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



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

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







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
, 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


Accepted:  15/03/2020

Published: 22/06/2020


*Corresponding Author

Ngatsi PZ

E-mail: ngatsipatrice@

Phone: (237)



Scale insect; Manihot esculenta; growth; yield



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Ambe JT, Ntonifor NN, Awah ET, Yanine JS (1999).
The effect of planting dates on the incidence and population dynamics of the
cassava root scale, Stictococcus
, in Cameroon’, International Journal of Pest Management. 45:


CNRCIP. (1989). Annual report for 1989 of
13, Njombe, Cameroon: IRAD Njombe).


Dejean A and Matile-Ferrero D (1996). How
a ground-dwelling forest ant species favors the proliferation of an endemic
scale insect (Hymenoptera: Formicidae; Homoptera: Stictococcidae).
Sociobiology. 28: 183-195 Biology 56: 481-501.


Fokunang C.N, Dixan AGO and Akem CN (2000).
Field reaction of cassava genotypes toanthracnose, facterial bligtht, cassava
mosaic disease and their effets on yield. Africa Crop Science Journal, 8 (2):


Graziosi I and Wyckhuys KAG (2017).
Integrated management of arthropod pests of cassava: the case of Southeast
Asia. In Hershey C (ed.), Achieving Sustainable Cultivation of Cassava, vol II.
Cambridge: Burleigh Dodds, pp. 1–26.


Hanna R, Tindo M, Wijnans L, Goergen G,
Tata Hangy K, Lema K, Toko M, Ngeve JM, Dixon A, Gockowski J (2004). The
African root and tuber scale problem in Central Africa: the nature of the
problem and the search for control options. In: Book of Abstracts of the 9th
Triennial Symposium of the International Society for Tropical Root Crops-Africa
Branch, 31 October–5 November 2004, Mombasa, Kenya. 57 p.


Hawkins CDB, Whitecross MI and Aston MJ (1986).
Interactions between aphid infestation and plant growth and uptake of nitrogen
and phosphorous by three leguminous host plants. Canadian Journal of Botany 64,


International Institute of Tropical Agriculture,
How to start a cassava field, a guide to IPM practice
for extension workers.IITA, Ibadan, Nigeria. 24 p.


Johnson PJ 2009. Mealybugs on orchids.
American Orchid Society, Available online at


Jose A, Makeshkumar T and Edison S (2008).
Host Range of Sri Lankan Cassava Mosaic Virus. Journal of Root Crops, 2008,
Vol. 34 No, 1, PP, 21-25, (34 1): 21-25.


Kamau J, Melis R, Mark-Laing, Derera J,
Shanahan P, Ngugi CKE (2011). Farmers ‘participatory selection for early
Bulking Cassava genotypes in semi-arid Eastern Kenya. Journal of Plant Breeding
and crop sciences. 3: 44-52.


Rü B, Tertuliano M, et Calatayud PA (1991). Les différentes catégories de résistance
des plantes-hôtes de la cochenille du manioc Phenacoccus manihoti (Hom. Pseudococcidae):
Perspectives d’études. Résume du 4ème Atelier du Réseau CORAF Manioc :
Biocénose des principaux ravageurs du manioc et lutte biologique. IITA Bénin-
Cotonou, 4-9 mars 1991. (Sous presse).


Lema KM, Tata-Hangy K, Bidiaka M (2004).
Management of African root and tuber scale using improved cassava genotypes and
mineral fertilisers African Crop Science Journal. 12: 217-221.


Liu J, Zheng Q, Ma Q, Gadidasu KK. and Zhang
P (2011). Cassava genetic transformation and its application in breeding.
of Integrative Plant Biology. 53 (7): 552–569.


Maho YEJ (2017). Epidémiologie de l’anthracnose sur quelques
variétés de manioc (Manihot esculenta
Crantz) et caractérisation de collectotrichum
agent causal de la maladie au Cameroun. Thèse Ph.D.
Université de Yaoundé I. 162 p.


Mallot PG, and Davy AJ (1978). Analysis of
effects of the bird cherry-oat aphid on the growth of barley. Unrestricted infestation.
New Phytologist 80: 209-218.


Miles PW (1987). Feeding process of
Aphidoidea in relation to effects on their food plants. In Aphids: their
biology, natural enemies, and control, pp. 321-339. Eds A. K. Minks and P.
Harrewijn. Amsterdam : Elsevier Science Publishers B.V.


Mutsaers H, Mbouémboué P, Mouzong B (1981).
Traditional food crop growing in the Yaoundé area (Cameroon). Part I. Synopsis
of the system Agro-Ecosystems. 6: 87-273.


