Abstract: A pyran derivative represented by a general formula ##STR1## wherein R.sub.1 is hydrogen, lower alkyl, cycloalkyl or phenyl, R.sub.2 is alkyl having 8 to 20 carbon atoms, R.sub.3 is hydrogen, halogen, ##STR2## or --CH.sub.2 N A, R.sub.4 and R.sub.5 being each lower alkyl or cycloalkyl, A being --CH.sub.2 13 , oxygen or nitrogen atom, N A forms five or six-member ring (the ring may have no substitutent or have at least one substituent selected from lower alkyl, lower alkoxy and halogen atom), or an acid salt thereof, are useful as agricultural miticides.

Abstract: A pyran derivative represented by a general formula ##STR1## wherein R.sub.1 is hydrogen, lower alkyl, cycloalkyl or phenyl, R.sub.2 is alkyl having 8 to 20 carbon atoms, R.sub.3 is hydrogen, halogen, ##STR2## R.sub.4 and R.sub.5 being each lower alkyl or cycloalkyl, A being --CH.sub.2 --, oxygen or nitrogen atom, ##STR3## forms five or six-member ring (the ring may have no substituent or have at least one substituent selected from lower alkyl, lower alkoxy and halogen atom), or an acid salt thereof, are useful as agricultural miticides.

Abstract: A novel S-methyl N-[{N-methyl-N-(N,N-disubstituted aminosulfenyl)carbamoyl}oxy]thioacetamidate derivative represented by the formula (I): ##STR1## which has insecticidal, miticidal or nematocidal activity comparable to or higher than known methomyl but which is quite low in toxicity to warm-blooded animals as compared to methomyl, is disclosed. An insecticidal, miticidal or nematocidal composition containing the same, and a process for preparing the same are also disclosed. A method for controlling noxious insects, mites or nematodes by using the same is further disclosed.

Abstract: This invention relates to carbamate derivatives represented by the formula (I): ##STR1## a process for preparing the derivatives and insecticides containing the derivatives.