蚕豆、豌豆都是豆根直条象甲的幼虫和成虫两个阶段最喜欢食用的植物。在大多数蚕豆、豌豆植株上容易发现边缘有被豆根直条象甲成虫咬缺的叶片。该成虫还是蚕豆染色病毒和蚕豆花叶病毒的传播媒介。尽管由豆根直条象甲成虫造成的危害很值得重视,但只有少数种植者知道其幼虫在蚕豆和豌豆根部,特别是在正在固氮的根瘤上嚼食。大量幼虫为害对蚕豆的产量和蛋白质含量有影响。豆根直条象甲幼虫伤害根瘤的主要影响是减少氮的固定和吸收,导致植株缺氮型黄化。此种幼虫对蚕豆产量的影响看来不会因从土壤中吸收氨而缓减,因为在洛桑试验站试验中, Broad beans, peas are the root of straight beans like larvae and adult two stages of favorite food plants. In most fava beans, pea plants are easily found on the edge of the leaves have a straight root like a biting leaves adult leaves. The adult worms or broad bean mosaic virus and broad bean mosaic virus vector. Although the harm caused by the instar larvae of R. solani is noteworthy, only a few growers know that their larvae chew on the roots of broad beans and peas, especially on nitrogen fixing nodules. Large number of larvae damage on the yield and protein content of Vicia faba. The main effect of rooting of larvae as nymphs on nodules is to reduce nitrogen fixation and uptake, leading to plant nitrogen deficiency yellowing. The effect of such larvae on the yield of broad beans does not appear to be mitigated by the absorption of ammonia from the soil because in the Lausanne test station,