Abstract: N-phosphinyl- or phosphinothioyl-amidines of the formula ##STR1## wherein R.sub.1 represents C.sub.1 -C.sub.4 -alkyl, C.sub.1 -C.sub.4 -alkylthio or C.sub.1 -C.sub.4 -alkoxy,R.sub.2 represents C.sub.1 -C.sub.7 -alkyl, propenyl or propinyl,R.sub.3 represents hydrogen, methyl or ethyl,R.sub.4 represents C.sub.1 -C.sub.6 -alkyl, C.sub.2 -C.sub.6 -alkenyl, (cycloalkyl)methyl, furfuryl or tetrahydrofurfuryl,R.sub.5 represents C.sub.1 -C.sub.6 -alkyl or C.sub.2 -C.sub.6 -alkenyl,X and Y each represent oxygen or sulphur, orR.sub.4 and R.sub.5 form, with the nitrogen atom to which they are bound, the morpholino, piperidino, methylpiperidino, pyrrolidino or hexamethyleneimino ring, orR.sub.3 with R.sub.4 or R.sub.5 forms a 5 or 6-membered ring, whereby the group R.sub.4 or R.sub.5 not participating in the ring formation then denote methyl or ethyl,Processes for their manufacture and their use for pest control.

Abstract: N-phosphinyl- or phosphinothioyl-amidines of the formula ##EQU1## wherein R.sub.1 represents methoxy or ethoxyR.sub.2 represents methyl, ethyl, propyl, n-pentyl, n-hexyl, allyl or propargyl each ofR.sub.4 and R.sub.5 represents allyl orR.sub.4 and R.sub.5 form, with the nitrogen atom to which they are bound, the piperidino, ring, processes for their manufacture and their use for pest control.

Abstract: Compounds of the formula ##EQU1## wherein R.sub.1 represents phenyl, or phenyl mono- to trisubstituted by halogen, mono- or disubstituted by C.sub.1 -C.sub.4 -alkyl, C.sub.1 -C.sub.4 -alkylthio, nitro, cyano or trifluoromethyl, or monosubstituted by C.sub.1 -C.sub.4 -carbalkoxy,R.sub.2 represents methyl, methoxy, ethyl, ethoxy or phenyl,R.sub.3 represents hydrogen or methyl,R.sub.4 and R.sub.5 represent methyl, ethyl, n-propyl, isopropyl or allyl,X and Y represent oxygen or sulphur, orR.sub.4 and R.sub.5 with the nitrogen atom to which they are bound form the morpholino, piperidino or pyrrolidino ring, orR.sub.3 with R.sub.4 or R.sub.5 forms a 5- or 6-membered saturated ring, whereby then the group R.sub.4 or R.sub.5 not participating in the ring formation represents methyl or ethyl,A process for their manufacture and their use for the control of pests, especially for the control of phytopathogenic nematodes, are disclosed.