Crop genotype and stem cutting portion affect infestation pressure of the cassava root scale Stictococcus vayssierei Richard (Hemiptera: Stictococcidea) in a rainforest in Cameroon

Abstract

African root and tuber scale (ARTS) Stictococcus vayssierei Richard is a serious constraint to the production of cassava (Manihot esculenta Crantz) in Central Africa, and the food and income security for smallholder farmers. Therefore, to improve the production of cassava it is urgent to determine the appropriate cultural practices that lower ARTS infestation pressure. This study tests the single and combined effects of stem cutting portion and crop variety on ARTS infestation levels’. A split-plot design with four cassava varieties (TMS 96/0023, Excel, Miboutou and Douma) as the main plots and three stem cuttings portions of these varieties (lower, middle and upper portions of the mother plant) as sub-plots was used. The results showed that at 12 months after planting (MAP), lower portions of the local variety Douma showed the highest fresh shoots (2.95 ± 0.13 kg) than the upper portions (2.08 ± 0.09 kg) of the Excel variety. The portions at lower of the Excel variety were the most infested (118-158.38 and 126.75 ARTS) at 3, 6 and 9 MAP respectively. The yield of local variety Douma was higher (20.00-20.11 t ha− 1) in plots planted with portions at middle and lower, followed by yields of TMS 96/0023 variety (19.00 t ha− 1) in plots planted with the lower portions. Overall, irrespective of the cassava variety, the lower portion 16.49 t ha− 1 resulted in higher yield than those the upper portion 10.81 t ha− 1.

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Acknowledgements

The authors are sincerely thankful to the International Institute of Tropical Agriculture and the Institute of Agricultural Research for Development for planting material provision. The authors also wish to thank Dr. Pierre EKE for his valuables comments and suggestions on this manuscript.

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Correspondence to Patrice Zemko Ngatsi.

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Appendix

Appendix

Table 5 Effect of cassava variety on fresh shoot weight (kg)
Table 6 Effect of cuttings portions of stem on fresh shoot weight (kg)
Table 7 Effect of cassava variety on stem collar diameter (cm)
Table 8 Effect of cuttings portions of stem on stem collar diameter (cm)
Table 9 Effect of cassava variety on number of cassava root scale
Table 10 Effect of cuttings portions of stem on number of cassava root scale
Table 11 Effect of cassava variety on yield (t ha-1)
Table 12 Effect of cuttings portions of stem on yield (t ha-1)

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Ngatsi, P.Z., Ndongo, B., Kutnjem, D. et al. Crop genotype and stem cutting portion affect infestation pressure of the cassava root scale Stictococcus vayssierei Richard (Hemiptera: Stictococcidea) in a rainforest in Cameroon. Phytoparasitica (2020). https://doi.org/10.1007/s12600-020-00823-6

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Keywords

  • Manihot esculenta
  • Scale insect
  • Cuttings portions
  • Varieties
  • Yield