Efficacy of selected insecticides on the stink bug complex in Texas soybean, 2024

The stink bug complex in Texas soybean is comprised of redbanded, brown, and southern green stink bugs and is an important pest in soybean production. They feed on developing pods and can significantly reduce yield. This research aimed to evaluate the efficacy of selected foliar insecticides, including a new product (A21550CP), for controlling stink bugs in soybeans (variety ‘AG72XF0’) in Texas. The study was conducted at the Texas A&M AgriLife Research and Extension Center in Beaumont, Texas. Soybean was planted on 13 Jun 2024. Plots were 4 rows, 25 feet long, with 30-inch row spacing, and arranged as a randomized completed block design with 6 treatments and 4 replications. Soybeans were sampled frequently for stink bug presence throughout the growing season. Stink bug populations reached threshold levels on 7 Oct when soybeans were at the R6 stage. Applications were made with a CO₂-powered spray rig (30 gpa), using 2-liter plastic bottles. Treatments were as follows: 2 rates of Endigo ZCX, 2 rates of A21550CP (PLINAZOLIN technology SC400), Orthene 97, and untreated check. All A21550CP treatments included the adjuvant Dyne-Amic at 0.25% v:v. Treatments were applied on 9 Oct, and stink bug populations were evaluated 3 (12 Oct), 7 (16 Oct), and 10 (19 Oct) days after treatment (DAT). Insecticide efficacy on the stink bug complex was evaluated by taking 10 sweeps, using a 15-inch sweep net in 1 row of each plot. Contents of the sweep net were identified, and the total number of stink bugs (adults + nymphs) per species was recorded from each plot. Data were analyzed with ANOVA, and means were separated using a Fisher’s protected LSD (P < 0.05).

Redbanded stink bug. At 3 DAT, there were no significant differences between the untreated check and other insecticide treatments in redbanded stink bug (adults + nymphs) pressure (Table 1). However, at 7 and 10 DAT, all treated plots had significantly lower redbanded stink bug (adults + nymphs) pressure when compared with the untreated check.

Table 1.

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Treatment/Formulation	Rate/acre (fl oz)	Mean number of redbanded stink bugs (adults + nymphs) per 10 sweeps
Treatment/Formulation	Rate/acre (fl oz)	3 DAT^a	7 DAT	10 DAT
Endigo ZCX Low	4.0	5.8	1.8b	6.5b
Endigo ZCX High	4.5	6.0	1.5b	5.5b
A21550CP^b Low	1.6	8.0	1.3b	3.3b
A21550CP^b High	2.1	14.5	0.5b	4.3b
Orthene 97	1^c	5.0	1.3b	6.8b
Untreated check	–	17.0	4.8a	12.0a
P > F		0.0686	0.0076	0.0169

Treatment/Formulation	Rate/acre (fl oz)	Mean number of redbanded stink bugs (adults + nymphs) per 10 sweeps
Treatment/Formulation	Rate/acre (fl oz)	3 DAT^a	7 DAT	10 DAT
Endigo ZCX Low	4.0	5.8	1.8b	6.5b
Endigo ZCX High	4.5	6.0	1.5b	5.5b
A21550CP^b Low	1.6	8.0	1.3b	3.3b
A21550CP^b High	2.1	14.5	0.5b	4.3b
Orthene 97	1^c	5.0	1.3b	6.8b
Untreated check	–	17.0	4.8a	12.0a
P > F		0.0686	0.0076	0.0169

Means within a column followed by different letters are significantly different (LSD, P < 0.05).

^aDAT = days after treatment.

^bAll PLINAZOLIN technology treatments included the nonionic surfactant Dyne-Amic at 0.25% v/v.

^clbs product/A.

Table 1.

