Efficacy of Imidacloprid for Control of Cereal Leaf Beetle (Coleoptera: Chrysomelidae) in Barley

Abstract

The toxicity of imidacloprid to the cereal leaf beetle, Oulema melanopus (L.), was measured under laboratory and field conditions. Insect mortality and plant damage were determined from artificial and natural infestations of O. melanopus applied to various growth stages of barley. All rates of imidacloprid formulated and applied as a seed treatment caused >90% mortality to cereal leaf beetle larvae when barley was infested with eggs at the 4-leaf stage, but were ineffective when barley was infested with eggs at the early tillering or flag-leaf stages of barley. This window of susceptibility influenced results obtained in field trials where peak larval emergence did not occur until the early tillering stage of barley. The resulting mortality in plants from treated seeds never exceeded 40% in the field. Foliar imidacloprid, however, caused >90% mortality in the field, and may be another option in the management of the cereal leaf beetle.

Observaciones sobre acolchado plástico, imidacloprid y herramientas de identificación de Melanagromyza tomaterae Steyskal (Diptera: Agromyzidae) sobre Physalis ixocarpa Brot. (Solanaceae)

“…Este comportamiento de elegir las plantas más vigorosas podría ser la causa de la mayor cantidad de estados inmaduros del barrenador encontrada en plantas de tomate de cáscara que se desarrollaron en acolchado plástico transparente. El imidacloprid puede ser aplicado al follaje, al suelo o como tratamiento a la semilla (Tharp et al 2000), algunos autores mencionan su efectividad contra muchas plagas chupadoras y raspadoras-chupadoras tales como áfidos, moscas blancas y trips (Powell & Stoffella 1998;Marquini et al 2002;Costa et al 2011). Sin embargo, insectos con otros hábitos de alimentación como el masticador de las larvas que barrenan tallos, también son afectadas por este neonicotinoide, tal es el caso de Scirpophaga incertulas (Lepidoptera: Pyralidae) sobre el cultivo de arroz (Pandey & Choubey 2012).…”

Effects of seed treatments and storage duration on Myzus persicae (Hemiptera: Aphididae) and amaranth fresh leaf yield

“…It might be related to effectiveness of different active ingredients found Monceren insecticides to insect pests. The active ingredient imidacloprid found in Monceren seed treatments, possess systemic mode of action that interact with nicotinic acetylcholine receptors (nAChRs) of the nervous systems of insects such as aphids, causing paralysis and at times death (Tharp et al 2000). The effectiveness of imidacloprid seed treatments for protection of crops from aphids has been reported in several crops, such as wheat aphids on wheat.…”

The emerging problem in cereal crops in North-Eastern Tunisia: The cereal leaf beetles Oulema spp. (Coleoptera; Chrysomelidae; Criocerinae) dynamic populations and infestation rate

“…Based on the studies of Thrap et al [11] , beetles are sensitive to chemical treatments that can interrupt or break their cycle. According to Dimitrijeric et al [12] , the combination of nitrogen and potassium in foliar fertilisation accelerates the plant development and its maturity before that larvae reach its maximum of activity.…”