Pepper Leaf Curl Virus Outbreak Threatens Production, Nigerian Study Reveals Spread Patterns
A widespread outbreak of pepper leaf curl virus has been confirmed in northwestern Nigeria, according to a recent study led by I. J. Yusuf from Abdullahi Fodio University of Science and Technology, Aliero, along with a multi-institutional research team. Published in 2026, the study highlights infection rates, symptom severity, and the population dynamics of insect vectors that directly affect pepper productivity an essential crop for smallholder farmers in Africa. This research is significant because pepper (Capsicum spp.) is not only a staple food ingredient but also a major source of income for millions of farmers. Nigeria is the largest pepper producer in Africa. However, production continues to face serious threats from viral diseases, particularly Pepper Leaf Curl Virus (PLCV), which can significantly reduce yields.
Virus Threat and Insect Vector
PLCV is one of the most destructive viral diseases affecting pepper crops in Nigeria. The virus is transmitted by a tiny insect known as the whitefly (Bemisia tabaci), which feeds on plant sap and spreads the virus from plant to plant. The symptoms are severe. Infected plants show curled and yellowing leaves, stunted growth, flower drop, and in extreme cases, plant death before harvest. Controlling this insect has become increasingly difficult. Excessive use of insecticides has led to resistance, making whiteflies harder to manage.
Field Research Methodology
The research team conducted field surveys during the dry season in December 2021 across two major pepper-producing areas in Kebbi State: Aliero and Jega. A total of 30 pepper plants were randomly selected at each location. The researchers then:
-Observed visual symptoms of virus infection
-Measured symptom severity using a simple scoring scale
-Counted the number of whiteflies on young leaves
This approach provided a realistic picture of field conditions, including the relationship between insect populations and disease spread.
Key Findings: High Infection and Variable Patterns
The results show that PLCV has spread widely across all surveyed locations, with varying levels of infection and severity.
Key findings include:
-Highest infection rate recorded in Kashin Zama (60%)
-Other locations such as Aliero and Birnin Malan reached 53.33%
-Lowest rate, still significant, was 40% in Jega
In terms of symptom severity:
-Aliero recorded the highest severity (2.2)
-Followed by Kashin Zama (2.0)
-Jega had the lowest (1.5), but still showed notable infection
Whitefly populations were also relatively high:
-Kashin Zama: 23 insects per plant
-Aliero: 21 insects
-Jega: 18 insects
Interestingly, the study found that the relationship between whitefly population and infection rate is not always linear. This means that even with moderate insect populations, infection levels can remain high. Other factors such as environmental conditions, crop variety, and previous infection history also play important roles.
Factors Driving the Spread
The study identified several key factors contributing to the rapid spread of the virus:
Use of susceptible pepper varieties
Plants without genetic resistance are more easily infected.
Poor field sanitation
Infected plant residues act as sources of virus transmission.
Excessive insecticide use
Leads to resistance in whiteflies and disrupts ecological balance.
Continuous cropping without rotation
Provides a stable habitat for pests and viruses.
According to Yusuf and colleagues, high infection levels in certain areas are likely driven by a combination of susceptible varieties and favorable environmental conditions for the vector.
Impacts on Farmers and Food Security
The spread of PLCV poses serious risks not only to farmers but also to food security and local economies.If left uncontrolled, the disease can cause:
-Significant yield losses
-Economic hardship for smallholder farmers
-Instability in pepper supply markets
In severe cases, total crop failure is possible.
Recommended Control Strategies
The study offers practical, field-based solutions to help manage the disease more effectively:
-Use virus-resistant pepper varieties
-Apply regular field sanitation practices
-Implement crop rotation to break pest cycles
-Reduce reliance on chemical insecticides
-Control weeds that may serve as alternative virus hosts
These strategies are considered more sustainable than continuous pesticide use.
Author Profile
Ibrahim J. Yusuf, M.Sc.
Lead researcher from Abdullahi Fodio University of Science and Technology, Aliero, Nigeria. Specializes in plant pathology and plant disease epidemiology.
Dr. A. Musa – Abdullahi Fodio University of Science and Technology
Dr. I. Bello – Usman Danfodiyo University Sokoto
Dr. I. U. Mohammed – Abdullahi Fodio University of Science and Technology
Dr. I. D. Yusif – Federal University Dutse
Dr. A. Muhammad – Abdullahi Fodio University of Science and Technology
U. Z. Khadija, M.Sc. – Federal University of Agriculture Zuru
A. Afiu, M.Sc. – Federal University of Agriculture Zuru
This team consists of experts in agriculture, entomology, and plant pathology focused on improving food security in Africa.
Source of the Study
Yusuf, I. J., Musa, A., Bello, I., Mohammed, I. U., Yusif, I. D., Muhammad, A., Khadija, U. Z., & Afiu, A. (2026).
“Assessment of Pepper Leaf Curl Virus Disease Incidence, Severity (PepYLCV) and Vector (Bemisia tabaci) Population Dynamics in Kebbi State, Nigeria.”
International Journal of Advanced Technology and Social Sciences (IJATSS), Vol. 4(3), 381–390.
 and Vector (Bemisia Tabaci) Population Dynamics in Kebbi State, Nigeria){kind=link}
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