK I-PC-5 and HKI-163 were observed with maximum number of eggs/plant, and were on par with each other, and near to the susceptible check. Correlation analyses between multi and no choice experiments revealed significant positive correlation of egg masses laid on genotypes (0.363*) and number of eggs laid (0.555**). Top Keywords Maize, antixenosis, Chilo partellus, egg masses/plant, number of eggs/mass, correlation, resistant, susceptible checks. Top |