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Efficacy of Provado and Thiodan for Aphid Control, 1995

Efficacy of Provado and Thiodan for Aphid Control, 1995 Downloaded from https://academic.oup.com/amt/article-abstract/21/1/3/4639790 by DeepDyve user on 02 August 2020 A: POME FRUITS Arthropod Management Tests, Vol. 21 3 APPLE: Malus domestica Borkhauser, 'Delicious'. 'Gala', and 'Idared' Diane G. Alston (2A) Apple aphid; Aphis pomi De Geer Department of Biology Utah State University Logan, UT 84322-5305 (801) 797-2516 EFFICACY OF PROVADO AND THIODAN FOR APHID CONTROL, 1995: The trial was conducted in a 2-acre 5-yr-old mixed Delicious', 'Gala', and 'Idared' orchard with under-tree irrigation. Guthion 50W (2 lb form./acre) was applied for codling moth control on 2 and 16 Jun, 7 Jul, and 1 and 22 Aug with an air blast sprayer. The experimental design was a RCB with 5 single-tree replicates per treatment. There were two or more buffer trees within rows between treated trees. Dilute sprays were applied to runoff with a handgun sprayer operated at 150-200 psi. Per acre rates were based on application of 1 gal of spray per tree or 182 gal/acre. Aphids (alate + apterous) were counted in situ on the three most recently fully expanded leaves (minimum of 1 inch in length and edges completely unfolded) on three terminals per tree. Pre-treatment counts were made on 20 Jun. All aphicide treatments were applied on 21 Jun, except one follow-up Thiodan application on 10 Jul (19 DAT). Post-treatment counts were made 5, 12, 19, 26, and 34 DAT. Initial counts were low to moderate and not different among treatments. All aphicide treatments significantly reduced aphid densities below untreated levels through 10 Jul (19 DAT). There were no differences in aphid control among the five aphicide treatments. Later, on 17 and 25 Jul (26 and 34 DAT, respectively), aphid densities in aphicide treatments did not differ from those in untreated trees. Treatment/ Rate (form) Formation per acre 20 Jun 26 Jun 3 Jul 10 Jul 17 Jul 25 Jul 4 fl oz 65.7 a 0.4 b 13.4 b 10.9 a Provado 1.6F 9.1 b 55.3 a 8 fl oz 64.1 a 10.1 b Provado 1.6F 1.8 b 23.1 b 4.5 a 47.1 a 4 fl oz 64.4 a Provado 1.6F+ 3.5 b 16.0 b 3.3 b 6.9 a 58.9 a 1.82 lb Thiodan 50W Provado 1.6F+ 4 fl oz 11.9 b 27.7 a 70.5 a 0.5 b 18.2 b 128.8 a 1.82 lb Thiodan 50W 1.82 lb 9.6 b Thiodan 50W 104.2 a 0.3 b 11.7 b 8.6 a 58.5 a Untreated 49.7 a 93.2 a 270.4 a 99.3 a 38.4 a 168.5 a Means within a column followed by the same letter are not significantly different (Tukey's studentized range test at alpha = 0.05). •Thiodan 50W applied on 10 Jul, 19 DAT. APPLE: Malus domestica Borkhauser 'Scarlet' E. H. Beers (3A) Apple aphid; Aphis pomi De Geer Washington State University Tree Fruit Res. & Extension Center 1100N . Western Ave. Wenatchee, WA 98801 (509) 663-8181 ext. 234 EFFECT OF REGISTERED AND EXPERIMENTAL APHICIDES ON APHIS POMI, 1995: This experiment was conducted in a first leaf commercial 'Scartlet' orchard on M.7 rootstock near Malaga, WA. Plots consisted of single trees, with buffer trees between trees. Two shoots per tree were tagged, and all counts were taken from tagged shoots. The aphid population on the shoot was assessed by counting individual aphids on the most infested leaf on the shoot. Pre-treatment counts were used as a blocking factor for randomization. Treatments were applied with a handgun to the point of drip on 25 Jul. Post-treatment counts were taken ca. weekly until late Aug. Initial aphid populations were substantial, and were consistent with levels that would normally trigger control treatments by commercial growers. Populations in the check declined steadily, but provided enough reinfestation pressure to test residual control by the test compounds. RH-7988 provided season-long aphid control at both rates tested. Pirimor provided a similar level of control at all rates except the lowest tested. Neemix provided some suppression relative to the check, but activity was considerably slower than other materials, and there was a significant residual aphid population. CGA 215944 (Sterling) did not reduce aphid population relative to the check at either rate tested. Residual control is an important consideration on young trees, which typically provide the terminal growth necessary for continuous aphid infestation throughout the season. Aphids per most infested leaf Rate Compound 21 Jul 31 Jul" 14 Aug" 22 Aug 30 Aug form/acre 7 Aug" CGA 215944 50WP 0.30 lb 328.00 a 156.25 a 112.50 a 17.50 ab 0.00 a 0.88 a CGA 215944 50WP 0.44 lb 80.88 be 39.13 a 0.00 a 0.13 a 378.50 a 93.88 ab RH-7988 50W+ 0.250 lb 0.00 d 0.00 b 0.00 a 0.00 a 385.00 a 1.00 d oil 1 gal RH-7988 50W+ 0.376 lb 353.50 a 0.13 d 0.25 d 0.50 b 0.00 a 0.75 a oil 1 gal RH-7988 50W+ 0.500 lb 360.88 a 0.00 d 0.00 d 0.00 b 0.00 a 0.25 a oil 1 gal Continued http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Arthropod Management Tests Oxford University Press

