Issues in Biological Sciences and Pharmaceutical Research

Original Research Article

Field and laboratory testing of new insecticides molecules against Spodoptera frugiperda (J. E. Smith, 1797) infesting maize in Benin

Gustave BONNI*1, Thomas A. HOUNDETE2, Emmanuel SEKLOKA1, Romaine ASSOGBA BALLE2 and O.K. DOURO KPINDOU3


1Institut National des Recherches Agricoles du Bénin/ Centre de Recherches Agricoles Coton et Fibres (INRAB/CRA-CF), Abomey-Calavi, Bénin, 01 BP 715 Cotonou.
2Institut National des Recherches Agricoles du Bénin/ Centre de Recherches Agricoles Coton et Fibres (INRAB/CRA-CF), Laboratoire d’entomologie de Cana, Bohicon.
3Institut International d’Agriculture Tropical (IITA), 08 BP 0932 Tri Postal, Cotonou, Bénin.

*Corresponding Author E-mail : gustavebonni@yahoo.fr

Tel. (+229) 97 44 96 09

Gustave BONNI

Thomas A. HOUNDETE

Emmanuel SEKLOKA

Romaine ASSOGBA BALLE

O.K. DOURO KPINDOU


Article Number: ibspr.20.008  |   Pages: 65-71  |   Vol. 8 (4), September 2020   |   DOI: https://doi.org/10.15739/ibspr.20.008

 Received: May 15, 2020  Accepted: August 3, 2020  Published: September 11, 2020

Abstract

Fall armyworm, (FAW, S. frugiperda) is a prime noctuid pest of maize on the American continents. The pest has currently become a new invasive species in West Africa, especially in Benin. In order to limit the use of non-registered synthetic insecticides on food crops, with its consequences on man’s health and environment, the effect of some semi-organic and botanical insecticides was evaluated on S. frugiperda on maize, in a comparative test with synthetic insecticides registered for food crops. The two synthetic insecticide formulations contained Lambda cyhalothrin 15 g/l-Acetamiprid 10 g/l and the other one of Indoxacarb 50 g/l. The other semi-organic and botanical formulations contained Spinetoram 120 g/l, Azadirachtin 0.35 g/l and Emamectin benzoate 19.2 g/l. The experiment was carried out in the Entomology Laboratory of Cana (Benin) and in the maize fields in Sékou (South area Benin), Alafiarou (North-South area Benin) and in Gogounou (North area Benin). The two synthetic insecticide formulations used were Lambdace 25 EC (Lambda-cyhalothrin 15g/l-Acetamipride 10 g/l) and Indoxan 50 EC (Indoxacarb 50g/l). The semi-organic formulations used were Radiant 120 SC (Spinetoram 120 g/l), Ema 19.2 EC (Emamectin benzoate 19.2 g/l) and the botanical formulation was Neem (Azadirachtin 0.35 g/l). The laboratory tests were conducted following a Fisher bloc design with an untreated control with four (4) replicates. Each replicate consisted of ten (10) caterpillars weighing between 35 and 45 mg and placed individually in a Petri dish. Mortality was assessed at 24, 48 and 72 hours after application of the different molecules. In the field, the design was a Fisher block with six (6) treatments and four (4) repetitions with elementary plots of eight (8) rows of 9m, of which six (6) rows were treated. Three phytosanitary applications were made just after the first observation at the 2-3 leaf stage. The insecticide applications were carried out every 14 days with a Solo 425 backpack device. The results showed higher mortality rates in laboratory with Emamectin benzoate (94.16 ± 2.6%), Azadirachtin (80 ± 9.3%) and Spinetoram (79.16 ± 4.91%). In the field, Spinetoram proved to be the most effective with a reduction rate of 70.77% of maize plants attacked, followed by Emamectin benzoate (54.86%) and Azadirachtin (36.36%). This study indicates that these active ingredients could be used in an integrated management system for S. frugiperda caterpillars.

Keywords:

Efficiency, spinetoram, emamectin, azadirachtin, Spodoptera frugiperda, maize.

How to Cite this Article

Bonni G, Houndete TA, Sekloka E, Assogba-Balle R, Douro-Kpindou OK(2020). Field and laboratory testing of new insecticides molecules against Spodoptera frugiperda (J. E. Smith, 1797) infesting maize in Benin.Issues Biol. Sci. Pharma. Res. 8(4):65-71.

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