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result sql = Organophosphorus insecticides synergize pyrethroids in the resistant strain of cotton bollworm, Helicoverpa armigera (Hübner) (Lepidoptera: Noctuidae) from West Africa.
Organophosphorus insecticides synergize pyrethroids in the resistant strain of cotton bollworm, Helicoverpa armigera (Hübner) (Lepidoptera: Noctuidae) from West Africa.
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char = ;code = 32
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char = ;code = 32
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char = d;code = 100
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char = i;code = 105
char = o;code = 111
char = n;code = 110
char = a;code = 97
char = l;code = 108
char = ;code = 32
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char = o;code = 111
char = l;code = 108
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char = n;code = 110
char = ;code = 32
char = t;code = 116
char = h;code = 104
char = e;code = 101
char = ;code = 32
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char = e;code = 101
char = r;code = 114
char = a;code = 97
char = l;code = 108
char = l;code = 108
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char = r;code = 114
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char = s;code = 115
char = i;code = 105
char = s;code = 115
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char = n;code = 110
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char = e;code = 101
char = ;code = 32
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char = e;code = 101
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char = n;code = 110
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char = r;code = 114
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char = t;code = 116
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char = g;code = 103
char = y;code = 121
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char = b;code = 98
char = e;code = 101
char = c;code = 99
char = a;code = 97
char = u;code = 117
char = s;code = 115
char = e;code = 101
char = ;code = 32
char = t;code = 116
char = h;code = 104
char = e;code = 101
char = ;code = 32
char = p;code = 112
char = y;code = 121
char = r;code = 114
char = e;code = 101
char = t;code = 116
char = h;code = 104
char = r;code = 114
char = o;code = 111
char = i;code = 105
char = d;code = 100
char = ;code = 32
char = r;code = 114
char = e;code = 101
char = s;code = 115
char = i;code = 105
char = s;code = 115
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char = a;code = 97
char = n;code = 110
char = c;code = 99
char = e;code = 101
char = ;code = 32
char = i;code = 105
char = n;code = 110
char = ;code = 32
char = H;code = 72
char = .;code = 46
char = ;code = 32
char = a;code = 97
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char = m;code = 109
char = i;code = 105
char = g;code = 103
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char = ;code = 32
char = f;code = 102
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char = m;code = 109
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char = t;code = 116
char = ;code = 32
char = A;code = 65
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char = r;code = 114
char = i;code = 105
char = c;code = 99
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char = ;code = 32
char = i;code = 105
char = s;code = 115
char = ;code = 32
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char = t;code = 116
char = ;code = 32
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char = t;code = 116
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char = s;code = 115
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char = b;code = 98
char = l;code = 108
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char = ;code = 32
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char = e;code = 101
char = c;code = 99
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char = e;code = 101
char = a;code = 97
char = s;code = 115
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char = n;code = 110
char = g;code = 103
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char = ;code = 32
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char = r;code = 114
char = e;code = 101
char = a;code = 97
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char = n;code = 110
char = g;code = 103
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char = w;code = 119
char = i;code = 105
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char = r;code = 114
char = e;code = 101
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char = m;code = 109
char = e;code = 101
char = n;code = 110
char = t;code = 116
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char = ;code = 32
