Variation in biological parameters of cypermethrin resistant and susceptible strains of <em>Helicoverpa armigera</em> from Benin Republic, West Africa

Abstract

The aim of this survey was to assess the costs of cypermethrin resistance in Helicoverpa armigera strains by using variation in their biological parameters such as fecundity, number of larval slough, development time, weight and survival at each stage of insect development in comparison with susceptible strains. AGB01 and AGB03 are the resistant strains compared respectively with BK77 and OKP01 as susceptible strains. Fecundity, fertility and survival from egg to adult emergence of AGB03 strain were significantly (P < 0.001) lower than those observed in OKP01 strain. No difference (P > 0.05) was observed with time of pre-adult development, survival at each stage of insect development, fecundity and number of larval slough in comparison with AGB01 and BK77 strains. Larvae of AGB01 strain took significantly (P < 0.01) longer time to develop and were significantly (P < 0.01) lighter than BK77 at the same age, but the slower development of larvae of AGB01 strain was counteracted by the shorter times of egg and pupae stages. The lower fecundity, fertility and survival from egg to adult emergence should represent the main costs for the AGB03 strain resistant to cypermethrin.

Réduction de doses de cyperméthrine- triazophos et lutte raisonnée en culture cotonnière au Bénin

“…La pleine dose de cyperméthrine appliquée durant plusieurs années en Afrique de l'Ouest et du Centre en général et au Bénin en particulier a entraîné l'apparition de la résistance de H. armigera aux pyréthrinoïdes dans ces régions (Martin et al, 2005 ;Djihinto et al, 2009Djihinto et al, et 2012Achaleke et Brévault, 2010). La lutte raisonnée expérimentée en culture cotonnière au Bénin à l'instar de la lutte étagée ciblée, la lutte sur seuil, la lutte après observation individuelle des chenilles appliquées en Afrique de l'Ouest et du Centre visant à réduire la dose d'insecticide épandu (Silvie et Sognigbe, 1993;Vodounnon, 1995;Nibouche et al, 2003;Sinzogan et al, 2004;Prudent et al, 2007;Silvie et al, 2011Silvie et al, et 2013Kpadé et Mensah, 2013;Brévault et al, 2014 ) est une stratégie de réduction de la pression de sélection insecticide et un outil de prévention et de gestion de la résistance des insectes aux insecticides (Djihinto, 2004;Djihinto et al, 2009Djihinto et al, et 2013.…”

Insecticide resistance in field populations of the tomato fruitworm, <i>Helicoverpa armigera</i>, from Senegal

“…Pyrethroid and organophosphate insecticides have been widely used by both cotton and tomato growers on account of their efficacy in controlling a wide range of pests at low doses and at extremely low cost (Badiane et al, 2015). As a result, resistance to pyrethroids occurred during the mid-1990s in H. armigera populations from West Africa (Martin et al, 2000;Djihinto et al, 2012). Resistance led to the wide adoption of a new spraying program based on the temporary exclusion of pyrethroids (Martin et al, 2005).…”

Molecular identification of <i>Helicoverpa armigera</i> (Hubner) associated with tomatoes (<i>Solanum lycopersicum L.</i>) in Ogun State

“…It has been reported that H. armigera has high movement and productiveness and it also revealed a great capability to develop resistance to insecticides used for its control (Ramasubramaniam and Regupathy, 2004). The cosmopolitan and polyphagous nature of the insect makes it have a wide host range and geographical distribution with the ability to adapt to new environments (Djihinto, 2012). H. armigera was reported to possess the ability to migrate from one fruit to the other without fully consuming it; and this explains the widespread damage of the insect to crops even when the larvae population is low (Zalucki et al, 1986).…”