The contact toxicity of indoxacarb and five other insecticides to Orius insidiosus (Hemiptera: Anthocoridae) and Aphidius colemani (Hymenoptera: Braconidae), beneficials used in the greenhouse industry

Abstract

The contact toxicity of indoxacarb, abamectin, endosulfan, insecticide soap, S-kinoprene and dimethoate to Orius insidiosus (Say) and Aphidius colemani Viereck were studied in the laboratory. These beneficials are often used in the greenhouses to manage various insect pests. Indoxacarb is slow acting and therefore, to estimate lethal dosages, observations should be continued for several days until data stabilize. Seven days after treatment, the LC50 was 0.119 g AI litre(-1) for O insidiosus adults and 0.019 g AI litre(-1) for A colemani. At that time, the recommended field concentration was 0.479 times the LC50 for O insidiosus adults and three times the LC50 for A colemani. In contrast, indoxacarb had no adverse effect on the reproductive capacity of wasps surviving a treatment or the developing wasps in the aphid mummy. Among the other insecticides S-kinoprene was the most innocuous while dimethoate was the most toxic to the two beneficials. The other insecticides had overlapping toxicities.

Laboratory evaluation of the side effects of insecticides on Aphidius colemani (Hymenoptera: Aphidiidae), Aphidoletes aphidimyza (Diptera: Cecidomyiidae), and Neoseiulus cucumeris (Acari: Phytoseidae)

“…Dinter and Wiles (2000) found also harmful effects of indoxacarb on A. colemani when mortality was evaluated after 48 h of exposure to dry residues on treated glass plates. In contrast, indoxacarb had no adverse effect on the reproductive capacity of wasps surviving a treatment (Bostanian and Akalach 2004). According to IOBC classification of insecticides (Table 3), acetamiprid showed great differences in toxicity according to species, ranging from harmless effect to N. cucumeris to harmful effect to A. colemani.…”

“…Similarly, no data have been published till present on the side effects of methoxyfenozide or acetamiprid against beneficial species from the family Aphidiidae. Inconsistent results have been published on the side effects of indoxacarb (Dinter and Wiles 2000;Bostanian and Akalach 2004) and spinosad Takahashi et al 2005) against Aphidiidae, azadirachtin A against Cecidomyidae (Spollen and Isman 1996) and pyridaben (Shipp et al 2000;Hardman et al 2006) and propargite (Shipp et al 2000) against Phytoseidae.…”

Topical and residual toxicity of six pesticides to Orius majusculus

“…Ashley et al 2006;Bakker et al 2000;Bostanian and Akalach 2004;Contreras et al 2006). Elzen (2001) reported 55-63% mortality of O. insidiosus females during egg-feeding bioassays using imidacloprid, spinosad or endosulfan.…”

“…Although acute responses in short-term tests can be substantial, toxicity during long-term exposures may be greater since continuous exposure promotes additional mortality, or cumulative effects require several days to be manifested, thus increasing the observed mortality after several days. Bostanian and Akalach (2004) evaluated toxicity of abamectin, endosulfan and other insecticides to O. insidiosus, with the insects being monitored for 1-9 days. Effects after a 1-d exposure to abamectin and endosulfan were similar to our results, with 44% and 8% mortality, respectively, in residue bioassays.…”

Assessment Of The Effects Of Time, Synthetic And Botanical Insecticides Spray Regimes On The Abundance Of Predators In Cowpea Production In Kebbi State Of Nigeria

“…Organophospahtes are toxic to Hymenopterans and few were found in the plots sprayed with commercial insecticide. Dimethoate is one of the constituents of the type of insecticide used, and in a contact toxicity test of many insecticides such as indoxacarb, endosulfan and dimethoate and three others on two beneficial insects one of which was a wasp (Aphidius colemani Viereck), dimethoate was found to be the most toxic [33]. Hymenopterans were abundant in the neem treated plots, especially where only two sprays were applied.…”