Novel rearing technique, developmental biology, fecundity and morphometrics of the brown cocoa mirid Sahlbergella singularis Haglund in Nigeria

Anikwe J.C., Omoloye A.A., Okelana F.A., Babin Régis. 2010. Novel rearing technique, developmental biology, fecundity and morphometrics of the brown cocoa mirid Sahlbergella singularis Haglund in Nigeria. In : 16th International Cocoa Research Conference. Proceedings : towards rational cocoa production and efficient use ofr a sustainable world cocoa economy = 16e Conférence internationale sur la recherche cacaoyère.Actes ; 16 Conferencia Internacional de Pesquisas em Cacau. Actas ; 16 Conferencia Internacional de investigacion en cacao. Actas : vers une économie cacaoyère durable : quelles stratégies d'approche ? ; para uma produção racional de cacau e o seu uso eficiente para uma economia mundial sustentada do cacau ; hacia una produccion racional y un uso eficiente del cacao para la sustentabilitd. Lagos : Cocoa Producers' Alliance, 1103-1111. ISBN 978-065-959-5 Conférence Internationale sur la Recherche Cacaoyère. 16, Bali, Indonésie, 16 Novembre 2009/21 Novembre 2009.

Titre espagnol : Morfometría del mírido pardo del cacao, Sahlbergella singularis Haglund (Hemiptera:Miridae) en Nigeria / Titre portugais : Novas técnicas de criação, biologia do desenvolvimento, fecundide e morfometria do mirídio castanho do cacau Sahlbergella singularis Haglund na Nigéria / Titre français : Nouvelles techniques d'élevage, biologie du développement, fécondité et morphométrie de la miride brune du cacaoyer sahlbergella singularis Haglund (Hemiptera: Miridaei) au Nigeria

Résumé : The brown cocoa mirid, Sahlbergella singularis is the major insect pest of cocoa in Nigeria capable of causing up to 80% yield loss. This study described a new rearing technique for mass culture and aspects of the laboratory and field biology of the insect. The rearing technique involved two phases in which day old nymphs were collected from the field and transferred into the specially fabricated rearing chamber (300cm x 200cm x 240cm) made of plywood with installed temperature regulating unit of 22 - 240C and humidifier with Relative Humidity of 85 ± 5%. The insect was reared using this new technique. Adult gravid females from the growth chamber were then confined in the field on cocoa trees under natural conditions for the purpose of egg laying and thereafter pods containing eggs and emergents were plucked and taken into the rearing chambers for biological studies. Each life stage was collected, measured and described. The nymphal instars were clearly separated on the basis of the cast-off exuviae. The life cycle from egg to adult lasted an average of 41.1 days while the egg incubation period was 31.3% of the total developmental time. There were five nymphal instars with total mean duration of 27 days. There were significant differences in the body morphometrics of each of the life stages (P>0.05). The sex ratio of male to female was 1:1.03. The potential fecundity of S. singularis was 42.20 ± 4.96 from dissected gravid female whereas the mean actual fecundity from mated females was 37.90 ± 3.09. The breakthrough in the continuous cultures of S. singularis therefore makes homogenous populations of mirids to be available for intensive laboratory bioassays. Moreover, it facilitated indepth knowledge of the biology of the pest which is basic for the development of an efficient and ecologically sound management strategy. (Texte intégral)

Mots-clés Agrovoc : Theobroma cacao, Sahlbergella, Miridae

Mots-clés géographiques Agrovoc : Nigéria

Mots-clés complémentaires : Sahlbergella singularis

Classification Agris : H10 - Ravageurs des plantes

Auteurs et affiliations

• Anikwe J.C., CRIN (NGA)
• Omoloye A.A., University of Ibadan (NGA)
• Okelana F.A., CRIN (NGA)
• Babin Régis, CIRAD-BIOS-UPR Bioagresseurs de pérennes (CMR) ORCID: 0000-0002-3753-1193

Source : Cirad - Agritrop (https://agritrop.cirad.fr/554237/)

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