Ceratitis cosyra
Common name: Mango fruit fly
Family: Tephritidae
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The marula fruit fly belongs to the genus Ceratitis, a predominantly Afrotropical group, and is widely distributed across sub-Saharan Africa, including southern Africa. As its name suggests, the wild marula tree (Sclerocarya birrea) is a particularly important host in the region, giving the fly a strong natural reservoir from which it can move into cultivated orchards, especially mango.
Marula fruit fly female (top) and male (bottom). – Natasha Bouwer
Close-up of a Marula fruit fly photographed under a microscope, highlighting its distinctive morphological features. – Natasha Bouwer
Adults can be distinguished from the closely related Mediterranean and Natal fruit flies by a characteristic pattern of yellow bands across the wings, combined with three black markings on the rear half of the scutellum (the shield-shaped plate behind the thorax). As with other Ceratitis fruit flies, females use a needle-like ovipositor to lay eggs just beneath the skin of ripening fruit. The eggs hatch into small, legless maggot-like larvae that feed and develop inside the fruit flesh before dropping to the ground to pupate in the soil, later emerging as adult flies.
While the marula fruit fly has been recorded from a considerable number of hosts across several plant families, it is particularly associated with marula and mango, and can also affect other soft, ripening fruit crops grown in the same production areas.
Females puncture the fruit skin to lay eggs, and these puncture marks can allow entry for secondary rot-causing organisms. As larvae feed inside the fruit, the flesh breaks down internally, often before external symptoms become obvious, and affected fruit typically drops prematurely or is rendered unmarketable. Because damage develops from the inside out, infestations are easy to miss until fruit is cut open or has already begun to collapse.
Because adult flies must be intercepted before females lay eggs, pheromone- and food-based trapping for early detection and mass trapping is the cornerstone of fruit fly management in South African orchards, supported by orchard sanitation (removing and destroying fallen and infested fruit to break the life cycle).
Insect Science solution: For citrus and mango crops, E.G.O. PheroLure® used together with a McPhail Trap provides a solution for monitoring Ceratitis fruit flies, including the Marula fruit fly. For management, Last Call™ F.F. can be used.
