the present invention are effective for controlling insect and acarid pests said compounds are also effective for protecting growing or harvested crops from attack and infestation by such pests in practice generally about 10 ppm to 10 000 ppm preferably about 100 to 5 000 ppm of the formula i compound dispersed in a liquid carrier when applied to the plants or the soil or water in which they are growing is effective to protect the plants from insect and acarina attack and infestation soil application of the formula i compounds is particularly effective for the control of the post embryonic development stages of coleoptera and diptera applications such as spray applications of compositions of the invention are generally effective at rates which provide about 0 125 kg ha to about 250 kg ha preferably about 10 kg ha to 100 kg ha of course it is contemplated that higher or lower rates of application of the n arylamidrazone compounds may be used dependent upon the prevailing environmental circumstances such as population density degree of infestation stage of plant growth soil conditions weather conditions and the like advantageously the compounds of the invention may be used in conjunction with or in combination with other biological and chemical control agents including.