Chlorfenapyr has no repellent effect on termites at a concentration lower than 300 mg/kg. The toxicity of chlorfenapyr to termites is determined by the concentration. The external environmental factors (such as pH value, organic carbon content, and soil stickiness) also affect the toxicity of chlorfenapyr to termites. In addition, termites’ tolerance to chlorfenapyr is affected by species and grades. Chlorfenapyr has a relatively long degradation half-life at high concentration. However, studies concerning the effective duration of chlorfenapyr under a simulated construction condition are rarely seen. The effectiveness of chlorfenapyr can be synergized by a combined formula or other methods. Horizontal transfer of chlorfenapyr can be found in some termite populations. The characteristics such as low repellent effectiveness, combination synergism, and horizontal transfer in termites can be used in making the bait system for control of termites.
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