effect of the redonticide symag (sodium cyanid) on nesokia indica

according to the extent of damage to the crops and irrigation canals the nesokia indica is ‎one of the most important rodent pests in iran. cymag is a registered product in the country to ‎control citellus fulvus and large amount of it is available at present. with the aim of studying ‎the effect of it on the n. indica experiments were conducted under field conditions in tehran ‎and kerman provinces. the experiments were performed in a completely randomized block ‎design in four replicates with two experimental and one control block with the extend of about ‎‎500 square meters each. the treatment blocks included 2-8 g cymag/complex burrow (based on ‎the average volume of the burrows), and 1-2 phostoxin tablets/complex burrow, and the third ‎block was the control without any rodenticide. percentage success was estimated using ‎henderson and tilton (1955) formula. the results show the success of about 98 and 96.4 percent ‎using cymag and 88.5 and 89.5 percent using phostoxin tablets in tehran and kerman ‎provinces respectively. higher efficacy observed in tehran province could be due to higher ‎moisture present in the soil of this province. since cymag is highly toxic, it must be used by ‎trained personnel and farmers using suitable safety measures.‎