Incessant variabilities in climatic factors critically minimise crop yield globally. The instability in weather impacts crop survival culminating in 70% yield loss, thus threatening food availability on a global scale. Considering the high negative impact of abiotic stressors on plants and, consequently food security, early detection is key to early intervention in order to reduce crop losses due to abiotic stress. Modern technologies such as bio and nanotechnologies are vital in the detection of abiotic stressors, thereby increasing production and improving the quality of food produced by farmers. The adaptability of nanoscience made development of effective nanosensors possible, biosensors have the advantage of earlier detection scope and immediate analysis. Plant signalling biomolecules trigger monitoring devices electronically to evaluate crop status and equally help facilitate timely and effective management. Nano biosensors present one of the most current and excellent methods to reduce the incidence and impacts of abiotic stressors on crops, especially in the face of continual changes in climatic conditions. This chapter  summarises the application of biosensors for detection and management of abiotic stressors in plants.