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Arthropod pest complex and associated damage in field-grown tomato in Senegal

Published online by Cambridge University Press:  25 July 2018

Mamadou Diatte*
Equipe Production et Protection Intégrées en Agroécosystèmes Horticoles (2PIA), Faculté des Sciences et Techniques (FST), Université Cheikh Anta Diop de Dakar (UCAD), Dakar, Senegal Centre pour le Développement de l'Horticulture (CDH), Institut Sénégalais de Recherche Agricole-(ISRA), Dakar, Senegal
Thierry Brévault
Biologie des populations et écologie des communautés animales des écosystèmes naturels et anthropisés sahélo-soudaniens (BIOPASS), CIRAD-IRD-ISRA-UCAD, Dakar, Senegal Centre de coopération internationale en recherche agronomique pour le développement (CIRAD), Unité de rechercheAgroécologie et intensification durable des cultures annuelles (UPR AIDA), F-34398 Montpellier, France
Serigne Sylla
Equipe Production et Protection Intégrées en Agroécosystèmes Horticoles (2PIA), Faculté des Sciences et Techniques (FST), Université Cheikh Anta Diop de Dakar (UCAD), Dakar, Senegal
Etienne Tendeng
Equipe Production et Protection Intégrées en Agroécosystèmes Horticoles (2PIA), Faculté des Sciences et Techniques (FST), Université Cheikh Anta Diop de Dakar (UCAD), Dakar, Senegal
Dienaba Sall-Sy
Centre pour le Développement de l'Horticulture (CDH), Institut Sénégalais de Recherche Agricole-(ISRA), Dakar, Senegal
Karamoko Diarra
Equipe Production et Protection Intégrées en Agroécosystèmes Horticoles (2PIA), Faculté des Sciences et Techniques (FST), Université Cheikh Anta Diop de Dakar (UCAD), Dakar, Senegal
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Biotic factors (including insect pests) constrain field-grown tomato production in Senegal. However, little information is available on the identity and life system of key pests. The objectives of this study were to: (i) update key pest records of field-grown tomato in the central vegetable-producing area along the northern coast of Senegal, known as the Niayes area; (ii) map their spatial and temporal incidence and (iii) understand insecticide use by growers to control the pests. A total of 98 tomato fields distributed in three zones along a north–south transect in the Niayes area were monitored over four crop cycles from 2012 to 2014. As expected, the tomato fruitworm Helicoverpa armigera Hübner (Lepidoptera: Noctuidae) was the most destructive pest with an occurrence of 92% in sampled fields (90/98) and up to 38% damaged fruits in one field at the time of sampling. The proportion of damaged fruits did not differ among zones, but was significantly higher in the early dry season compared to the late dry season. The invasive tomato leafminer Tuta absoluta Meyrick (Lepidoptera: Gelechiidae) was detected in 53% of sampled fields (52/98), mainly in the south of the Niayes area in the late dry season. Because of their ability to adapt to unstable environment and insecticides, this insect pest assemblage is a new challenge that farmers have to deal with while decreasing their use of broad-spectrum insecticides.

Research Paper
Copyright © icipe 2018 

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