Greener Journal of Agricultural Sciences

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Ngatsi et al

Greener Journal of Agricultural Sciences

Vol. 10(2), pp. 95-102, 2020

ISSN: 2276-7770

Copyright ©2020, the copyright of this article is retained by the author(s)

https://gjournals.org/GJAS

 

 

 

 

 

 

 

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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