Herança da resistência de Spodoptera frugiperda (J.E. Smith) (Lepidoptera: Noctuidae) a lambda-cialotrina

Abstract

-Inheritance of lambda-cyhalothrin resistance in Spodoptera frugiperda (J.E. Smith) was investigated in a strain of S. frugiperda showing an intensity of resistance of approximately 13-fold. Results from reciprocal crosses between susceptible (S) and resistant (R) strains of S. frugiperda to lambda-cyhalothrin revealed that resistance was autossomal and conferred by an incompletely recessive gene. Then, backcrosses of F 1 progenies to the R strain were performed to determine the number of genes involved in the resistance. From interpretation of chi-square analysis of responses of progenies from backcrosses suggested that the resistance was conferred by a single major gene under a influence of some minor genes.KEY WORDS: Insecta, fall armyworm, corn, genetics of resistance, pyrethroid.RESUMO -A herança da resistência de Spodoptera frugiperda (J.E. Smith) ao piretróide lambdacialotrina foi determinada para uma linhagem de S. frugiperda apresentando uma intensidade de resistência de aproximadamente 13 vezes. Resultados dos cruzamentos recíprocos entre as linhagens suscetível (S) e resistente (R) de S. frugiperda à lambda-cialotrina revelaram que a resistência era de caráter autossomal e incompletamente recessivo. Posteriormente, foram conduzidos retrocruzamentos da progênie F 1 (heterozigota) com o parental resistente para determinar o números de genes envolvidos na resistência. Mediante análise do teste do qui-quadrado das respostas das progênies dos retrocruzamentos à lambda-cialotrina sugere-se que a resistência seja determinada por um gene principal sob a influência de genes secundários. PALAVRAS-CHAVE: Insecta, lagarta-do-cartucho, milho, resistência a inseticidas, piretróide.

Selection and characterization of the inheritance of resistance of Spodoptera frugiperda (Lepidoptera: Noctuidae) to chlorantraniliprole and cross‐resistance to other diamide insecticides

“…the resistance loci are in autosomal chromosomes. As in most cases of insecticide resistance, other studies have reported autosomal resistance of S. frugiperda , to lambda‐cyhalothrin, carbaryl, lufenuron and spinosad . For the diamide insecticides, the resistance of P. xylostella and T. absoluta was characterized as autosomal and incompletely recessive dominance …”

“…Chemical control has been one of the main management strategies for S. frugiperda , but this armyworm has developed resistance to the main chemical groups including pyrethroids (lambda‐cyhalothrin), carbamates (carbaryl) and organophosphates (chlorpyriphos), as well as more recently developed chemical groups such as benzoylurea (lufenuron) and spinosyn (spinosad) . In addition, due to the wide adoption of transgenic plants expressing Bacillus thuringiensis Berliner proteins (Bt plants), cases of S. frugiperda resistance to Bt proteins are already reported in Brazil .…”

Detection of a ryanodine receptor target‐site mutation in diamide insecticide resistant fall armyworm, Spodoptera frugiperda

“…Such a treatment frequency is conducive to the development of insecticide resistance in FAW, so it is not surprising that high levels of resistance to several chemical classes of insecticides have been reported recently in Puerto Rico . In Brazilian populations of FAW, resistance to a range of synthetic insecticides, addressing different modes of action, including organophosphates, carbamates, pyrethroids, benzoylureas and spinosyns, has been also described …”

Investigating the Molecular Mechanisms of Organophosphate and Pyrethroid Resistance in the Fall Armyworm Spodoptera frugiperda

“…The high infestation rate of S. frugiperda and the major economic losses it causes has led to a reliance on intensive application of chemical insecticides for control. Unfortunately the widespread and sometimes indiscriminate use of insecticides has contributed to the development of populations with resistance to several different insecticide classes including organophosphates, carbamates, pyrethroids and benzoylureas [4], [5], [6], [7].…”

“…Resistance has also been observed in laboratory-selected populations which have been described with resistance ratios of more than 40-fold to a given pyrethroid compound [9]. In Brazil, resistance to pyrethroids has also been reported in S. frugiperda with a population described with resistance ratios of approximately 13-fold to lambda-cyhalothrin [4].…”