The toxic values of 12 organic tin compounds towards newly hatched larvae of Hylotrupes bajulus were determined after 4- and 12-week test periods in comparison with bis-tri-n-butyltin oxide (TBTO). Tri-n-butyltin benzoate as well as the 2-, 3- and 4-methyl benzoate of tributyltin oxide were equally effective as TBTO and the latter two were somewhat more effective after a 12-week test period. Almost the same effects were obtained with N-cyclohexyl-diazenium-dioxy tri-n-butyltin. Less effective than TBTO by about the factor 2 were the compounds hexa-n-butylditin, tripropyltin(2-methyl benzoate) and N-cyclohexyl-diazenium-dioxy-tripropyltin, by about the factor 3 the compounds 3-acetyl-6-methyl-1.2-pyrane-4-on-2-tributyltin oxylate, the respective triphenyl compound and tri-n-butyltin dibrome propionate, by about the factor 10 another compound. Not only the chemical constitution but also the tin contents have to be considered in the evaluation of the results.

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