Methods of controlling insects
View Patent ↗The present invention relates to methods, preferably for controlling and/or preventing infestation of boll weevil in cotton, comprising applying to a crop of cotton plants, the locus thereof, or propagation material thereof, a compound of formula (I), wherein -B 1 -B 2 -B 3 - is —C═N—O—, —C═N—CH 2 —, —C═CH—O— or —N—CH 2 —CH 2 —; L is a direct bond or methylene; A 1 and A 2 are C—H, or one of A 1 and A 2 is C—H and the other is N; X 1 is group X R 1 is C 1 -C 4 alkyl, C 1 C 4 aloalkyl or C 3 -C 6 cycloalkyl; R 2 is chlorodifluoromethyl or trifluoromethyl; each R 3 is independently bromo, chloro, fluoro or trifluoromethyl; R 4 is hydrogen, halogen, methyl, halomethyl or cyano; R 5 is hydrogen; or R 4 and R 5 together form a bridging 1,3-butadiene group; p is 2 or 3.
1. A method for controlling and/or preventing infestation of insects, the method comprising applying to a crop of cotton plants, the locus thereof, or propagation material thereof, a compound of formula (Ia) or (Ib)
wherein X 1 , R 1 , R 4 and R 5 in the compound of formula (Ia) have the following definitions
Stereo-
Stereo-
chemistry
chemistry
X1
R1
R4
R5
at **
at *
A1
3,4,5-
2,2,2-
CH3
H
S
R/S
trichloro-
tri-
phenyl
fluoro-
ethyl
A5
3 5-
Ethyl
CH3
H
S
R/S
dichloro-
4-fluoro-
phenyl
A10
3-chloro-5-
2,2,2-
CH3
H
R/S
R
bromo
tri-
phenyl-
fluoro-
ethyl
A11
3-chloro-5-
ethyl
CH3
H
R/S
R/S
bromo-
phenyl
A12
3-chloro-5-
ethyl
CH3
H
R/S
R/S
trifluoro-
methyl-
phenyl
A14
3,5-
2,2-
CH3
H
S
R
dichloro-
di-
phenyl
fluoro-
ethyl
A15
3,5-
ethyl
CH3
H
R/S
S
trifluoro-
methyl-
4-chloro-
phenyl
A18
3-chloro-5-
ethyl
CH═CH—CH═CH
S
R
trifluoro-
methyl-
phenyl
A19
3 5-di-
ethyl
Cl
H
S
R
chloro-4-
fluorophenyl
A20
3 5-di-
ethyl
CH3
H
S
R
chloro-4-
fluorophenyl
and R/S indicates a racemic mixture,
or a compound of formula (Ib)
wherein X 1 and R 1 in the compound of formula (Ib) have the following definitions
Stereochemistry
Stereochemistry
X1
R1
at *
at **
A7
3,5-
ethyl
R/S
S
dichlorophenyl
A13
3,5-
2,2,2-
R/S
R/S
dichlorophenyl
trifluoroethyl
and R/S indicates a racemic mixture.
2. A method according to claim 1 , wherein the method is a method of controlling and/or preventing infestation of insects the family Curculionidae in cotton comprising applying to a crop of cotton plants, the locus thereof, or propagation material thereof.
3. A method according to claim 2 , wherein said insects are selected from the group consisting of a member of the genus Anthonomus and Anthonomus grandis.
4. A method according to claim 3 , wherein said insects are selected from the group consisting of Anthonomus corvulus, Anthonomus elutus, Anthonomus elongatus, Anthonomus eugenii, Anthonomus consors, Anthonomus haematopus, Anthonomus lecontei, Anthonomus molochinus, Anthonomus morticinus, Anthonomus musculus, Anthonomus nigrinus, Anthonomus phyllocola, Anthonomus pictus, Anthonomus pomorum, Anthonomus quadrigibbus, Anthonomus rectirostris, Anthonomus rubi, Anthonomus santacruzi, Anthonomus signatus, Anthonomus subfasciatus , and Anthonomus tenebrosus.
5. A method of protecting by controlling and/or preventing insect/pest infestation on a plot of at least five hectares comprising a crop of useful plants, susceptible to and/or under attack by insects/pests, including at one least insects/pests selected from a member of the family Curculionidae and Anthonomus grandis , said method comprising applying to said plant and/or said insects/pests a compound of formula (Ia) or formula (Ib) as defined in claim 1 in a pre-defined plot part that is between 0.5 to 20%, based on area, of the plot, provided said pre-defined plot part forms the outer border of the plot, wherein said insects/pests predominantly approach the plot from the periphery of the plot.