Repellent and toxic of macerât of Tithonia diversifolia (Hemsl.) gray (Asteraceae) on Ancistrotermes sp. at the laboratory
Diby Yao Kan Séraphin, Tahiri Annick, Adja Nahoulé Armand, Danho Mathias, Akpesse Akpa Alexandre Moïse, Kouassi Kouassi Philippe
Biological tests conducted at the laboratory of Entomology and Agricultural Zoology of the National Polytechnic Institute Houphouët-Boigny (INP-HB) of Yamoussoukro (Côte d’Ivore) allowed to evaluate the termitive and toxic effect of Tithonia diversifolia macerate on Ancistrotermes sp. Tithonia diversifolia macerate prepared at 10 and 13% (100g / L and 130g / L) was used to evaluate contact, consumption and barrier soil toxicity. The direct toxicity test shows that the mortality rate in the tests is higher than that of the controls and this as a function of the macerate dose. The 13% concentration is more toxic than the 10% concentration (LC50 is 16,020 mg / 13% versus LC50 42,905 mg / L at 10%). At the lowest dose (10 μl), 50% of the mortality was reached from the 8th day with the 13% solution against 11% with the 10% solution. The consumption test reveals that termites consume very little treated papers (1.25 mm2 / worker for the dose of 10% and 0.50 mm2 / worker for that of 13% against 12.13 mm2 / worker in the witnesses). In the soil barrier (excavation) test, the total mortality rate obtained in the trial arenas of 10% and 13%, respectively, is 2.6 and 2.8 times higher than that of the control arenas, respectively. The excavation test confirms that the product is toxic. The tunnel constructions were observed in the introduction chambers and in the substrate chambers both in the tests and in the controls. The pieces of filter paper in the food chambers located after the treated substrate chambers were not consumed in the test arenas dosed with 13% extract of T. diversifolia. The macerate of Tithonia diversifolia does not prevent the termite from coming into contact with the treated soil but reduced or completely prevent consumption in the food chambers contiguous to the treated substrate chambers. T. diversifolia seems to be non-repellent but anti-appetizing for termites.
Diby Yao Kan Séraphin, Tahiri Annick, Adja Nahoulé Armand, Danho Mathias, Akpesse Akpa Alexandre Moïse, Kouassi Kouassi Philippe. Repellent and toxic of macerât of Tithonia diversifolia (Hemsl.) gray (Asteraceae) on Ancistrotermes sp. at the laboratory. International Journal of Multidisciplinary Research and Development, Volume 5, Issue 12, 2018, Pages 143-147