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Treatment/Formulation	Rate/acre (fl oz)	Mean number of redbanded stink bugs (adults + nymphs) per 10 sweeps
Treatment/Formulation	Rate/acre (fl oz)	3 DAT^a	7 DAT	10 DAT
Endigo ZCX Low	4.0	5.8	1.8b	6.5b
Endigo ZCX High	4.5	6.0	1.5b	5.5b
A21550CP^b Low	1.6	8.0	1.3b	3.3b
A21550CP^b High	2.1	14.5	0.5b	4.3b
Orthene 97	1^c	5.0	1.3b	6.8b
Untreated check	–	17.0	4.8a	12.0a
P > F		0.0686	0.0076	0.0169

Treatment/Formulation	Rate/acre (fl oz)	Mean number of redbanded stink bugs (adults + nymphs) per 10 sweeps
Treatment/Formulation	Rate/acre (fl oz)	3 DAT^a	7 DAT	10 DAT
Endigo ZCX Low	4.0	5.8	1.8b	6.5b
Endigo ZCX High	4.5	6.0	1.5b	5.5b
A21550CP^b Low	1.6	8.0	1.3b	3.3b
A21550CP^b High	2.1	14.5	0.5b	4.3b
Orthene 97	1^c	5.0	1.3b	6.8b
Untreated check	–	17.0	4.8a	12.0a
P > F		0.0686	0.0076	0.0169

Means within a column followed by different letters are significantly different (LSD, P < 0.05).

^aDAT = days after treatment.

^bAll PLINAZOLIN technology treatments included the nonionic surfactant Dyne-Amic at 0.25% v/v.

^clbs product/A.

Brown stink bug. There were no significant differences in the numbers (adults + nymphs) of brown stink bug at any sample date between the untreated check and other treatments (Table 2).

Table 2.

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Treatment/Formulation	Rate/acre (fl oz)	Mean number of brown stink bugs (adult + nymphs) per 10 sweeps
Treatment/Formulation	Rate/acre (fl oz)	3 DAT^a	7 DAT	10 DAT
Endigo ZCX Low	4.0	2.0	0.5	0.5
Endigo ZCX High	4.5	1.8	0.3	0.0
A21550CP^b Low	1.6	0.5	0.5	0.3
A21550CP^b High	2.1	1.8	0.0	0.0
Orthene 97	1^c	1.3	0.5	0.3
Untreated check	–	1.5	0.8	1.3
P > F		0.5679	0.4929	0.1650

Treatment/Formulation	Rate/acre (fl oz)	Mean number of brown stink bugs (adult + nymphs) per 10 sweeps
Treatment/Formulation	Rate/acre (fl oz)	3 DAT^a	7 DAT	10 DAT
Endigo ZCX Low	4.0	2.0	0.5	0.5
Endigo ZCX High	4.5	1.8	0.3	0.0
A21550CP^b Low	1.6	0.5	0.5	0.3
A21550CP^b High	2.1	1.8	0.0	0.0
Orthene 97	1^c	1.3	0.5	0.3
Untreated check	–	1.5	0.8	1.3
P > F		0.5679	0.4929	0.1650

Means within a column followed by different letters are significantly different (LSD, P < 0.05).

^aDAT = days after treatment.

^bAll PLINAZOLIN technology treatments included the nonionic surfactant Dyne-Amic at 0.25% v/v.

^clbs product/A.

Table 2.

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Treatment/Formulation	Rate/acre (fl oz)	Mean number of brown stink bugs (adult + nymphs) per 10 sweeps
Treatment/Formulation	Rate/acre (fl oz)	3 DAT^a	7 DAT	10 DAT
Endigo ZCX Low	4.0	2.0	0.5	0.5
Endigo ZCX High	4.5	1.8	0.3	0.0
A21550CP^b Low	1.6	0.5	0.5	0.3
A21550CP^b High	2.1	1.8	0.0	0.0
Orthene 97	1^c	1.3	0.5	0.3
Untreated check	–	1.5	0.8	1.3
P > F		0.5679	0.4929	0.1650

Treatment/Formulation	Rate/acre (fl oz)	Mean number of brown stink bugs (adult + nymphs) per 10 sweeps
Treatment/Formulation	Rate/acre (fl oz)	3 DAT^a	7 DAT	10 DAT
Endigo ZCX Low	4.0	2.0	0.5	0.5
Endigo ZCX High	4.5	1.8	0.3	0.0
A21550CP^b Low	1.6	0.5	0.5	0.3
A21550CP^b High	2.1	1.8	0.0	0.0
Orthene 97	1^c	1.3	0.5	0.3
Untreated check	–	1.5	0.8	1.3
P > F		0.5679	0.4929	0.1650

Means within a column followed by different letters are significantly different (LSD, P < 0.05).

