Brown plant hopper

In a recent study, resistance to the neonicotinoid insecticide, imidacloprid, in the brown plant hopper, Nilaparvata lugens, was found to be due to a point mutation at a conserved position in two nAChR subunits. As a result, it reduced the receptor binding of imidacloprid (Liu et al., 2005). 

Early studies of the relation of aryl N-methylcarbamate structure with activity and enzyme inhibition were first reported in 1966 and showed rather simple dependence on substituent effects for limited sets of compounds (4, 5) The apparent simplicity was partly due to the fact that QSAR techniques were still in the first decade of development. The true complexity of carbamate inhibition is revealed in later studies by Fujita and co-workers on brown plant-hopper AChE (6, 7), and by Hansch and co-workers on housefly head AChE (8). The latter study shows that 12 significant factors are required to correlate the pI50 data for a set of 269 carbamates. 

Powell, K.S., Spence, J., Bharathi, M., Gatehouse, J.A. and Gatehouse, A.M.R. (1998). Immunohistochemical and developmental studies to elucidate the mechanism of action of the snowdrop lectin on the rice brown plant-hopper, Nilaparvata lugens (Stal). J. Insect Physiol. 44,529-539. 

In paddy rice, granular application of fipronil at 25-75 g ha provides control of virtually all major insect pests, including stem borers (Chilo spp., Tryporyza spp., Rupela spp., Ostrinia spp.), brown plant hopper (Nilapawata lugens), rice water weevil (Lissorhoptrus spp.), and thrips (Frankliniella spp., Stenchaetothrips spp., Thrips spp., etc.). 

Bernal, C.C., R.M. Aguda, and M.B. Cohen. 2002a. Effects of rice lines transformed with Bacillus thruingiensis toxin genes on the brown plant hopper and its predator Cyrtorhinus lividipennis. Entomol. Exp. Appl. 102 21-28. 

Leaves pale plant stunted. Cause Leaf-hoppers. Leaves may appear stippled. These green or brown, wedge-shaped, /io"- /2" long insects feed on plant sap and can spread diseases. Treat infested plants with insecticidal soap in the evening or with a commercial pyrethrin spray or dust if infestation is severe. Prevent problems by covering plants with row cover when they germinate. 

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