Effect of three insect growth regulators on certain biological aspects of the lesser grain borer, <i>Rhyzopertha dominica</i> (Coleoptera: Bostrichidae)

Mahmoud, M. A.; AbdElrahman, I. E.; Zedan, O. A. A.; Abdel-Rahman, Y. A.; Saba, R. M.; Laban, G. F. Abo; Ibrahim, I. S.

doi:10.1590/1519-6984.267629

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Brazilian Journal of Biology

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Original Article • Braz. J. Biol. 82 • 2022 • https://doi.org/10.1590/1519-6984.267629 copy

Effect of three insect growth regulators on certain biological aspects of the lesser grain borer, Rhyzopertha dominica (Coleoptera: Bostrichidae)

Efeito de três reguladores de crescimento de insetos em certos aspectos biológicos da broca-do-grão, Rhyzopertha dominica (Coleoptera: Bostrichidae)

Authorship SCIMAGO INSTITUTIONS RANKINGS

Abstract

The current study was performed to evaluate the efficacy of certain insect growth regulators (IGRs), buprofezin, hexaflumuron, and lufenuron, at different concentrations (0.2, 0.4, and 0.8 ppm) against Rhyzopertha dominica in wheat grains. Our data showed that the three IGRs tested at different concentrations significantly affected the mortality of adults to varying extents. The percentage mortality of adults increased with increasing concentrations and time of exposure. After 21 days of treatment, the highest mortality (80.00%, 78.33%, and 60.00%) was observed at the highest concentration (0.8 ppm) and the lowest mortality (58.33%, 46.66%, and 30.00%) was observed at the lowest concentration (0.2 ppm) of lufenuron, buprofezin, and hexaflumuron, respectively. The tested IGRs reduced fecundity, hatchability, adult emergence, and weight loss in treated wheat grains and increased the developmental period of R. dominica compared with the control.

Keywords:
lesser grain borer; IGR; mortality; fecundity; adult emergence; weight loss

IGR	Concentration (ppm)	Mean ± SE mortality (%)
IGR	Concentration (ppm)	7 days	14 days	21 days
Buprofezin	0.2	26.66 ± 1.66^e	40.00 ± 2.89^e	46.66 ± 3.33^d
	0.4	31.66 ± 3.33d^e	48.33 ± 1.66^cde	70.00 ± 5.78^ab
	0.8	40.00 ± 0.00b^c	61.66 ± 3.33^ab	78.33 ± 1.66^a
Hexaflumuron	0.2	16.66 ± 1.66^f	21.66 ± 4.41^f	30.00 ± 2.89^e
	0.4	28.33 ± 1.66d^e	36.66 ± 6.67^e	51.66 ± 3.33^cd
	0.8	41.66 ± 4.41^bc	46.66 ± 3.33^de	60.00 ± 2.89^bc
Lufenuron	0.2	35.00 ± 2.89^cd	53.33 ± 4.41^bcd	58.33 ± 3.33^c
	0.4	43.33 ± 1.66^b	60.00 ± 2.89^bc	71.66 ± 2.89^a
	0.8	53.33 ± 3.33^a	73.33 ± 4.4^a	80.00 ± 5.00^a
F-value		17.2	14.6	19.5

IGR	Concentration (ppm)	Mean ± SE
IGR	Concentration (ppm)	No. of eggs/female	% reduction
Control	0.0	163.33 ± 3.18^a	-
Buprofezin	0.2	72.00 ± 3.46^c	55.96 ± 1.26
	0.4	57.66 ± 4.63^de	64.77 ± 2.14
	0.8	16.33 ± 4.26^f	90.08 ± 2.45
Hexaflumuron	0.2	100.33 ± 1.45^b	38.53 ± 1.19
	0.4	82.00 ± 3.60^c	49.69 ± 3.01
	0.8	58.66 ± 1.85^d	64.04 ± 1.42
Lufenuron	0.2	83.00 ± 3.00^c	49.13 ± 2.10
	0.4	47.33 ± 2.02^e	70.94 ± 1.80
	0.8	21.66 ± 6.96^f	86.88 ± 3.02

IGR	Concentration (ppm)	Mean ± SE
IGR	Concentration (ppm)	No. of eggs hatched	% reduction
Control	0.0	160.66 ± 3.28^a	-
Buprofezin	0.2	60.00 ± 1.52^d	62.66 ± 0.19
	0.4	45.00 ± 2.31^e	71.92 ± 1.85
	0.8	3.66 ± 3.67^g	97.69 ± 2.30
Hexaflumuron	0.2	87.33 ± 3.93^b	45.59 ± 2.71
	0.4	65.00 ± 2.00^d	59.52 ± 1.33
	0.8	40.33 ± 2.02^ef	74.85 ± 1.54
Lufenuron	0.2	75.00 ± 2.08^c	53.30 ± 1.18
	0.4	34.66 ± 2.90^f	78.33 ± 2.22
	0.8	0.00 ± 0.00^g	100 ± 0.00

IGR	Concentration (ppm)	Mean ± SE
IGR	Concentration (ppm)	No. of adults emerged	% reduction
Control	0.0	150.66 ± 1.20^a	-
Buprofezin	0.2	47.00 ± 1.00^c	68.65 ± 0.38
	0.4	22.00 ± 3.21^e	85.36 ± 2.21
	0.8	1.33 ± 1.33^g	99.11 ± 0.89
Hexaflumuron	0.2	63.33 ± 1.85^b	57.97 ± 0.92
	0.4	43.66 ± 2.60^cd	71.03 ± 1.51
	0.8	11.00 ± 1.15^f	92.49 ± 0.
Lufenuron	0.2	39.33 ± 2.60^d	73.86 ± 1.92
	0.4	16.00 ± 2.89^f	89.38 ± 1.91
	0.8	0.00 ± 0.00^g	100 ± 0.00

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[1] *e-mail: MahmoudAli.49@azhar.edu.eg