^aDAT = days after treatment.

^bAll PLINAZOLIN technology treatments included the nonionic surfactant Dyne-Amic at 0.25% v/v.

^clbs product/A.

Southern green stink bug. At 3 and 10 DAT, there were no significant differences in southern green stink bug (adults + nymphs) numbers between the untreated check and other treatments. At 7 DAT, all treated plots had significantly lower southern green stink bug (adults + nymphs) pressure than the untreated plots (Table 3).

Table 3.

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Treatment/Formulation	Rate/acre (fl oz)	Mean number of southern green stink bugs (adult + nymphs) per 10 sweeps
Treatment/Formulation	Rate/acre (fl oz)	3 DAT^a	7 DAT	10 DAT
Endigo ZCX Low	4.0	0.3	0.3b	0.3
Endigo ZCX High	4.5	0.8	0.0b	0.8
A21550CP^b Low	1.6	0.3	0.0b	0.3
A21550CP^b High	2.1	1.8	0.0b	0.0
Orthene 97	1^c	1.0	0.5b	1.3
Untreated check	–	7.3	1.8a	0.5
P > F		0.1210	0.0072	0.6280

Treatment/Formulation	Rate/acre (fl oz)	Mean number of southern green stink bugs (adult + nymphs) per 10 sweeps
Treatment/Formulation	Rate/acre (fl oz)	3 DAT^a	7 DAT	10 DAT
Endigo ZCX Low	4.0	0.3	0.3b	0.3
Endigo ZCX High	4.5	0.8	0.0b	0.8
A21550CP^b Low	1.6	0.3	0.0b	0.3
A21550CP^b High	2.1	1.8	0.0b	0.0
Orthene 97	1^c	1.0	0.5b	1.3
Untreated check	–	7.3	1.8a	0.5
P > F		0.1210	0.0072	0.6280

Means within a column followed by different letters are significantly different (LSD, P < 0.05).

^aDAT = days after treatment.

^bAll PLINAZOLIN technology treatments included the nonionic surfactant Dyne-Amic at 0.25% v/v.

^clbs product/A.

Table 3.

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Treatment/Formulation	Rate/acre (fl oz)	Mean number of southern green stink bugs (adult + nymphs) per 10 sweeps
Treatment/Formulation	Rate/acre (fl oz)	3 DAT^a	7 DAT	10 DAT
Endigo ZCX Low	4.0	0.3	0.3b	0.3
Endigo ZCX High	4.5	0.8	0.0b	0.8
A21550CP^b Low	1.6	0.3	0.0b	0.3
A21550CP^b High	2.1	1.8	0.0b	0.0
Orthene 97	1^c	1.0	0.5b	1.3
Untreated check	–	7.3	1.8a	0.5
P > F		0.1210	0.0072	0.6280

Treatment/Formulation	Rate/acre (fl oz)	Mean number of southern green stink bugs (adult + nymphs) per 10 sweeps
Treatment/Formulation	Rate/acre (fl oz)	3 DAT^a	7 DAT	10 DAT
Endigo ZCX Low	4.0	0.3	0.3b	0.3
Endigo ZCX High	4.5	0.8	0.0b	0.8
A21550CP^b Low	1.6	0.3	0.0b	0.3
A21550CP^b High	2.1	1.8	0.0b	0.0
Orthene 97	1^c	1.0	0.5b	1.3
Untreated check	–	7.3	1.8a	0.5
P > F		0.1210	0.0072	0.6280

Means within a column followed by different letters are significantly different (LSD, P < 0.05).

^aDAT = days after treatment.

^bAll PLINAZOLIN technology treatments included the nonionic surfactant Dyne-Amic at 0.25% v/v.

^clbs product/A.

Stink bug complex. At 3 DAT, all treatments except A21550CP (2.1 oz/acre) had significantly lower stink bug numbers when compared with the untreated check. At 7 and 10 DAT, all treatments had significantly lower soybean stink bug (adults + nymphs) pressure than the untreated check (Table 4). At 7 DAT, A211550CP (2.1 oz/acre) plots had the lowest stink bug complex pressure of all treatments (Table 4). At 10 DAT, both rates (1.6 and 2.1 oz/acre) of A21550CP plots had the lowest stink bug complex pressure of all treatments (Table 4). All foliar treatments appear to be effective at reducing stink bug populations in soybeans. Further research should be conducted to investigate how well these chemistries perform during pod development and pod fill growth stages.¹

Table 4.

