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Termites and maize crops: assemblage composition, damage level, and varietal sensitivity in contrasting agro-ecological zones of the Republic of Benin

par Loko, Yêyinou Laura;Toffa, Joelle;Orobiyi, Azize;Gavoedo, Dieudonné Martin;Dansi, Alexandre;Tamo, Manuele;Roisin, Yves
Référence International journal of pest management
Publication Publié, 2021-08-26

Article révisé par les pairs

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Résumé :

Termites are considered as important pests of maize plantations in Republic of Benin. However, very little information is available on their assemblage composition, abundance, damages, and on the sensitivity of common maize varieties in Benin. This study aims to fill these gaps and provide baseline for the development of an integrated termite management in maize plantations. Therefore, 60 maize fields across 30 villages located in four agro-ecological zones of southern Benin were prospected using the standardized method of belt transects. In addition, the resistance of five maize varieties to termite attacks was evaluated on-farm during two consecutive seasons (2018 and 2019). Fifteen termite species belonging to 11 genera, 6 subfamilies and 3 families were collected in the prospected maize fields. Four species (Macrotermes subhyalinus Rambur, Coptotermes sjostedti Holmgren, Amitermes evuncifer Silvestri, and Trinevitermes germinatus Wasmann) were found in all agro-ecological zones with A. evuncifer as the most abundant species. High similarity indices of termite assemblages were found between the four agro-ecological zones. Wood-feeders group and species nesting in hypogeal nests were the mostly abundant in all agro-ecological zones. The attack rate of termites in maize fields was 16.9% and did not vary significantly between agro-ecological zones. A. evuncifer and C. sjostedti were significantly the most destructive species on the five evaluated varieties, although Trinevitermes oeconomus Trägardh was most abundant in leaf sheaths; M. subhyalinus and Macrotermes bellicossus Smeathman in the stem; Pseudacanthotermes militaris Hagen and Odontotermes sp. in the roots. Termite damage level to maize depended of the variety. Korga variety was classified as highly resistant to termite attacks; Agbadé kouin winiwini variety as resistant; Igbado tchakpa variety as moderately resistant. While, Elèkpèrè and Forkui varieties were classified as highly susceptible. The three maize varieties identified as resistant to termite attack should be included in the development of an integrated termite management program and in future breeding programs.