Antixenosis of soybean promising lines and the level of resistance against Etiella zinckenella, the pod borer

Abstract

This study aimed to determine the antixenosis of soybean genotypes and the resistance to pod borer. 16 successful lines of soybean were used. Planting dates were arranged in a way to integrate the flowering period of 16 promising lines of soybean. For two days, a pair of four-day adult pod borers were infested in each plant at the R4 stage. The result revealed that the difference in soybean promising lines had a major impact on the population of egg and larva, and on the pod damage severity. The lowest egg (1 egg/plant) was identified in Grb/Myp-16 and GH-Gn-8, while the lowest larval population (1 individual/plant) was in GH-Gn-8. The lowest impaired pod intensity was found on Grb/Myp-16 and Brg/Myp-13. The weight of the seed ranged from 2.4 to 6.5 g/plant. The trichome density ranged from 28.3-72/mm 2 with three different positions (leaning, skewed and upright). In summary, four soybean promising lines were consistently resistant to pod borer, Brg/Myp-13, Grb/Myp-16, GH-Gn-8, and GH/KR-13. The resistance was antixenosis or non-preference as both a place to lay eggs so as a feed. These lines had the possibility as a genetic source to improve resistance to Etiella zinckenella.