SENSITIVITY OF <i>BOOPHILUS MICROPLUS</i> (ACARI: IXODIDAE) TO PYRETHROIDS AND ORGANOPHOSPHATE IN FARMS IN THE VALE DO PARAÍBA REGION, SÃO PAULO, BRAZIL

Mendes, M.C.; Pereira, J.R.; Prado, A.P.

doi:10.1590/1808-1657v74p0812007

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Scientific Article • Arq. Inst. Biol. 74 (2) • Apr-Jun 2007 • https://doi.org/10.1590/1808-1657v74p0812007 copy

SENSITIVITY OF BOOPHILUS MICROPLUS (ACARI: IXODIDAE) TO PYRETHROIDS AND ORGANOPHOSPHATE IN FARMS IN THE VALE DO PARAÍBA REGION, SÃO PAULO, BRAZIL

SENSIBILIDADE DO BOOPHILUS MICROPLUS (ACARI: IXODIDAE) AOS PIRETRÓIDES E ORGANOFOSFORADOS EM FAZENDAS LOCALIZADAS NA REGIÃO DO VALE DO PARAÍBA, SÃO PAULO, BRASIL

Authorship SCIMAGO INSTITUTIONS RANKINGS

ABSTRACT

A study to evaluate the resistance of B. microplus to the active principles cypermethrin, deltamethrin and chlorpyriphos was performed together with the survey of the tick control practices used in 12 farms located in Vale do Paraíba Region, São Paulo, Brazil. Results obtained by the larval packet test (LPT) technique, adopted by FAO, showed established resistance to pyrethroids (cypermethrin 16.7% sensitive, 8.3% resistant level I and 75% resistant level II; deltamethrin 25% /sensitive, 33.3% resistant level II and 41.7% resistant level III) and emerging resistance to organophosphate compounds (chlorpiriphos 58.3% sensitive, 33.3% resistant level I and 8.4% resistant level II). The inquiry applied to the farmers showed that the combination of organophosphates and pyrethroids compounds products is the most commonly tick-killing compounds used in the region, followed by amitraz and macrocyclic lactones.

KEY WORDS
Boophilus microplus ; resistance; pyrethroids; organophosphate

Classification
Classification	RF	RF
Sensitive	≤ 2.4	< 1.4
Resistant level I	2.5 – 5.4	1.5 – 4.4
Resistant level II	5.5 – 50	4.5 -50
Resistant level III	>50	> 50

Strain (Farms)	LC_{50 (%)}	Confidence limit 95%	LC_{99 (%)}	Confidence limit 95%	RF
Mozo^* * Reference sensitive strain	0.0123	0.0059 – 0.0193	1.41	0.6997 – 4.5206
1	0.317	0.1157 – 3.6938	1.944	0.5909 – 25489.4	25.7
2	0.475	0.4104 – 0.5662	2.432	1.6921 – 4.2215	38.6
3	0.425	0.2803 – 0.8336	2.348	1.0759 – 23.6177	34.5
4	0.225	0.1199 – 0.5304	1.552	0.6177 – 32.8560	18.2
5	0.452	0.1651 – 120.5383	8.855	1.1657 – 3.2510	36.7
6	0.348	0.2427 – 0.5249	1.423	0.8225 – 5.2731	28.3
7	0.268	0.0791 – 28.7434	3.425	0.6446 – 1.8225	21.8
8	0.0058	0.0003 – 0.0145	0.088	0.0434 – 0.4860	0.5
9	0.0339	0.0187 – 0.0527	3.589	1.4549 – 16.7159	2.7
10	< 0.0123	-	<1.4	-	<1
11	0.466	0.1375 – 2646.42	30.451	2.1360 – 1.4522	37.8
12	0.15	7.026517E-02 – 0.5295205	3.11	0.7569834 – 212.1577	12.2

Strain (Farms)	LC_{50 (%)}	Confidence limit 95%	LC_{99 (%)}	Confidence limit 95%	RF
Mozo^* * Reference sensitive strain.	0.00232	0.0007 – 0.0046	0.78	0.4143 – 2.2923
1	0.0256	0.0242 – 0.0526	0.511	0.3436 – 0.8762	11.0
2	0.174	0.0610 – 0.6256	1.341	0.4466 – 368.5854	75
3	0.156	0.0708 – 0.3829	1.541	0.4006 – 1.0891	67.2
4	0.086	0.0507 – 0.1318	0.721	0.3785 – 2.7836	37.0
5	0.271	0.1648 – 0.5460	2.945	1.1277 – 32.7913	116.8
6	1.183	0.1595 – 0.2098	0.653	0.5128 – 0.9289	509.9
7	0.0698	0.00059 – 1.3371	0.344	0.0977 – 4.9163	30.1
8	0.00089	0.000043 – 0.002816	0.108	0.0527 – 0.5502	0.4
9	0.0028	0.0008 – 0.0059	0.707	0.3558 – 2.1847	1.2
10	<0.002	-	<0,78	-	<1
11	0.225	0.1197 – 0.3903	2,160	0,9669 – 15,8392	97.0
12	0.0137	0.0049 – 0.0259	0,3202	0,1240 – 3,2817	6.0

Strain (Farms)	LC_{50 (%)}	Confidence limit 95%	LC_{99 (%)}	Confidence limit 95%	RF
Mozo^* * Reference sensitive strain.	0.0141	0.0015 – 0.0222	0.0311	0.0197 – 0.0724
1	0.041	0.0327 – 0.0199	0.724	0.4574 – 1.4114	2.9
2	0.0074	0.0051 – 0.0098	0.534	0.3350 – 1.0399	0.5
3	0.084	0.0744 – 0.0969	3.47	2.2098 – 6.1834	5.9
4	0.041	0.0325 – 0.0506	13.02	5.1277 – 51.9154	2.9
5	0.039	0.0236 – 0.0594	1.40	0.5403 – 10.7399	2.7
6	0.0096	0.0036 – 0.0166	2.82	0.9894 – 21.8052	0.7
7	0.0126	0.0085 – 0.0166	0.152	0.1000 – 0.3090	0.8
8	0.0125	0.0091 – 0.0155	0.102	0.0740 – 0.1723	0.9
9	0.0077	0.00000073 – 0.0151	0.0244	0.0100 – 0.3027	0.5
10	0.016	0.0122– 0.0195	0.076	0.0559 – 0.1299	1.1
11	0.042	0.0351– 0.0513	1.45	0.7938 – 3.4444	3.0
12	0.0031	0.00018 – 0.0083	0.435	0.1728 – 6.2412	0.2

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[1] RF: Resistance Factor

[TFN01] ^*
Reference sensitive strain