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Field evaluation of the impact of Sahlbergella singularis Haglund infestations on the productivity of different Theobroma cacao L. genotypes in the Southern Cameroon

Mahob R.J., Feudjio Thiomela R., Dibog L., Babin R., Fotso Toguem Y.G., Mahot H., Baleba L., Owona Dongo P.A., Bilong Bilong C.F.. 2019. Journal of Plant Diseases and Protection, 126 (3) : p. 203-210.

Mirids (Sahbergella singularis and/or Distantiella theobroma) are the major pests of cacao farms in Africa. Cocoa production losses due to these species have been widely documented in West Africa. However, their impact on cocoa production is unknown in Central Africa, especially in Cameroon. Moreover, no data are available on the threshold level of fruits tolerance to mirid attacks. For these reasons, we assessed the effect of S. singularis on the productivity of ten cacao genotypes as well as the threshold number of the lethal feeding punctures to fruits under a randomized experimental design. Observations were made on three categories of fruits (cherelle, immature and mature/ripe). A control trial was also set up per batch. The overall results showed that 68.0% and 0.4% of fruits aborted, respectively, in mirid and control trials. The percentages of aborted fruits were significantly (p?

Mots-clés : expérimentation au champ; perte de récolte; génotype; résistance génétique; miridae; theobroma cacao; cameroun; sahbergella singularis

Thématique : Ravageurs des plantes; Génétique et amélioration des plantes

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