Greener Journal of Agricultural Sciences

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Dida Lontsi et al

Greener Journal of Agricultural Sciences

Vol. 9(1), pp. 14-22, 2019

ISSN: 2276-7770

Copyright ©2019, the copyright of this article is retained by the author(s)

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Effect of aqueous extracts of Thevetia peruviana K. seeds on the control of late blight and pest insects of Solanum tuberosum L. in Cameroon


Sylvere Landry DIDA LONTSI1, Zachee AMBANG1*, Champlain Lordon DJIETO2, Becaire Cedrik CHEDJOU WOUOM1, Alain HEU1, Angele NDOGHO PEGALEPO1


1 Laboratory of Phytopathology and Microbiology, Department of Plant Biology, Faculty of Science, University of Yaoundé I, Box. 812, Yaoundé-Cameroon

2 Laboratory of Zoology, Department of Animal Biology and Physiology, Faculty of Science, University of Yaoundé I, PO BOX.812 Yaoundé, Cameroon.





Article No.: 121418176

Type: Research

DOI: 10.15580/GJAS.2019.1.121418176



In the perspective of effective control of diseases and pests of potatoes (Solanum tuberosum), a study carried out in the Highland West Region of Cameroon permitted to evaluate the effect of aqueous extracts of Thevetia peruviana seeds (AETPS) on the development of late blight caused by Phytophthora infestans and the population of insect pests. Two potato varieties (local (V1) and one improved variety "Cipira" (V2) were used. Five treatments: AETPS (T1), Bravo 720 fungicide (T3), Decis 5 EC insecticide (T4), mixture of the three substances (T2) and the control (T0) were tested using a double factorial system with completely randomized blocks. The evolution of the disease, insect population and tuber yield were evaluated and compared according to different treatments. The results show that a main disease identified in field and laboratory was mildew. 88 pests were collected and 9 pest families were identified. The Coccinelidae family was most represented (23, 86%). The incidence and severity of late blight in the field were respectively reduced to 22.77 and 76.05 % by the AETPS at 50 g/l, as the synthetic fungicide (T3). The number of insects decreased after treatment but remained relatively stable in control. The insecticidal power was maximum 1 h after application of the decis contrary to the AETPS of with maximum was between 24 and 48 h. The commercial yields obtained in the AETPS treatment were greater than 7.5 t/ha compared to 0 t/ha obtained in the controls (T0). Extracts of T. peruviana can therefore be used as anti-parasite substances in crop protection.


Submitted: 14/12/2018

Accepted:  20/12/2018

Published: 31/01/2019


*Corresponding Author


E-mail: zachambang@



late blight, pests, Thevetia peruviana, aqueous extracts



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Cite this Article: Dida Lontsi, SL; Ambang, Z; Djieto, CL; Chedjou Wouom, BC; Heu, A; Ndogho Pegalepo, A (2019). Effect of aqueous extracts of Thevetia peruviana K. seeds on the control of late blight and pest insects of Solanum tuberosum L. in Cameroon. Greener Journal of Agricultural Sciences 9(1): 14-22,

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