Diversity and spatial distribution of stem borers and their natural enemies on off season sorghum, Sorghum bicolour (L.) Moench (Poaceae), in the Sudano-sahelian zone of Cameroon

Millo_-_Sorghum_bicolor_03

Ngatanko Iliassa1, 2*, NgamoTinkeu S. Léonard2, Mapongmestsem Pierre Marie2

  1. Department of Biological Sciences, University of Maroua, Cameroon
  2. Department of Biological Sciences, University of Ngaoundéré, Cameroon

Abstract

Lepidopteran stem borers are among the most damaging insect pests of cultivated Poaceae in Africa. The objective of this study was to assess the diversity and the relative abundance of Lepidopteran stem borers and evaluate the larva-pupalparasitization in farmer’s fields. Surveys were conducted during two transplanted sorghum’ cropping seasons (2012/2013 and 2013/2014) in 3 agro-ecological sub-units in the Sudano-sahelian zone of Cameroon: Mandaras’ piedmonts (MP), Diamare plain (DP), Logon valley (LV). Destructive method was used to collect caterpillars and pupae from plants according to developmental stages of the sorghum this was followed by their identification. Pupae were reared under laboratory conditions and emerging insects were recorded. They were the expected moths or their parasitoids. During the two years, 180 fields were sampled. Three stem borers’ species (Lepidoptera: Noctuidae) were identified and the most abundant being SesamiacreticaLederer (68.27%), followed by S. poephaga (27.54%) and then S. calamistis (0.19%). It was also appeared that S. cretica and S. poephaga were present in sampled areas whereas, S. calamistisoccurred only at LV. Parasitoids species obtained belong to 3 Orders:Hymenoptera,Diptera and Coleoptera. The most important pupal parasitoid of the zone was Tetrastichussp (Hymenoptera: Eulophidae). Highest parasitization (17.15±14.59%) was recorded at MD followed by LV (14.15±7.42%) and the DP (11.19±0.69%). Tetrastichussp is a potential biological control agent of stem borers and could be used in integrated pest management process to prevent economic damage ofthe sorghum by the borers.

3a68dd729ba0c918569427313e3a3565 IJAAR 08Dec2015

Journal Name: International Journal of Agronomy and Agricultural Research (IJAAR)

Publication Name: International Network For Natural Sciences (INNSPUB)

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