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Spatial and temporal incidence of insect pests in farmers’ cabbage fields in Senegal

Published online by Cambridge University Press:  04 September 2017

Babacar Labou ,
Thierry Brévault ,
Serigne Sylla ,
Mamadou Diatte ,
Dominique Bordat  and
Karamoko Diarra
Babacar Labou
Affiliation:
UCAD, Equipe Production et Protection Intégrées en Agroécosystèmes Horticoles - 2PIA, 6 Faculté des Sciences et Techniques, Dakar, Senegal
Thierry Brévault*
Affiliation:
BIOPASS, ISRA-UCAD-IRD-CIRAD, Dakar, Senegal CIRAD, UPR AIDA, F-34398, Montpellier, France
Serigne Sylla
Affiliation:
UCAD, Equipe Production et Protection Intégrées en Agroécosystèmes Horticoles - 2PIA, 6 Faculté des Sciences et Techniques, Dakar, Senegal BIOPASS, ISRA-UCAD-IRD-CIRAD, Dakar, Senegal
Mamadou Diatte
Affiliation:
UCAD, Equipe Production et Protection Intégrées en Agroécosystèmes Horticoles - 2PIA, 6 Faculté des Sciences et Techniques, Dakar, Senegal
Dominique Bordat
Affiliation:
UCAD, Equipe Production et Protection Intégrées en Agroécosystèmes Horticoles - 2PIA, 6 Faculté des Sciences et Techniques, Dakar, Senegal
Karamoko Diarra
Affiliation:
UCAD, Equipe Production et Protection Intégrées en Agroécosystèmes Horticoles - 2PIA, 6 Faculté des Sciences et Techniques, Dakar, Senegal
*
*E-mail: [email protected]
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Abstract

In Senegal, damage caused by insect pests is a major obstacle to seasonal stability and an increase in cabbage production. Little is known about the spatial and temporal distribution of cabbage pests, which makes the design of management recommendations to small-scale farmers challenging. The objectives of this study were to: (i) evaluate the status of insect pests observed in cabbage farmers’ fields; (ii) give information on the spatial and temporal distribution of key pests and (iii) assess the effect of temperature, insecticide applications, and host crop abundance on their incidence. A total of 116 cabbage fields were monitored for insect pests and related damage over four crop cycles, from October 2012 to May 2014, in the main vegetable producing area of Senegal (Niayes). The diamondback moth Plutella xylostella (L.) was by far the most important pest present in all the fields and with high levels of incidence (37.1% infested plants), particularly in the latter part of the dry season in the South of Niayes (50% infested plants). The cabbage webworm Hellula undalis (F.) was mainly observed in the early dry season in the south of Niayes, with an incidence of up to 12.5% infested plants. More surprising was the detection of the tomato fruit worm Helicoverpa armigera (Hübner), with damage of up to 9.4% of cabbage heads. The incidence of sucking pests such as whiteflies Bemisia tabaci (Gennadius), or aphids (including Lipaphis pseudobrassicae (Davis, 1914), Myzus persicae (Sulzer) or Brevicoryne brassicae (L.)) was generally low. The incidence of P. xylostella increased significantly with the number of insecticide applications, indicating that control deployed by growers was ineffective. The incidence of H. undalis did not depend on the number of insecticide applications, but significantly increased with host crop abundance and decreased with temperature. This study is a first step towards developing alternative pest management strategies in the framework of sustainable vegetable production systems.

Keywords

population dynamicsdiamondback mothcabbage webwormBrassicaceaeWest Africa
Type
Research Paper
Information
International Journal of Tropical Insect Science , Volume 37 , Issue 4 , December 2017 , pp. 225 - 233
Copyright
Copyright © icipe 2017 

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