Ndengo NE, Ki-Munsek, AL, Hanna R, Mahungu
NM, Ngbolua K (2016a). Influence of the population density of the African root
and tuber scale insect (Stictococcus
Richard) on the yields of Cassava (Manihot esculenta CRANTZ) improved in different Agro-ecological
zones of Beni (North Kivu, DR Congo). International Journal of Innovation and
Applied Studies 16: 247-259.


Ndengo NE, Ki-Munsek, AL, Hanna R, Mahungu
NM, Ngbolua K (2016b). Screening cassava (Manihot
CRANTZ) genotypes for resistance to African root and tuber scale
(Stictococcus vayssierei Richard) in
different Agro-ecological zones of Beni (North Kivu, DR Congo). International
Journal of Innovation and Applied Studies 16: 247-259.


Ngeve JM (2003). The cassava root mealybug
(Stictococcus vayssierei Richard)
(Homoptera: Stictococcidae): a threat to cassava production and utilization in
Cameroon, International Journal of Pest Management 49: 327-333.


Nonveiller G (1984). Catalogue des insectes du Cameroun d’intérêt
Beograd: Institut pour la Protection des
Plantes, Mémoires XV.


Prüter C and Zebitz CPW (1991). Effects of
Aphis fabae and Urumyces
viciae-fabaeon the growth of a susceptible and an aphid resistant cultivar of Vicia faba. Ann. appl. Biol., 119:


Rwegasira GM. and Rey CME (2012). Response
of selected cassava varieties to incidence and severity of cassava brown streak
disease in Tanzania.
Journal of Agricultural Science, 4 (7): 237-245.


Renard F et Foucart G (2008). Les maladies foliaires de la fin de
végétation en culture de maïs. CIPF-Centre pilote en culture de maïs.
Laboratoire d’Ecophysiologie et d’Amélioration Végétale. UCL-Louvain-la-Neuve.
6 p.


Richard C (1971). Contribution à l’étude morphologique et
biologique des Stictococcinae [Hom. Coccoidea]. Annales de la Société
Entomologique de France 7: 571–609.


Schulthess F, Baumgartner JU Delucchi V
and Gutierrez AP (1991). The influence of the cassava mealybug, Phenacoccus manihoti Mat.-Ferr. (Hom.,
Pseudococcidae) on yield formation of cassava, Manihot esculenta Crantz. Journal of Applied Entomology 111:


Tata-Hangy K, Hanna R, Toko M, Lema KM,
Solo M (2006). Changes in population abundance of the African root and tuber
scale Stictococcus vayssierei Richard
(Homoptera; Stictococcidae) on cassava in the bas-fleuve district in the
Democratic Republic of Congo. In: Mahungu N.M., Manyong V.M., editors. Advances
in Root and Tuber Crops Technologies for Sustainable Food Security, Improved
Nutrition, Wealth and Environmental Conservation in Africa. Proceedings of 9th
ISTRC-AB Symposium Mombassa, Kenya. 574-582.


Tchumakov EE et Zaharova I.I (1990). Influence
et statistique du développement des maladies. In : dommages causées par les maladies aux cultures agricoles. Edition
Agroprome, Moscou, pp 5-60.


Tertuliano M, (1993). 
Résistance du manioc à la cochenille farineuse Phenacoccus manihoti (Homoptera : Pseudococcidae) : rôles de
quelques composés chimiques foliaires. Thèse de doctorat. Université de Rennes
1. 85 p.


Tindo M, Hanna R, Goergen G, Zapfack L, Tata-Hangy K, Attey A (2009).
Host plants of Stictococcus vayssierei Richard (Stictococcidae) in non-crop
vegetation in the Congo Basin and implications for developing scale management
options, International Journal of Pest Management, 55 (4): 339-345.


Tindo M, Doumtsop A, Goergen G and Hanna R
(2006). Morphological description and illustration of female developmental
stages of Stictococcus vayssierei
(Homoptera: Stictococcidae). International Journal of Tropical Insect Science.
26 (2): 126-133.


Westphal E (1985). Cultures vivrières tropicales avec référence
spéciale au Cameroun.
Wageningen-Nertherlands. pp. 119-163


Williams DJ, Matile-Ferrero D and Miller
DR (2010). A study of some species of the genus Stictococcus Cockerell (Hemiptera: Sternorryncha: Coccoidea:
Stictococcidae), and a discussion on Stictococcus
Richard a species injurious cassava in Equatorial Africa with a
description of a new species from Nigeria. Zootaxa. 2527: 1-27.


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



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