Dida Lontsi Et Al

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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)

DOI Link: http://doi.org/10.15580/GJAS.2019.1.121418176

http://gjournals.org/GJAS

 

 

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 INFO

ABSTRACT

 

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

AMBANG Zachee

E-mail: zachambang@ yahoo.fr

 

Keywords:

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, http://doi.org/10.15580/GJAS.2019.1.121418176

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