Ngatsi Et Al

Ngatsi et al

 

 

 

Effect of Stictococcus vayssierei Richard
(Hemiptera: Stictococcidea) on growth and yield of cassava (Manihot esculenta Crantz)

 

 

Patrice Zemko Ngatsi1*, Bekolo Ndongo1, Désiré Anaba
Manga1, Eric Biyo’a Ndongo1, Champlain
Djieto-Lordon2

 

 

1Department
of Plant Biology, Plant Pathology Laboratory, University of Yaoundé 1, Yaoundé,
Cameroon

2 Department
of Plant Animals, University of Yaoundé 1, Yaoundé, Cameroon

 

 

 

ARTICLE INFO

ABSTRACT

 

Article No.: 031020048

Type: Research

 

 

Cassava cultivation faces many constraints including various pathogens
and pests. Among the pests of cassava, the African Root and Tuber Scale
(ARTS) Stictococcus vayssierei
(Hemiptera: Stictococcidea) is a sap-sucking insect that colonizes tubers and
roots of cassava plants in humid Central Africa. Infestation by this pest
affects plant physiology and severely reduces the productivity, causing 60 to100%
yield losses in the field. The objective of this study is to evaluate the
harmful effect of S. vayssierei on
cassava yield in the field. The experiment was carried out using a completely
randomized Fisher’s blocs design with four replicate on six cassava
varieties, four of which were improved and two local. During 12 months with a
sampling interval of three months, the number of scale insects per plant,
growth parameters, incidence and severity of the most important diseases, as
well as yield were evaluated. As result, at 12 months after planting (MAP),
the highest fresh shoot weight (2.69 ± 0.43 kg) as well as of fresh tuber
yield (23.8 t ha-1) were obtained with the local variety Douma; at
opposite
, the Excel variety produces the lowest fresh shoot weight (1.69 ±
0.15 kg) and yield (14.1 t.ha-1).
The average number of scale insects per plant (ARTS/P) was greater
with the Excel variety (90.12 ARTS/P) and lowest on the 96/0023 variety
(58.14 ARTS/P). In addition to ARTS infestation, two biotic constraints,
namely cassava mosaic disease (CMD)
and cassava anthracnose disease (CAD), appeared in the plots, with varying
incidence and severity. Finally, it appeared that S. vayssierei through damage to cassava plants leads to a
decrease in the productivity of cassava varieties, especially on improved
varieties.

 

Accepted:  15/03/2020

Published: 22/06/2020

 

*Corresponding Author

Ngatsi PZ

E-mail: ngatsipatrice@
gmail.com

Phone: (237)
675974551

 

Keywords:

Scale insect; Manihot esculenta; growth; yield

 

 

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Cite this Article: Ngatsi PZ; Ndongo B; Manga DA; Ndongo EB;
Djieto-Lordon C (2020). Effect of Stictococcus
vayssierei
Richard (Hemiptera: Stictococcidea) on growth and yield of
cassava (Manihot esculenta Crantz).
Greener
Journal of Agricultural Sciences
10(2): 95-102.

.

 

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