Novaluron (Rimon),a Novel IGR:Potency and Cross-Resistance

摘要

The potency of novaluron on laboratory susceptible and field strains of S.littoralis resembles that of chlorfluazuran and both compounds are about 20-fold more potent than teflubenzuron,No appreciable resistance to novaluron or chlorfluazuron was observed in a field strain of Sopodoptera littoralis collected from cucumber field in the central part of Israel.On the other hand,the field strain showed a mild resistance of about 4-fold to teflubenzuron as compared to the laboratory susceptible strain.A very resistant colony of Bemisia tabaci to pyriproxyfen (1,200-to,2,000-fold) showed no appreciable cross-resistance to novaluron.Two field colonies of B.tabaci pressurized with acetamiprid or thiamethoxam for 22 generations,resulting in a 30-to 50-fold resistance to acetamiprid and thiamethoxam,has no cross-resistance to novaluron.The above results are of special interest,indicating a possible alternation between novaluron,pyriproxyfen,and neonicotinoids in insecticide-resistance management programs aiming at preventing resistance development to these novel groups of insecticides against important pests such as whitefly and lepidopteran species.