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John C Wise, Celeste E Wheeler, Anthony H VanWoerkom, Rufus Isaacs, Control of Putnam Scale in Blue Crop Blueberry, 2018, Arthropod Management Tests, Volume 45, Issue 1, 2020, tsaa033, https://doi.org/10.1093/amt/tsaa033
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The objective of this study was to evaluate the efficacy of several insecticide rates and timings against Putnam Scale on blueberry. Six bush plots were established in a 8-year-old ‘Blue Crop’ blueberry planting (row spacing 12′ × 4′) located at the Trevor Nichols Research Center in Fennville MI (Blue Crop Block). There were four replicated plots per treatment, set up in an RCB design. Test materials were applied with an FMC 1029 tractor-mounted airblast sprayer calibrated to deliver 50 GPA at 2.5 mph. Rates and timings of test materials are as outlined in Table 1. In addition, regular maintenance foliar applications were applied to all treatments including Abound F, Alliette WDG, Indar 2F, Luna Tranquility F, and Pristine DF. Also, Callisto L and Karmex 80DF were banded below the rows for weed control.
| Treatment/formulation . | Rate product/acre . | Appl Code . | Putnam scale % infestation per 50 shoots . | Putnam scale % infestation per 50 shoots . | Putnam scale % infestation per 50 shoots . |
|---|---|---|---|---|---|
| . | . | . | 11 Jul . | 15 Aug . | 6 Sep . |
| Untreated | 71.3 a | 83.3 a | 81.3 a | ||
| Centaur 70 WDG | 46 oz | A | 30.6 b | 32.6 b | 28.0 b |
| Centaur 70 WDG | 46 oz | B | 22.0 b | 27.3 b | 13.3 b |
| Sivanto Prime 200 SL | 10.5 fl oz | A | 20.6 b | 36.0 b | 23.3 b |
| Sivanto Prime 200 SL | 10.5 fl oz | B | 28.0 b | 34.6 b | 20.7 b |
| Esteem 35 WP | 5 oz | A | 18.0 b | 25.3 b | 13.3 b |
| Esteem 35 WP | 5 oz | B | 19.3 b | 24.6 b | 13.3 b |
| Treatment/formulation . | Rate product/acre . | Appl Code . | Putnam scale % infestation per 50 shoots . | Putnam scale % infestation per 50 shoots . | Putnam scale % infestation per 50 shoots . |
|---|---|---|---|---|---|
| . | . | . | 11 Jul . | 15 Aug . | 6 Sep . |
| Untreated | 71.3 a | 83.3 a | 81.3 a | ||
| Centaur 70 WDG | 46 oz | A | 30.6 b | 32.6 b | 28.0 b |
| Centaur 70 WDG | 46 oz | B | 22.0 b | 27.3 b | 13.3 b |
| Sivanto Prime 200 SL | 10.5 fl oz | A | 20.6 b | 36.0 b | 23.3 b |
| Sivanto Prime 200 SL | 10.5 fl oz | B | 28.0 b | 34.6 b | 20.7 b |
| Esteem 35 WP | 5 oz | A | 18.0 b | 25.3 b | 13.3 b |
| Esteem 35 WP | 5 oz | B | 19.3 b | 24.6 b | 13.3 b |
Means followed by same letter do not significantly differ (P ≤ 0.05, Tukey’s HSD). ANOVA performed on square-root transformed data; data presented are actual counts. A = 21 Jun (Crawler Stage), B = 1 Aug (2nd Crawler Stage).
| Treatment/formulation . | Rate product/acre . | Appl Code . | Putnam scale % infestation per 50 shoots . | Putnam scale % infestation per 50 shoots . | Putnam scale % infestation per 50 shoots . |
|---|---|---|---|---|---|
| . | . | . | 11 Jul . | 15 Aug . | 6 Sep . |
| Untreated | 71.3 a | 83.3 a | 81.3 a | ||
| Centaur 70 WDG | 46 oz | A | 30.6 b | 32.6 b | 28.0 b |
| Centaur 70 WDG | 46 oz | B | 22.0 b | 27.3 b | 13.3 b |
| Sivanto Prime 200 SL | 10.5 fl oz | A | 20.6 b | 36.0 b | 23.3 b |
| Sivanto Prime 200 SL | 10.5 fl oz | B | 28.0 b | 34.6 b | 20.7 b |
| Esteem 35 WP | 5 oz | A | 18.0 b | 25.3 b | 13.3 b |
| Esteem 35 WP | 5 oz | B | 19.3 b | 24.6 b | 13.3 b |
| Treatment/formulation . | Rate product/acre . | Appl Code . | Putnam scale % infestation per 50 shoots . | Putnam scale % infestation per 50 shoots . | Putnam scale % infestation per 50 shoots . |
|---|---|---|---|---|---|
| . | . | . | 11 Jul . | 15 Aug . | 6 Sep . |
| Untreated | 71.3 a | 83.3 a | 81.3 a | ||
| Centaur 70 WDG | 46 oz | A | 30.6 b | 32.6 b | 28.0 b |
| Centaur 70 WDG | 46 oz | B | 22.0 b | 27.3 b | 13.3 b |
| Sivanto Prime 200 SL | 10.5 fl oz | A | 20.6 b | 36.0 b | 23.3 b |
| Sivanto Prime 200 SL | 10.5 fl oz | B | 28.0 b | 34.6 b | 20.7 b |
| Esteem 35 WP | 5 oz | A | 18.0 b | 25.3 b | 13.3 b |
| Esteem 35 WP | 5 oz | B | 19.3 b | 24.6 b | 13.3 b |
Means followed by same letter do not significantly differ (P ≤ 0.05, Tukey’s HSD). ANOVA performed on square-root transformed data; data presented are actual counts. A = 21 Jun (Crawler Stage), B = 1 Aug (2nd Crawler Stage).
A field evaluation consisting of 50 randomly selected shoots per plot was made on 11 Jul, 15 Aug, and 6 Sep. The number of shoots with Putnam Scale were counted. Results are shown as the percent of shoots with Putnam Scale (Table 1). All data were analyzed using ANOVA and means separation by Tukey’s HSD at P = 0.05. ANOVA was run on transformed data, while actual counts are presented.
All treatment compounds and timings provided significant reductions of Putnam scale infestations in blueberries (Table 1).1
Footnotes
This research was supported by industry gifts of pesticides and research funding.