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char = ;code = 32
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char = c;code = 99
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char = ;code = 32
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char = o;code = 111
char = n;code = 110
char = ,;code = 44
char = ;code = 32
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char = h;code = 104
char = e;code = 101
char = ;code = 32
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char = u;code = 117
char = s;code = 115
char = c;code = 99
char = e;code = 101
char = p;code = 112
char = t;code = 116
char = i;code = 105
char = b;code = 98
char = i;code = 105
char = l;code = 108
char = i;code = 105
char = t;code = 116
char = y;code = 121
char = ;code = 32
char = o;code = 111
char = f;code = 102
char = ;code = 32
char = H;code = 72
char = .;code = 46
char = ;code = 32
char = a;code = 97
char = r;code = 114
char = m;code = 109
char = i;code = 105
char = g;code = 103
char = e;code = 101
char = r;code = 114
char = a;code = 97
char = ;code = 32
char = t;code = 116
char = o;code = 111
char = ;code = 32
char = i;code = 105
char = n;code = 110
char = s;code = 115
char = e;code = 101
char = c;code = 99
char = t;code = 116
char = i;code = 105
char = c;code = 99
char = i;code = 105
char = d;code = 100
char = e;code = 101
char = s;code = 115
char = ;code = 32
char = s;code = 115
char = h;code = 104
char = o;code = 111
char = u;code = 117
char = l;code = 108
char = d;code = 100
char = ;code = 32
char = b;code = 98
char = e;code = 101
char = ;code = 32
char = r;code = 114
char = e;code = 101
char = s;code = 115
char = t;code = 116
char = o;code = 111
char = r;code = 114
char = e;code = 101
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char = <;code = 60
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char = /;code = 47
char = >;code = 62
result sql = Helicoverpa armigera (Hübner) populations from West Africa recently developed resistance to pyrethroid insecticides through enhanced metabolism by mixed-function oxidases. The combination index method was used to study the synergism of pyrethroids by organophosphorus insecticides. Several mixtures of insecticides currently registered to control cotton pest complex in West Africa were tested, including: cypermethrin/ethion, cypermethrin/profenofos, deltamethrin/ triazophos, deltamethrin/chlorpyriphos, cyfluthrin/chlorpyriphos, and betacyfluthrin/chlorpyriphos. In the resistant strain, the organophosphorus insecticides significantly increased the toxicity of pyrethroids suppressing the resistance effect, either by additive or synergistic effects. SIGNIFICANT SYNERGISM WAS SHOWN FOR THE FOLLOWING MIXTURES: cypermethrin/ethion, deltamethrin/triazophos, and deltamethrin/chlorpyriphos. The use of synergism from these insecticide mixtures should prove to be an additional tool in the overall resistance management strategy because the pyrethroid resistance in H. armigera from West Africa is not yet stable, decreasing between cotton seasons and increasing with treatments. In absence of selection, the susceptibility of H. armigera to insecticides should be restored.

Publication: J. Econ. Entomol. 2003 Apr ;96(2)::468-74.
Publication Date: 2003 Apr
Study Author(s): Martin, Thibaud;Ochou, Ochou G;Vaissayre, Maurice;Fournier, Didier;
Institution: Programme Coton, Centre National de Recherche Agronomique, BP 633 Bouaké Cote D'Ivoire, West Africa.
Shortcut link to this study:
Helicoverpa armigera (Hübner) populations from West Africa recently developed resistance to pyrethroid insecticides through enhanced metabolism by mixed-function oxidases. The combination index method was used to study the synergism of pyrethroids by organophosphorus insecticides. Several mixtures of insecticides currently registered to control cotton pest complex in West Africa were tested, including: cypermethrin/ethion, cypermethrin/profenofos, deltamethrin/ triazophos, deltamethrin/chlorpyriphos, cyfluthrin/chlorpyriphos, and betacyfluthrin/chlorpyriphos. In the resistant strain, the organophosphorus insecticides significantly increased the toxicity of pyrethroids suppressing the resistance effect, either by additive or synergistic effects. SIGNIFICANT SYNERGISM WAS SHOWN FOR THE FOLLOWING MIXTURES: cypermethrin/ethion, deltamethrin/triazophos, and deltamethrin/chlorpyriphos. The use of synergism from these insecticide mixtures should prove to be an additional tool in the overall resistance management strategy because the pyrethroid resistance in H. armigera from West Africa is not yet stable, decreasing between cotton seasons and increasing with treatments. In absence of selection, the susceptibility of H. armigera to insecticides should be restored.
PMID: 14994817

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