Assessing the impact of Sternochetus mangiferae (Coleoptera: Curculionidae) infestation on morphometrics and nutritional composition of mango

Abstract

 Sternochetus mangiferae (mango seed weevil) is a major pest affecting mango production, leading to significant economic and nutritional losses. This study evaluated the impact of S. mangiferae infestation on the morphometric, nutritional, and anti-nutritional properties of three mango varieties (Oyo, Ogbomoso, and Palaba) collected from different locations in Ibadan, Nigeria. Infested and non-infested mango fruits were analyzed for their physical attributes, nutritional composition, and anti-nutritional factors. Results showed significant reductions (p < 0.05) in fruit weight, seed length, and seed width in infested samples across all varieties. Adult infestation led to decreased crude protein, ash, and ether extract contents, with notable declines in calcium, magnesium, and iron levels. Anti-nutritional factors such as saponin, tannin, and flavonoid also showed reductions in infested samples. The percentage of infestation varied across locations, with the highest infestation rate recorded at Omi Adio (50%) and the lowest at Ojoo (26.67%). Among mango varieties, Palaba exhibited the highest infestation (48.33%), while Oyo had the least infestation (30%). These findings highlighted the detrimental effects of S. mangiferae infestation on mango fruit quality, emphasizing the need for effective pest management strategies to mitigate post-harvest losses and preserve nutritional integrity