Abstract
Common bean has versatile benefits such as nutritional, environmental and economic benefits for the producers and consumers. However, its production has been affected and threatened by a number of biotic factors. Survey was conducted in 2018/19 cropping season within three woredas of Metekel Zone, Benshangul-Gumz region, Ethiopia, with the objective of identifying and prioritizing haricot bean diseases.The result revealed that haricot bean production in the Zone is affected by eleven diseases which are caused by fungi, bacteria and virus. Based on the disease severity, incidence and prevalence scores, the diseases are categorized in to Major, intermediate and Minor disease. Angular Leaf Spot (Pseudocercospora griseola), Anthracnose (Colletotrichum lindemuthianum), Floury leaf spot (Mycovellosiella phaseoli), and Cercospora leaf spot (Cercospora cruenta are grouped in to major diseases. Rust (i), Web blight Rhizoctonia solani Kuhn (teleomorph Thanatephorus cucumeris (Frank) Donk), Ascochyta blight (Phomaexigua var. exigua/Ascochyta phaseolorum acc) and Bean common mosaic virus (potyvirus) are categorized as Intermediate and the remaining three diseases: Halo blight (Pseudomonas syringaepv. phaseolicola), Common Bacterial Blight (Xanthomonas axonopodis pv phaseoli) and Downy Mildew (Phytophthora phaseoli Thaxt) are grouped under minor diseases. The survey revealed, the common bean production and disease management practices and variety development efforts for the Zone, onwards, should focus on those major disease (such as Angular Leaf Spot, Anthracnose, Floury leaf spot, and Frog Eye leaf spot) in order to sustain production and productivity of common bean cultivars.
Highlights
In 2016/17 cropping season, in Ethiopia, common bean covered 290,202 hectares of land, and harvested 4,839,227 quintals of produce with productivity of 16.7 quintals per hectare and it was produced by around 4 million head house hold farmers in Ethiopia [1]
In Ethiopia, Common bean suffers from a wide range of leaf, stem and root diseases such as common bacterial blight (CBB), rust, anthracnose, angular leaf spot, web blight and bean common mosaic virus
The survey revealed that haricot bean production in Meteke Zone is affected by eleven diseases caused by fungi, bacteria and virus (Table 2)
Summary
In 2016/17 cropping season, in Ethiopia, common bean covered 290,202 hectares of land, and harvested 4,839,227 quintals of produce with productivity of 16.7 quintals per hectare and it was produced by around 4 million head house hold farmers in Ethiopia [1]. Anthracnose and angular leaf spot are reported to have wide distributions [2]. In Ethiopia, Common bean suffers from a wide range of leaf, stem and root diseases such as common bacterial blight (CBB), rust, anthracnose, angular leaf spot, web blight and bean common mosaic virus. Common bacterial blight, rust, and anthracnose are the most important and widely distributed than angular and floury leaf spot [3], while the others though important, are much more restricted in their distribution [4]. Tesfaye, reported that, anthracnose, rust, common bacterial blight, angular leaf spot, ascochyta blight, and bean common mosaic virus are the most important in the country [5]. The result prioritized four diseases to be targeted and develop strategies to control angular leaf spot, Anthracnose and floury leaf spot and Cercospora leaf spot in North western Ethiopia
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