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Treatment/Formulation	Rate/acre (fl oz)	Mean number of total stink bugs (adult + nymphs) per 10 sweeps
Treatment/Formulation	Rate/acre (fl oz)	3 DAT^a	7 DAT	10 DAT
Endigo ZCX Low	4.0	8.0b	2.5b	7.3b
Endigo ZCX High	4.5	8.5b	1.8b	6.3b
A21550CP^b Low	1.6	8.8b	1.8b	3.8b
A21550CP^b High	2.1	18.0ab	0.5b	4.3b
Orthene 97	1^c	7.3b	2.3b	8.3b
Untreated check	–	25.8a	7.3a	13.8a
P > F		0.0168	<0.0001	0.0145

Treatment/Formulation	Rate/acre (fl oz)	Mean number of total stink bugs (adult + nymphs) per 10 sweeps
Treatment/Formulation	Rate/acre (fl oz)	3 DAT^a	7 DAT	10 DAT
Endigo ZCX Low	4.0	8.0b	2.5b	7.3b
Endigo ZCX High	4.5	8.5b	1.8b	6.3b
A21550CP^b Low	1.6	8.8b	1.8b	3.8b
A21550CP^b High	2.1	18.0ab	0.5b	4.3b
Orthene 97	1^c	7.3b	2.3b	8.3b
Untreated check	–	25.8a	7.3a	13.8a
P > F		0.0168	<0.0001	0.0145

Means within a column followed by different letters are significantly different (LSD, P < 0.05).

^aDAT = days after treatment.

^bAll PLINAZOLIN technology treatments included the nonionic surfactant Dyne-Amic at 0.25% v/v.

^clbs product/A.

Table 4.

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Treatment/Formulation	Rate/acre (fl oz)	Mean number of total stink bugs (adult + nymphs) per 10 sweeps
Treatment/Formulation	Rate/acre (fl oz)	3 DAT^a	7 DAT	10 DAT
Endigo ZCX Low	4.0	8.0b	2.5b	7.3b
Endigo ZCX High	4.5	8.5b	1.8b	6.3b
A21550CP^b Low	1.6	8.8b	1.8b	3.8b
A21550CP^b High	2.1	18.0ab	0.5b	4.3b
Orthene 97	1^c	7.3b	2.3b	8.3b
Untreated check	–	25.8a	7.3a	13.8a
P > F		0.0168	<0.0001	0.0145

Treatment/Formulation	Rate/acre (fl oz)	Mean number of total stink bugs (adult + nymphs) per 10 sweeps
Treatment/Formulation	Rate/acre (fl oz)	3 DAT^a	7 DAT	10 DAT
Endigo ZCX Low	4.0	8.0b	2.5b	7.3b
Endigo ZCX High	4.5	8.5b	1.8b	6.3b
A21550CP^b Low	1.6	8.8b	1.8b	3.8b
A21550CP^b High	2.1	18.0ab	0.5b	4.3b
Orthene 97	1^c	7.3b	2.3b	8.3b
Untreated check	–	25.8a	7.3a	13.8a
P > F		0.0168	<0.0001	0.0145

Means within a column followed by different letters are significantly different (LSD, P < 0.05).

^aDAT = days after treatment.

^bAll PLINAZOLIN technology treatments included the nonionic surfactant Dyne-Amic at 0.25% v/v.

^clbs product/A.

Footnotes

This research was supported in part by industry gifts of pesticides and/or research funding. The authors have no conflicts of interest.

This is an Open Access article distributed under the terms of the Creative Commons Attribution-NonCommercial License (https://creativecommons.org/licenses/by-nc/4.0/), which permits non-commercial re-use, distribution, and reproduction in any medium, provided the original work is properly cited. For commercial re-use, please contact [email protected] for reprints and translation rights for reprints. All other permissions can be obtained through our RightsLink service via the Permissions link on the article page on our site—for further information please contact [email protected].

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Efficacy of selected insecticides on the stink bug complex in Texas soybean, 2024

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