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This project, named Sentinel, aims to provide a cheap, reliable, and globally networked “24/7” in-field bio-alarm system to detect, within a matter of hours, fungal and, potentially, bacterial pathogenic attacks on crops. Furthermore, whatever remedial action is taken has deleterious ecological effects and is costly. Many of the symptoms described earlier are not apparent to the naked eye until after the infection has progressed to a point where intervention is ineffective, leading to inevitable crop degradation or losses. Thus, there exists significant scope for developing a low-cost, low-power, user-friendly technological means for early-warning spore detection in the region. Yellow rust routinely destroys, or otherwise renders unusable, between 5% and 25% (in rare instances) of wheat crop harvested. More specifically, its annual wheat production accounts for the dominant share (41.6%) of that of all Sub-Saharan African (SSA) countries. In addition, close to 72.7% of its labor force work in the agricultural sector. Ethiopia’s climate is amenable to wheat cultivation all year round, and 81% of its exports are accounted for by agricultural products, which constitute 34.8% of its gross domestic product. We consider Ethiopia as an example to highlight how yellow rust affects harvested wheat crops. As such, in countries where wheat is grown during the winter or at high elevations, yellow rust is a common threat. Temperatures during the time of winter wheat emergence and the coldest period of the year are crucial for the development of epidemics. Symptoms include stunted development and weakening of affected crops, reduced numbers of spikes, shriveled grains occurring in fewer numbers per spike than on healthy plants, and losses in grain mass. The onset of disease typically occurs early in the growth season, when the ambient temperature falls within a range of 2 to 15 ☌, but can occur up to a maximum of 23 ☌. Though the spores primarily target leaf blades, leaf sheathes and spikes can also be affected in conditions of high humidity and rainfall, or during epidemics. It is so named due to the yellow striations it forms along venations on leaf blades, which resemble the surface texture and discolouration attributed to oxidation in ferrous metals. tritici), also known as wheat stripe rust, is a fungal micro-organism which blights wheat crops worldwide. Wheat yellow rust ( Puccinia striiformis f. Results show that that the developed sampler is capable of enhancing the probability of yellow rust spores interacting with an internal sensor by a factor of between 20 and 25 demonstrating the effectiveness of the developed design. Experimental validation of numerical simulations was performed using wind tunnel testing and practical performance such as weathervaning was demonstrated. Performance of the device has been simulated using Lagrangian particle tracking embedded into computational fluid dynamics (CFD) simulations, demonstrating significant improvements across a range of spore Stokes numbers. This represents a novel design context for fluidic devices. This paper, therefore, proposes design and testing processes to develop a spore sampling device that is compact, passive (requires no power to operate), and can better direct spores onto a biomimetic sensor platform enhancing the capture and detection of pathogens. Moreover, tools for the design and development of such devices are currently limited. Historically, spore sampling has been undertaken by large, cumbersome devices that require heavy power supplies and significant expertise to reliably operate. Regionally recurrent losses of up to 5% are common and reach as high as 25% in rare cases. Yellow rust is a hazard to crops which appears asymptomatic for a time, but inevitably causes significant losses in yield once symptoms of infection manifest themselves to the point where they can be readily observed by the naked eye. Yellow rust spores currently blight commercial and domestic wheat production in areas of East Africa such as Ethiopia.