Improved pesticidal compositions and pest control methods

A method for controlling winged insect pests, comprising exposing the pests to an effective amount of a combination of a β-diketone compound of formula (I):

• wherein
• X and Y are each independently selected from oxygen, sulfur —N—R4 or one of C═X and C═Y is CH2;
• A is (C═O)R1, (C═S)R1, OR2, SR2, (CR3NR4R5), C(R3)2OR2, NR4R5, (C═N—R4)R1, N═O, N(═O)2, NR4OR2 or SO4R2;
• B is H, C1-C10 alkyl, C2-C10 alkenyl, aryl or heteroaryl;
• C, D, E and F are each independently selected from H, C1-C10 alkyl, C2-C10 arylalkyl, C3-C6 cycloalkyl, C2-C10 alkenyl, C2-C10 heteroarylalkyl, C2-C10 haloalkyl, C2-C10 dihaloalkyl, C2-C10 trihaloalkyl, C2-C10 haloalkoxy, OR2, SR2, (CR3NR4R5), NR4R5, (C═N—R4)R1, N═O, N(—O)2, NR4OR2 and SO4R2;
• R1 is selected from H, C1-C10 alkyl, C2-C10 arylalkyl, C3-C6 cycloalkyl, C2-C10 alkenyl, C2-C10 heteroarylalkyl, C1-C10 haloalkyl, C1-C10 dihaloalkyl, C2-C10 trihaloalkyl, C2-C10 haloalkoxy, C1-C10 hydroxyalkyl, C1-C10 thioalkyl, C1-C10 nitroalkyl, OR2, SR2, (CR3NR4R5), NR4R5, (C═N—R4)R6, N═O, N(═O)2, NR4OR7 and SO4R7;
• R2 is selected from H, C1-C10 alkyl, C2-C10 arylalkyl, C3-C6 cycloalkyl, C2-C10 alkenyl, C2-C10 heteroarylalkyl, C2-C10 haloalkyl, C2-C10 dihaloalkyl, C2-C10 trihaloalkyl, (CR3NR4R5), NR4R5, (C═N—R4)R6, N—O, N(═O) 2 and NR4OR7;
• R3 is selected from H, C1-C10 alkyl, C2-C10 arylalkyl, C3-C6 cycloalkyl, C2-C10 alkenyl, C2-C10 heteroarylalkyl, C2-C10 haloalkyl, C2-C10 dihaloalkyl, C2-C10 trihaloalkyl, C2-C10 haloalkoxy, OR7, SR7, (CR8NR4R5), NR4R5, (C═N—R4)R6, N═O, N(═O)2, NR4OR7 and SO4R7;
• R4 and R5 are independently selected from H, C1-C10 alkyl, C2-C10 arylalkyl, C3-C6 cycloalkyl, C2-C10 alkenyl, C2-C10 heteroarylalkyl, C2-C10 haloalkyl, C2-C10 dihaloalkyl, C2-C10 trihaloalkyl, OR7 and SR7;
• R6 is selected from H, C1-C10 alkyl, C2-C10 arylalkyl, C3-C6 cycloalkyl, C2-C10 alkenyl, C2-C10 heteroarylalkyl, C2-C10 haloalkyl, C2-C10 dihaloalkyl, C2-C10 trihaloalkyl, C2-C10 haloalkoxy, OR7, SR7, (CR8NR9R10), NR9N10 and NR9OR7;
• R7 is selected from H, C1-C10 alkyl, C2-C10 arylalkyl, C3-C6 cycloalkyl, C2-C10 alkenyl, C2-C10 heteroarylalkyl, C2-C10 haloalkyl, C2-C10 dihaloalkyl, C2-C10 trihaloalkyl;
• R8 is selected from H, C1-C10 alkyl, C2-C10 arylalkyl, C3-C6 cycloalkyl, C2-C10 alkenyl, C2-C10 heteroarylalkyl, C2-C10 haloalkyl, C2-C10 dihaloalkyl, C2-C10 trihaloalkyl, OR11, SR11 and NR9R10;
• R9 and R10 are independently selected from H, C1-C10 alkyl, C2-C10 arylalkyl, C3-C6 cycloalkyl, C2-C10 alkenyl, C2-C10 heteroarylalkyl, C2-C10 haloalkyl, C2-C10 dihaloalkyl, C2-C10 trihaloalkyl, OR12 and SR12;
• R11 and R12 are independently selected from H, C1-C10 alkyl, C2-C10 arylalkyl, C3-C6 cycloalkyl, C2-C10 alkenyl, C2-C10 heteroarylalkyl, C2-C10 haloalkyl, C2-C10 dihaloalkyl and C2-C10 trihaloalkyl;
• and at least one second pesticide selected from a pyrethroid or a pyrethrin, wherein both the β-diketone compound of formula (I) and the at least one second pesticide is used in a sub-effective amount.