Integrated management of broomrape and seed and soil borne diseases of faba bean in northern Ethiopia

Broomrape (Orobanche crenata) and fungal diseases are among the most limiting factors to faba bean production particularly in northern Ethiopia with a serious impact on household food-security. The absence of a legume rotation crop contributes to the persistence of these pests in soil. This study was initiated to identify the best combination of treatments, from among faba bean varieties, bio-inoculants and antagonists, that suppresses diseases and O.crenata infection. The study looked at the synergistic effect of bioinoculants (Rhizobium leguminosarum and Trichoderma harzianum) and varieties (Hashenge, Walki, and Moti and a local susceptible cultivar) on the severity of O. crenata infestation and faba bean yield. Variety and bio-inoculation with R. leguminosarum and T. harzanium singly or in combination resulted in significant grain yield improvements. The combined use of T. harzanium and R. leguminosarum on the Orobanche resistant variety resulted in yield increments of about 29% over the uninoculated resistant variety. The yield increment recorded by the orobanche resistant variety treated by both inoculants over that of the remaining varieties treated with both inoculants ranged from 527% to 1012%. The findings of the study so far demonstrate that a combination of a resistant variety and application of both R. leguminosarum and T. harzanium can improve plant growth, both biomass and seed yield of faba bean.
Orobanche (Orobanche crenata) et les maladies fongiques sont parmi les facteurs les plus limitants de la production de haricot féverole particulièrement en Ethiopie du nord avec un sérieux impact sur la sécurité alimentaire des ménages. L’absence d’une culture de rotation des légumineuses contribue à la persistance de ces parasites dans le sol. Cette étude a été effectuée pour identifier la meilleure combinaison de traitements, parmi les variétés de féverole, les bio-inoculants, et les antagonistes, qui suppriment les maladies et les infections d’O. crenata. L’étude a examiné l’effet synergique des inocula (Rhizobium leguminosarum et Trichoderma harzianum) et des variétés (Hashenge, Walki et Moti et un cultivar local sensible) sur la gravjusqu’à présent une combinaison d’une variété résistante et de l’application conjointe de R. leguminosarum et T. harzanium peut améliorer la croissance des plantes, la biomasse et le rendement de graines de féverole.
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