Boric acid for suppression of the ant Anoplolepis tenella and effects on an associated scale insect pest Stictococcus vayssierei in cassava fields in the Congo Basin

The scale insect, Stictococcus vayssierei, is one of the major pests and constraints to cassava production in the Congo Basin. It is frequently found associated with the ground nesting ant, Anoplolepis tenella, under cassava plant. Amdro fire ant bait granules (contains 7.3 g/kg Hydramethylnon), borax and boric acid solution were evaluated in the laboratory for toxicity against A. tenella colonies. Workers were exposed to bait for ten days during primary screening and colonies for six weeks during secondary screening. Mortality was recorded daily for each toxicant. In a field experiment, the effect of a 1% boric acid-sucrose solution was evaluated on A. tenella and its impact on the density of S. vayssierei on cassava. Each of the three toxicants displayed delayed toxicity with less than 15% mortality after the first day. In comparison to Amdro and borax, the 1% boric acid-sucrose solution was more effective in killing ant workers. The boric acid-sucrose solution reduced the numbers of workers and brood by 90% within 6 weeks. In the field experiment, monthly ant and scale sampling showed significant reductions in ant density in treated fields which resulted in a reduction of scale infestation on cassava. We recorded a 16% yield increase in treated plots compared to control plots. These results outline the dependence of S. vayssierei survival on A. tenella attendance and demonstrate that control of the ant in cassava fields can help in developing control options for the scale insect pest in the Congo Basin.

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Field Value
Creator Fotso Kuate, Apollin
Creator Affiliation International Institute of Tropical Agriculture (IITA)
Creator ID Type ORCID
Creator ID 0000-0002-5247-7519
Subject Vocab (AGROVOC/GACS/CAB) Pest Control,Ants,Cassava,Borax,Boric acid,Workers,Colony,Scale insect,Insects
Subject(s) Pest Control,Anoplolepis tenella,Amdro fire ant bait
Publisher International Institute of Tropical Agriculture (IITA)
Contributor Person Hanna, Rachid; Tindo, Morris; Nanga, Samuel
Contributor Role Other
Contributor Project Lead Organisation Center International Institute of Tropical Agriculture (IITA)
Contributor Project Lead Center International Institute of Tropical Agriculture (IITA)
Contributor CRP CGIAR Research Program on Roots, Tubers and Banana(RTB)
Contributor Partner Not Applicable
Contributor Donor Research Fellow Partnership Program (RFPP), International Fund for Agricultural Development (IFAD)
Contributor Project Toward Sustainable control options against the African root and tuber scale. Understanding the Biology on the associated ant Anoplolepis tenella in the Congo Basin
Contributor Affiliation International Institute of Tropical Agriculture (IITA)
Open-Access status Open Access
Production Date 2009-09-20
Embargo End Date
Content Type Dataset
File Format csv
Identifier Type DOI
Identifier https://doi.org/10.25502/tdhw-m205/d
Identifier Citation Hanna R, Fotso Kuate A, Nanga SN, Tindo M, Nagel P. 2015. Boric acid for suppression of the ant Anoplolepis tenella and effects on an associated scale insect pest Stictococcus vayssierei in cassava fields in the Congo Basin. Crop Prot 74(0):131-137. doi: https://dx.doi.org/10.1016/j.cropro.2015.04.016
Source Toward Sustainable control options against the African root and tuber scale. Understanding the Biology on the associated ant Anoplolepis tenella in the Congo Basin
Language English
Relation Not applicable
Agroecological Zone Humid warm tropics
Coverage Region Sub-Saharan Africa
Coverage country Cameroon,Democratic Republic of Congo,Equitorial Guinea,Gabon,Republic of the Congo
Coverage Admin Unit Not applicable
Coverage X 7.36972, -4.03833, 1.65080, -0.80369, -0.22802
Coverage Y 12.35472, 21.75866, 10.26789, 11.60944, 15.82766
Coverage Start Date
Coverage End Date 2009-09-20
Contact Fotso Kuate, Apollin; Visiting Scientist, International Institute of Tropical Agriculture (IITA)
Contact Email a.fotso@cgiar.org
Restriction CC-BY 4.0
Email Permission Not applicable
Rights CC-BY 4.0