African maize borer

Systematic position: Mussidia nigrivenella Ragonot is a lepidopteran moth belonging to the family Pyralidae. It is widely recognized as a serious economic pest affecting various agricultural commodities in tropical Africa, causing significant yield losses both in the field and in storage.

Host crops: This insect is a polyphagous pest, with maize and cocoa being its primary hosts. However, it also attacks peanuts, cowpeas, sorghum, coffee berries, and cashew nuts. Its ability to infest a variety of crops allows the population to persist in agricultural landscapes throughout the year.

Biology and life cycle: The life cycle comprises egg, larval, pupal, and adult stages. The moths are nocturnal, and females lay eggs on the surface of developing ears or fruits. Once hatched, the larvae penetrate the plant tissue immediately. The duration of the cycle is highly dependent on temperature and humidity, with faster development occurring in warm, moist conditions.

Damage and economic impact: The damage is caused by the larvae feeding inside the grain or fruit. This direct feeding results in weight loss and physical damage. Furthermore, the larval frass creates an environment for mold growth, specifically Aspergillus species, leading to aflatoxin contamination, which poses a severe risk to food safety and trade standards.

• Planting resistant or early-maturing crop varieties.
• Synchronized planting to reduce the availability of susceptible host stages.
• Use of pheromone traps to monitor adult flight and time insecticide applications.
• Biological control through the release of parasitoids like Trichogramma species.
• Strict post-harvest sanitation to eliminate breeding grounds in storage facilities.