Abstract
Soybean [Glycine max (L.) Merrill] is the most important crop in rotation farming with rice due to its ability to fix nitrogen and improve soil structure. However, many pests can cause significant yield loss in soybean production. One of the most important pests of soybean in the Mekong Delta is the legume pod borer (Etiella zinckenella) because of reducing soybean yield and quality. The objective of this study is to determine the responses of nine soybean lines to the damage level caused by E. zinckenella. The experiment was arranged in a randomized complete block design with three replications in the Spring-Summer 2015 at Can Tho University’s experimental station. The results showed that nine soybean lines were infected by pod borer. However, MTĐ 860-1 is the most tolerant line and is rated as moderately resistant (MR) while the other four varieties MTĐ 860-3, MTĐ 861-1, MTĐ 865-3, MTĐ 885-1 are classified as relative resistance (RR) to E. zinckenella. The infestation percentage in pods and grains of MTĐ 860-1 were 3.66% and 3.43%, respectively. In contrast, percentage of pod damage and yield loss was highest on ĐH4 by 9.96% and 8.60% respectively. However, significant difference in yield was not detected among the nine soybean lines.
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