Fumigant efficiency of Plectranthus glandulosus essential oils against Sitophilus zeamais as influenced by site and plant age
Gangue Tiburce, Suh Christopher, Ngassoum Martin Benoit and Nukenine Elias N
Postharvest losses are higher in tropical regions where insects like Sitophilus zeamais are more involved in storage damage. Plectranthus glandulosus, already used by peasants to protect stored product, and rich in essential oils is well indicated for fumigant test against S. zeamais. Essential oil was obtained through hydrodistillation of leaves from plant of two different ages and from three locations. The essential oil yield ranged from 0.19 (Mbang-Foulbe elder plant) to 0.41% (Mbang-Foulbe young plant). The fumigant efficacy was logarithmic with 50% mortality being attained within 4h. This efficacy varied with plant age in Galdi and Mbang-Foulbe. Nguerngaou elder plant, Mbang-Foulbe young plant, and Galdi elder plant were the most efficient with LC50 of 0.667, 0.942, and 1.098 µl/l respectively. Therefore, P. glandulosus is really fumigant with varying efficacy. However for its usage, it should be harvested instead of cleared in shepherd farms where it grows as a weed.
Gangue Tiburce, Suh Christopher, Ngassoum Martin Benoit, Nukenine Elias N. Fumigant efficiency of Plectranthus glandulosus essential oils against Sitophilus zeamais as influenced by site and plant age. J Entomol Zool Stud 2017;5(6):2230-2236.