Abstract: Hexahydrotriazine compounds of the formula: 1

Abstract: A hexahydrotrazine compound which is 1-(2-chloro-5-pyridylmethyl)-3,5-dimethyl-2-nitroiminohexahydro-1,3,5-triazine or 1-(2-chloro-5-thiazolylmethyl)-3,5-dimethyl-2-nitroiminiohexahydro-1,3,5-triazine and insecticides containing the same.

Abstract: Insecticides which are improved over the conventional insectides are provided by the use of a nitroguanidine compound represented by the following general formula (I): ##STR1## wherein R stands for hyydrogen or methyl; R.sup.1 and R.sup.2 are the same or different, and stand for hydrogen or methyl; and X stands for a group indicated by ##STR2## The insecticides provided by this invention are extremely active for controlling various harmful insects and yet are low in toxicity to warm-blooded animals, fishes and Crustacea, the remaining quantity thereof after their use is small, and they do not produce phytotoxicity in various plants.

Abstract: A herbicide exhibiting high herbicidal activity against a variety of weeds and being highly safe for useful crops can be obtained through the use of a heterocyclic compound represented by the following general formula (I): ##STR1## wherein R represents a group represented by the following formula: ##STR2## X represents an oxygen atom or a sulfur atom; R.sup.1 represents a halogen atom or a lower alkyl group; R.sup.2 represents a hydrogen atom or a methyl group; R.sup.3 represents a halogen atom, a lower alkyl group, a lower haloalkyl group, a lower alkoxy group, a lower alkylthio group, a cyano group or --COOR.sup.4 (R.sup.4 is a lower alkyl group, a lower alkoxyalkyl group or a tetrahydrofurfuryl group); m is 0, 1 or 2 and n is 0, 1, 2 or 3.