1. A method for protecting from a propagule or a plant grown therefrom from an invertebrate pest, comprising:
contacting the propagule or the locus of the propagule with a biologically effective amount of a compound of Formula I, an N-oxide thereof or an agriculturally suitable salt thereof wherein A and B are independently O or S;
R1 is H, C1-C6 alkyl, C2-C6 alkoxycarbonyl or C2-C6 alkylcarbonyl;
R2 is H or C1-C6 alkyl;
R3 is H; C1-C6 alkyl, C2-C6 alkenyl, C2-C6 alkynyl, or C3-C6 cycloalkyl, each optionally substituted with one or more substituents selected from the group consisting of halogen, CN, NO2, hydroxy, C1-C4 alkyl, C1-C4 alkoxy, C1-C4 haloalkoxy, C1-C4 alkylthio, C1-C4 alkylsulfinyl, C1-C4 alkylsulfonyl, C2-C6 alkoxycarbonyl, C2-C6 alkylcarbonyl, C3-C6 trialkylsilyl, phenyl, phenoxy, 5-membered heteroaromatic rings, and 6-membered heteroaromatic rings;
each phenyl, phenoxy, 5-membered heteroaromatic ring, and 6-membered heteroaromatic ring optionally substituted with one to three substituents independently selected from the group consisting of C1-C4 alkyl, C2-C4 alkenyl, C2-C4 alkynyl, C3-C6 cycloalkyl, C1-C4 haloalkyl, C2-C4 haloalkenyl, C2-C4 haloalkynyl, C3-C6 halocycloalkyl, halogen, CN, NO2, C1-C4 alkoxy, C1-C4 haloalkoxy, C1-C4 alkylthio, C1-C4 alkylsulfinyl, C1-C4 alkylsulfonyl, C1-C4 alkylamino, C2-C8 dialkylamino, C3-C6 cycloalkylamino, C4-C8 (alkyl)(cycloalkyl)amino, C2-C4 alkylcarbonyl, C2-C6 alkoxycarbonyl, C2-C6 alkylaminocarbonyl, C3-C8 dialkylaminocarbonyl and C3-C6 trialkylsilyl; C1-C4 alkoxy; C1-C4 alkylamino; C2-C8 dialkylamino; C3-C6 cycloalkylamino; C2-C6 alkoxycarbonyl or C2-C6 alkylcarbonyl;

R4 is H, C1-C6 alkyl, C2-C6 alkenyl, C2-C6 alkynyl, C3-C6 cycloalkyl, C1-C6 haloalkyl, CN, halogen, C1l-C4 alkoxy, C1-C4 haloalkoxy or NO2;
R5 is H, C1-C6 alkyl, C1-C6 haloalkyl, C1-C4 alkoxyalkyl, C1-C4 hydroxyalkyl, C(O)R10, CO2R10, C(O)NR10R11, halogen, C1-C4 alkoxy, C1-C4 haloalkoxy, NR10R11, N(R11)C(O)R10, N(R11)CO2R10 or S(O)n R12;
R6 is H, C1-C6 alkyl, C1-C6 haloalkyl, halogen, CN, C1-C4 alkoxy or C1-C4 haloalkoxy;
R7 is C1-C6 alkyl, C2-C6 alkenyl, C2-C6 alkynyl, C3-C6 cycloalkyl, C1-C6 haloalkyl, C2-C6 haloalkenyl, C2-C6 haloalkynyl or C3-C6 halocycloalkyl;
or R7 is a phenyl ring, a benzyl ring, a 5- or 6-membered heteroaromatic ring, a naphthyl ring system or an aromatic 8-, 9- or 10-membered fused heterobicyclic ring system, each ring or ring system optionally substituted with one to three substituents independently selected from R9;
R8 is H, C1-C6 alkyl, C1-C6 haloalkyl, halogen, C1-C4 alkoxy or C1-C4 haloalkoxy;
each R9 is independently C1-C4 alkyl, C2-C4 alkenyl, C2-C4 alkynyl, C3-C6 cycloalkyl, C1-C4 haloalkyl, C2-C4 haloalkenyl, C2-C4 haloalkynyl, C3-C6 halocycloalkyl, halogen, CN, NO2, C1-C4 alkoxy, C1-C4 haloalkoxy, C1-C4 alkylthio, C1-C4 alkylsulfinyl, C1-C4 alkylsulfonyl, C1-C4 alkylamino, C2-C8 dialkylamino, C3-C6 cycloalkylamino, C4-C8 (alkyl)(cycloalkyl)amino, C2-C4 alkylcarbonyl, C2-C6 alkoxycarbonyl, C2-C6 alkylaminocarbonyl, C3-C8 dialkylaminocarbonyl or C3-C6 trialkylsilyl;
R10 is H, C1-C4 alkyl or C1-C4 haloalkyl;
R11 is H or C1-C4 alkyl;
R12 is C1-C4 alkyl or C1-C4 haloalkyl; and n is 0, 1 or 2.