Efficacy of microbiological and chemical insecticides as alternatives for control of <i>Myochrous armatus</i> (Baly, 1865) (Coleoptera: Chrysomelidae)

Jean-Baptiste, M. C.; Lima de Brida, A.; Garcia, F. R. M.

doi:10.1590/1519-6984.279150

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Brazilian Journal of Biology

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Original Article • Braz. J. Biol. 84 • 2024 • https://doi.org/10.1590/1519-6984.279150 copy

Efficacy of microbiological and chemical insecticides as alternatives for control of Myochrous armatus (Baly, 1865) (Coleoptera: Chrysomelidae)

Eficácia de inseticidas microbiológicos e químicos como alternativas para controle de Myochrous armatus (Baly, 1865) (Coleoptera: Chrysomelidae)

Authorship SCIMAGO INSTITUTIONS RANKINGS

Abstract

Myochrous armatus (Baly, 1865) (Coleoptera: Chrysomelidae) causes considerable losses to soybean crops in Brazil and several other South American countries. Applying biological insecticides can be an effective alternative to suppressing this pest. The objective of this study was to assess the efficacy of microbiological insecticides formulated from the fungi Beauveria bassiana + Metarhizium anisopliae (Bometil) and B. bassiana alone (Ballvéria), and the bacterium Bacillus thuringiensis (Acera) alone and in combination with the chemical insecticides fipronil, ethiprole and chlorpyrifos, against M. armatus adults. The insecticides based on B. bassiana + M. anisopliae were found to be more pathogenic than those based on B. bassiana, causing cumulative mortality rates in the ten days of 85.0 and 65.0% respectively. In contrast, B. thuringiensis caused 92.5% mortality. These products alone and in combination were effective for control at their lowest concentrations. Therefore, the use of microbiological insecticides individually or in combination with chemical insecticides is a promising alternative for the integrated management of M. armatus.

Keywords:
microbiological insecticides; chemical insecticides; soybean mealworm; alternatives control

Active ingredient	^aDose a Dose g or mL of c.p. (commercial product)/1 liter of water; IBCB = Brazilian Biological Control Institute; WG = Water-dispersible Granules; CS = Concentrated Suspension; EC = Emulsifiable Concentrate; WP = Wettable Powder. (c.p.)	Trade name	Chemical group
Fipronil	0.262g/L	Fipronil® 80WG CCAB	Pyrazole
Ethiprole	2.5 g /L	Curbix® 8 200 CS	Phenylpyrazole
Chlorpyrifos	8.0 mL/L	Chlorpyrifos® 8 480 EC	Organophosphorus
Beauveria bassiana IBCB 66	2.0 g/L	Bometil® 8 300 WP	Microbiological insecticide
Metarhizium anisopliae IBCB 425	2.0 g/L	Bometil® 8 300 WP	Microbiological insecticide
Beauveria bassiana IBCB 66	2.0 g/ L	Ballvéria® 8 300 WP	Microbiological insecticide
Bacillus thuringiensis IBCB 1641+1644	5.0 mL/L	Acera® 8 64 EC	Microbiological insecticide

Treatment		Mortality (%)
Treatment	1 day	3 days	7 days	10 days
Fipronil	87.50 ± 3.65 a	100.00 ± 0.00 a	100.00 ± 0.00 a	100.00 ± 0.00 a
Ethiprole	80.00 ± 3.77 a	100.00 ± 0.00 a	100.00 ± 0.00 a	100.00 ± 0.00 a
Chlorpyrifos	47.50 ± 3.65 b	100.00 ± 0.00 a	100.00 ± 0.00 a	100.00 ± 0.00 a
B. bassiana IBC 66 + M. Anisopliae IBC 425*	0.00 ± 0.00 d	22.50 ± 4.53 e	55.00 ± 5.00 c	85.00 ± 5.00 a
B. bassiana IBC 66^* * Bonetil (Bauveria bassiana, Isolate IBCB 66 + Metarhizium Anisopliae, Isolate IBCB 425), Ballvéria (Bauveria bassiana, Isolate IBCB 66), Acera (Bacllus thuringiensis, Isolates IBCB 1641 + 1644).	0.00 ± 0.00 d	10.00 ± 3.77 of	35.00 ± 5.00 d	65.00 ± 7.31 b
B. bassiana IBC 66 + M. Anisopliae IBC 425 + fipronil	45.00 ± 8.23 b	70.00 ± 6.54 b	87.50 ± 3.65 ab	100.00 ± 0.00 a
B. bassiana IBC 66 + fipronil	25.00 ± 5.00 c	60.00 ± 6.26 bc	77.50 ± 4.53 b	87.50 ± 3.77 a
B. bassiana IBC 66 + M. Anisopliae IBC 425 + ethiprole	15.00 ± 3.65 cd	50.00 ± 3.77 cd	85.00 ± 5.00 ab	100.00 ± 0.00 a
B. bassiana IBC 66 + ethiprole	12.50 ± 3.65 cd	42.50 ± 2.50 d	77.50 ± 5.90 b	100.00 ± 0.00 a
B. bassiana IBC 66 + M. Anisopliae IBC 425+ chlorpyrifos	55.00 ± 5.00 b	100.00 ± 0.00 a	100.00 ± 0.00 a	100.00 ± 0.00 a
B. bassiana IBC 66 + chlorpyrifos	42.50 ± 2.50 b	100.00 ± 0.00 a	100.00 ± 0.00 a	100.00 ± 0.00 a
B. thuringiensis IBC 1641 + 1644*	2.50 ± 0.94 d	17.50 ± 4.53 e	52.50 ± 5.26 cd	92.50 ± 3.65 a
Control (water)	0.00 ± 0.00 d	0.00 ± 0.00 f	2.500 ± 2.50 e	7.50 ± 3.65 c
F	96.79	178.05	108.97	73.32
d.f	12.91	12.91	12.91	12.91
P	< 0.001	< 0.001	< 0.001	< 0.001

Instituto Internacional de Ecologia R. Bento Carlos, 750, 13560-660 São Carlos SP - Brasil, Tel. e Fax: (55 16) 3362-5400 - São Carlos - SP - Brazil
E-mail: bjb@bjb.com.br

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[1] *e-mail: flavio.garcia@ufpel.edu.br