During the past four decades, several species of aphidophagous Coccinellidae became established in North America, including Coccinella septempunctata, Harmonia axyridis, Hippodamia variegata, and Propylea quatuordecimpunctata. After their establishment, unknown circumstances favoured a rapid increase in population densities and distribution of H. axyridis and C. septempunctata at localities hun...

The coccinellid Harmonia axyridis is a recent arrival in the UK and is an intraguild predator of the entomopathogenic fungus Pandora neoaphidis. Harmonia axyridis entirely consumes P. neoaphidis-sporulating cadavers and this may have a negative effect on the epizootic potential of P. neoaphidis. Here we assessed within plant transmission, and between plant vectoring, of P. neoaphidis in the pre...

1. Pea aphids (Acyrthosiphon pisum Harris; Hemiptera: Aphididae) exhibit transgenerational wing polyphenism, in which unwinged females produce genetically identical winged offspring in response to environmental cues such as overcrowding and predation risk that indicate poor habitat quality. 2. Laboratory experiments were carried out to explore the intensity of the wing polyphenic response of pe...

Early-tier studies are the initial step in the environmental risk assessment of genetically engineered plants on nontarget arthropods. They are conducted in the laboratory where surrogate species are exposed to higher concentrations of the arthropod-active compound than those expected to occur in the Þeld. Thus, early-tier tests provide robust data and allow to make general conclusions about th...

Adipokinetic hormones (AKH) are synthesized in endocrine cells of the glandular corpora cardiaca, in the anterior part of the retrocerebral complex. AKH plays an important role in the metabolism of carbohydrates that fuel energydepleting activities such as flight and walking. To date, the primary sequences of eight isoforms from various beetle species have been elucidated. In this study, the gl...

Deltamethrin and imidacloprid are commonly used insecticides for controlling sub-sucking insects in greenhouses. However, their application may cause sublethal effects on the aphid coccinellid predator Coccinella septempunctata (Coleoptera: Coccinellidae). Here, we study (i) toxicity effect of two doses (LD10 LD30) deltamethrin C. a laboratory microcosm (ii) residual greenhouse. The results sho...

Toxicity of three modern insecticides (chlorantraniliprole, thiamethoxam and spinetoram) was examined against the first instar larvae of Pectinophora gossypiella (Saunders). The field rate and other two concentrations were used. The results showed that thiamethoxam was the most effective insecticide followed by chlorantraniliprole and spinetoram. The LC50,s were 8.9, 13.9 and 19 ppm for thiamet...

(1) Intraguild predation (IGP) can occur among aphidophagous predators thus reducing their effectiveness in controlling crop pests. Among ladybirds, Coccinella septempunctata L. and Hippodamia variegata Goeze are the most effective predators upon Aphis gossypii Glov., which is an economically important pest of melon. Understanding their likelihood to engage in reciprocal predation is a key poin...

Coccinella septempunctata is a nontarget beneficial arthropod and an important aphid predator in agricultural crops. In this study, the toxic effects of neonicotinoid acetamiprid on C. were investigated to determine its applicability efficacy against predator. The results toxicity test showed that second instar larvae most sensitive acetamiprid. LC50 values 1st, 2nd, 3rd, 4th 15.767, 9.412, 18....

Bu çalışma 2017-2018 yıllarında Adana ili soğan ekim alanlarında zararlı türler ile bunların parazitoit ve predatörlerinin saptaması amacıyla yapılmıştır. Çalışma sonucunda 4 takıma bağlı 9 familyadan 18 tür belirlenmiş olup; bu içerisinde soğanda en çok zarar yapan türlerin; Eobania vermiculata Müller, Thrips tabaci Lindeman Frankliniella occidentalis Pergande olduğu belirlenmiştir. Saptanan y...