Effect of Some Insecticides on the Egg Parasitoid, Trichogramma evanescens Westwood (Hymenoptera: Trichogrammatidae)

Abstract

In this study, the effects of three insecticides including: Fenvalerate, Thiacloprid and Fenoxycarb on egg parasitoid, Trichogramma evanescens were investigated. The toxicity of insecticide were tested using two laboratory tests: (a) direct spray on Ephestia cautella eggs containing the parasitoid for effects on parasitism and emergence of the adult parasitoids (b) adult parasitoid exposure to dry insecticide films residue in glass vials. All insecticides were prepared according to the manufacturer's recommendations for field application. Results showed that these insecticides varied in toxicity and have different degrees of effect regarding the emergence and parasitism of the parasitoid. Fenoxycarb was non-toxic or low toxic to T. evanescen and did not affect immature stages development and adult emergence. Whereas, Fenvalerate was highly noxious to the parasitoid and significantly reduced the percentage of emergence and parasitism of T. evanescens developing in host eggs. The effects of Thiacloprid were slightly toxic to T. evanescens as it fell into the class 2 when parasitoids were directly exposed to chemical residues. While, Fenvalerate classified as moderately toxic and caused higher mortality than Fenoxycarb and Thiacloprid in both glass surface residues and direct spray of host eggs. Therefore, obtained data provided useful data for implementing both chemical and biological control strategies in integrated pest management.

Thiacloprid + deltamethrin against the cotton aphid and the parasitoid wasp Aphidius colemani: From lethal to sublethal population effects

“…colemani. In another study, thiacloprid was tested on Trichogramma evanescens (Westwood) (Hymenoptera: Trichogrammatidae) and reduced adult emergence and parasitism by this species, although other species of this genus may not be as strongly affected (Abdulhay & Rathi, 2014). Bastos et al (2006) The sublethal effects of insecticides on insect pests are an important consideration when selecting an insecticide.…”

Potential demographic impact of the insecticide mixture between thiacloprid and deltamethrin on the cotton aphid and two of its natural enemies

“…(2016) reported that thiacloprid + deltamethrin had the most negative impact on the life-table parameters of Lysiphlebus fabarum (Marshall) (Hymenoptera: Aphididae). In another study, Abdulhay and Rathi (2014) reported that thiacloprid reduced adult emergence and parasitism potency in Trichogramma evanescens (Westwood) (Hymenoptera: Trichogrammatidae).…”

Evaluation of safety of newer insecticides to immature stages of Trichogramma japonicum

“…However Ko et al, (2015) [11] reported thiamethoxam as "Slightly harmful" when treated at larval stage of Trichogramma with 33.2 reduction in adult emergence and also recorded 22.3 per cent reduction when treated with buprofezin after four days (larval stage) of parasitisation. Abdulhay et al, (2014) [1] observed thiacloprid as slightly harmful with 60.75 per cent reduction in adult emergence due to larvicidal and ovicidal activity with weaker adulticidal activity towards Trichogramma minutum. Madhusudhanan et al, (2014) [12] studied toxicity of flubendiamide 20 WG at 50, 60 and 70 g a.i.…”