Selectivity of deltamethrin doses on Palmistichus elaeisis (Hymenoptera: Eulophidae) parasitizing Tenebrio molitor (Coleoptera: Tenebrionidae)

Abstract

insecticides are the main method of controlling lepidopteran pests of eucalyptus plantations and those selective to natural enemies, such as the endoparasitoid Palmistichus elaeisis Delvare et LaSalle (Hymenoptera: eulophidae), are preferable. the objective of this study was to evaluate the selectivity and effects on biological parameters of the insecticide deltamethrin, registered for the control of defoliator caterpillars of eucalyptus, to the parasitoid P. elaeisis aiming the rational use of this insecticide and its compatibility with parasitoids. the experiment was in a completely randomized design. The treatments were the doses of 0.

Selectivity of Insecticides to a Pupal Parasitoid, Trichospilus diatraeae (Hymenoptera: Eulophidae), of Soybean Caterpillars

“…However, acephate is an organophosphate from a group of insecticides, generally with a broad spectrum and low selectivity, causing high mortality of parasitoids [ 35 ]. The lethal effects of the residues of deltamethrin [ 36 ] cause reduced survival of the parasitoid T. diatraeae after 120 h. This is similar to that reported for Trichopria anastrephae Lima, 1940 (Hymenoptera: Diapriidae), with a mean survival of 10% after 120 h of exposure to this insecticide, and Pachycrepoideus vindemmiae (Rondani, 1875) (Hymenoptera: Pteromalidae) with 100% mortality [ 27 ]. However, deltamethrin did not reduce P. elaeisis survival [ 36 ].…”

“…The lethal effects of the residues of deltamethrin [ 36 ] cause reduced survival of the parasitoid T. diatraeae after 120 h. This is similar to that reported for Trichopria anastrephae Lima, 1940 (Hymenoptera: Diapriidae), with a mean survival of 10% after 120 h of exposure to this insecticide, and Pachycrepoideus vindemmiae (Rondani, 1875) (Hymenoptera: Pteromalidae) with 100% mortality [ 27 ]. However, deltamethrin did not reduce P. elaeisis survival [ 36 ]. The reduced T. diatraeae survival rate with thiamethoxam + lambda-cyhalothrin is due to its toxicity as reported for the mortality of all Telenomus podisi Ashmead, 1893 (Hymenoptera: Platygastridae) individuals due to direct contact with insecticide residues [ 37 ].…”

Sublethal exposure to deltamethrin stimulates reproduction and has limited effects on post-hatching maternal care in the European earwig

“…Similarly, in several parasitoid wasps, deltamethrin impairs females' fecundity, larval development, but also behavioural processes such as sex pheromone discrimination, finding of the host location and walking (Salerno et al 2002;Bayram et al 2010;Delpuech et al 2012;Delpuech and Delahaye 2013;Oliveira et al 2018;Teder and Knapp 2019;Pereira Costa et al 2020).…”