Journal of Economic Entomology (2005) 98, 35-40

Moosa Saber, Mir Jalil Hejazi, Karim Kamali and Saeid Moharramipour (2005)
Lethal and sublethal effects of fenitrothion and deltamethrin residues on the egg parasitoid Trissolcus grandis (Hymenoptera: Scelionidae)
Journal of Economic Entomology 98 (1), 35-40
Abstract: Effects of fenitrothion and deltamethrin, the most commonly used insecticides in Iran for controlling Eurygaster integriceps Puton (Heteroptera: Scutelleridae), in wheat and barley were assessed on adults and preimaginal stages of egg parasitoid Trissolcus grandis Thompson (Hymenoptera: Scelionidae). Adult parasitoids exposed to field recommended concentrations of the insecticides suffered 100% mortality within 24 h. LC₅₀ values of fenitrothion and deltamethrin for T. grandis were 8.1 and 3.9 µg (AI)/ml, respectively. Both insecticides and the preimaginal stage of exposure had a significant influence on the level of adult emergence from host eggs treated with field recommended rates. Fenitrothion and deltamethrin reduced the emergence rates by 18 and 34.4%, respectively, compared with the control. However, neither insecticide significantly affected the longevity or reproductive capacity of emerged females, or the sex ratio of their progeny. This study revealed that application of these insecticides should be avoided in early season to conserve natural or released populations of T. grandis. Both insecticides seemed to be detrimental to the parasitoid and need to be applied cautiously through season.
(The abstract is excluded from the Creative Commons licence and has been copied with permission by the publisher.)
Link to article at publishers website
Database assignments for author(s): Saeid Moharramipour, Moosa Saber, Mir Jalil Hejazi

Research topic(s) for pests/diseases/weeds:
biocontrol - natural enemies
health/environmental effects of pesticides
Research topic(s) for beneficials or antagonists:
resistance to pesticides

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Pest and/or beneficial records:

Beneficial	Pest/Disease/Weed	Crop/Product	Country	Quarant.
	Eurygaster integriceps		Iran
Trissolcus semistriatus (parasitoid)	Eurygaster integriceps		Iran