By Dr. Rachel Mkandawire
Plants provide over 80% of the food consumed by humans and are the primary source of nutrition for livestock. Food security is the state of having reliable access to sufficient, safe, affordable, and nutritious food and it is fundamental to building healthy and productive societies. Yet, as we mark the International Day of Plant Health, it is imperative to recognize that plant health is more than just agricultural productivity. It is a critical component of global food security, environmental sustainability, and economic stability.
The rapid globalization of trade and the intensifying effects of climate change are amplifying the spread of invasive pests and pathogens, threatening plant health systems worldwide. This is particularly evident in East and Southern Africa, where the region has been grappling with devastating plant health crises such as the outbreak of the Fall Armyworm, the Banana Bunchy Top Virus (BBTV), and the Banana Xanthomonas Wilt (BXW). During the peak of the 2000–2010 BXW epidemic in Tanzania, Burundi, and Rwanda, food production and household consumption were severely affected. The production of banana beer and juices declined by approximately 60%, while the number of banana bunches sold and consumed dropped by 35% and 25% respectively. The price of banana bunches surged by 46%, pushing already vulnerable populations deeper into food insecurity (Shimwela et al., 2016).
Similarly, in Malawi, where over 30% of the population relies on banana cultivation, the outbreak of BBTV had wiped out 90% of banana plantations in the southern region by 2015. This resulted in severe economic losses for smallholder farmers, forcing the country to import over 20,000 tons of bananas annually and incurring costs of over $2 million to source disease-free planting materials (Muimba, 2017).
Meanwhile, the Fall Armyworms continue to threaten maize production across Sub-Saharan Africa, placing crops worth over $13 billion at risk annually. Smallholder farmers who lack the financial resources to implement effective pest control measures are disproportionately affected, facing yield losses of up to 58% (Day et al., 2017).
Desert locust invasions further illustrate the catastrophic impact of neglected plant health systems. In 2019, massive swarms devastated crops across East Africa, destroying over 100,000 hectares of farmland in Ethiopia and Somalia, and 175,000 hectares in Kenya (FAO, 2020, World Bank, 2020). These outbreaks not only crippled food production, but also highlighted the gap between policy frameworks and effective implementation of plant health management strategies.
A critical question remains unanswered — how much of the agricultural budget in East and Southern African countries is specifically allocated to plant health research? While some national budgets allocate funding to broader agricultural research, data on the proportion directed toward plant health research remains scarce. According to a CGIAR report, South Africa leads in financial allocation for agricultural research; however, the extent to which this funding explicitly targets plant health remains unclear. This lack of disaggregated data on plant health funding presents a significant gap, particularly given the region’s heavy reliance on agriculture. Neglecting targeted plant health research funding risks undermining agricultural systems, increasing vulnerability to pest outbreaks, crop failures, and other plant health crises. Consequently, the economic stability of countries in the region remains at risk due to insufficient investment in plant health as a distinct research focus within agricultural budgets.
Addressing such plant health crises requires more than reactive measures. It calls for a strategic integration of plant health research and robust policy frameworks that prioritize prevention, early detection, and rapid response mechanisms. Effective plant health policies must advocate for increased investment in plant health research while incorporating comprehensive biosecurity measures, pest risk assessments, and climate adaptation strategies to mitigate the spread of emerging pests.
Regional institutions like FANRPAN play a critical role in aligning agricultural policy frameworks with plant health priorities. Through initiatives like the Food Systems Transformation In Southern Africa for One (FOSTA) Health Project, FANRPAN not only addresses food production, but also incorporates significant components of plant health. By integrating plant health considerations into broader agricultural programs, FANRPAN helps to position plant health as a vital element in regional agricultural policy discourse.
Agricultural research and policy advocacy must prioritize the integration of advanced surveillance systems, data-driven interventions, and predictive modeling as key components of integrated pest management strategies. These technologies offer innovative ways to detect emerging plant health threats early, predict outbreaks, and implement timely interventions. Across Africa and other regions, successful models have been developed to anticipate disease outbreaks and mitigate impacts. For instance, the Cassava Mosaic Disease (CMD) model in East Africa provides a comprehensive framework for predicting CBSD spread and guiding surveillance strategies. In Kenya and Tanzania, predictive models for Maize Lethal Necrosis (MLN) leverage climate data and remote sensing to identify high-risk zones. Meanwhile, models for Fall Armyworm (FAW) utilize satellite imagery to forecast infestation hotspots across Sub-Saharan Africa. By integrating such predictive models into plant health strategies, countries can proactively manage pest and disease threats, thereby minimizing crop losses and protecting livelihoods.
As we commemorate the International Day of Plant Health, there is an urgent need to align national and international policies with research-driven strategies that reinforce plant health systems. Predictive modeling offers a practical pathway to optimize limited resources, enabling countries to anticipate and respond to plant health crises more effectively. By investing in plant health research, strengthening biosecurity frameworks, and fostering cross-sectoral collaborations, we can safeguard ecosystems, secure livelihoods, and build resilient food systems capable of withstanding future plant health threats
As we commemorate the International Day of Plant Health, there is an urgent need to align national and international policies with research-driven strategies that reinforce plant health systems. By investing in plant health research, strengthening biosecurity frameworks, and fostering cross-sectoral collaborations, we can safeguard ecosystems, secure livelihoods, and build resilient food systems capable of withstanding future plant health threats. Investments in predictive modelling will provide a practical pathway to optimize limited resources, enabling countries to anticipate and respond to plant health crises more effectively.
References
Day, Roger, Phil Abrahams, Melanie Bateman, Tim Beale, Victor Clottey, Matthew Cock, Yelitza Colmenarez et al. “Fall armyworm: impacts and implications for Africa.” Outlooks on Pest Management 28, no. 5 (2017): 196-201
Muimba-Kankolongo A. Fruit production in food crop production by smallholder farmers in Southern Africa: Challenges and opportunities for improvement. eBook 2018; pp. 287.ISBN: 9780128143841
Shimwela MM, Ploetz RC, Beed FD, et al. Banana xanthomonas wilt continues to spread in Tanzania despite an intensive symptomatic plant removal campaign: an impending socio-economic and ecological disaster. Food Secur. 2016;8(5):939–51.Return to ref 26 in article
World Bank. (2020). FAQs – Kenya locust response project – Kenya | ReliefWeb. Retrieved from https://reliefweb.int/report/kenya/faqs-kenya-locust-response-project