Efficacy of Provado and Thiodan for Aphid Control, 1995

Alston, Diane, G.
Arthropod Management Tests , Volume 21 (1) – Jan 1, 1996
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Oxford University Press
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© Entomological Society of America.
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2155-9856
DOI
10.1093/amt/21.1.3
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Abstract

Downloaded from https://academic.oup.com/amt/article-abstract/21/1/3/4639790 by DeepDyve user on 02 August 2020 A: POME FRUITS Arthropod Management Tests, Vol. 21 3 APPLE: Malus domestica Borkhauser, 'Delicious'. 'Gala', and 'Idared' Diane G. Alston (2A) Apple aphid; Aphis pomi De Geer Department of Biology Utah State University Logan, UT 84322-5305 (801) 797-2516 EFFICACY OF PROVADO AND THIODAN FOR APHID CONTROL, 1995: The trial was conducted in a 2-acre 5-yr-old mixed Delicious', 'Gala', and 'Idared' orchard with under-tree irrigation. Guthion 50W (2 lb form./acre) was applied for codling moth control on 2 and 16 Jun, 7 Jul, and 1 and 22 Aug with an air blast sprayer. The experimental design was a RCB with 5 single-tree replicates per treatment. There were two or more buffer trees within rows between treated trees. Dilute sprays were applied to runoff with a handgun sprayer operated at 150-200 psi. Per acre rates were based on application of 1 gal of spray per tree or 182 gal/acre. Aphids (alate + apterous) were counted in situ on the three most recently fully expanded leaves (minimum of 1 inch in length and edges completely unfolded) on three terminals per tree. Pre-treatment counts were made on 20 Jun. All aphicide treatments were applied on 21 Jun, except one follow-up Thiodan application on 10 Jul (19 DAT). Post-treatment counts were made 5, 12, 19, 26, and 34 DAT. Initial counts were low to moderate and not different among treatments. All aphicide treatments significantly reduced aphid densities below untreated levels through 10 Jul (19 DAT). There were no differences in aphid control among the five aphicide treatments. Later, on 17 and 25 Jul (26 and 34 DAT, respectively), aphid densities in aphicide treatments did not differ from those in untreated trees. Treatment/ Rate (form) Formation per acre 20 Jun 26 Jun 3 Jul 10 Jul 17 Jul 25 Jul 4 fl oz 65.7 a 0.4 b 13.4 b 10.9 a Provado 1.6F 9.1 b 55.3 a 8 fl oz 64.1 a 10.1 b Provado 1.6F 1.8 b 23.1 b 4.5 a 47.1 a 4 fl oz 64.4 a Provado 1.6F+ 3.5 b 16.0 b 3.3 b 6.9 a 58.9 a 1.82 lb Thiodan 50W Provado 1.6F+ 4 fl oz 11.9 b 27.7 a 70.5 a 0.5 b 18.2 b 128.8 a 1.82 lb Thiodan 50W 1.82 lb 9.6 b Thiodan 50W 104.2 a 0.3 b 11.7 b 8.6 a 58.5 a Untreated 49.7 a 93.2 a 270.4 a 99.3 a 38.4 a 168.5 a Means within a column followed by the same letter are not significantly different (Tukey's studentized range test at alpha = 0.05). •Thiodan 50W applied on 10 Jul, 19 DAT. APPLE: Malus domestica Borkhauser 'Scarlet' E. H. Beers (3A) Apple aphid; Aphis pomi De Geer Washington State University Tree Fruit Res. & Extension Center 1100N . Western Ave. Wenatchee, WA 98801 (509) 663-8181 ext. 234 EFFECT OF REGISTERED AND EXPERIMENTAL APHICIDES ON APHIS POMI, 1995: This experiment was conducted in a first leaf commercial 'Scartlet' orchard on M.7 rootstock near Malaga, WA. Plots consisted of single trees, with buffer trees between trees. Two shoots per tree were tagged, and all counts were taken from tagged shoots. The aphid population on the shoot was assessed by counting individual aphids on the most infested leaf on the shoot. Pre-treatment counts were used as a blocking factor for randomization. Treatments were applied with a handgun to the point of drip on 25 Jul. Post-treatment counts were taken ca. weekly until late Aug. Initial aphid populations were substantial, and were consistent with levels that would normally trigger control treatments by commercial growers. Populations in the check declined steadily, but provided enough reinfestation pressure to test residual control by the test compounds. RH-7988 provided season-long aphid control at both rates tested. Pirimor provided a similar level of control at all rates except the lowest tested. Neemix provided some suppression relative to the check, but activity was considerably slower than other materials, and there was a significant residual aphid population. CGA 215944 (Sterling) did not reduce aphid population relative to the check at either rate tested. Residual control is an important consideration on young trees, which typically provide the terminal growth necessary for continuous aphid infestation throughout the season. Aphids per most infested leaf Rate Compound 21 Jul 31 Jul" 14 Aug" 22 Aug 30 Aug form/acre 7 Aug" CGA 215944 50WP 0.30 lb 328.00 a 156.25 a 112.50 a 17.50 ab 0.00 a 0.88 a CGA 215944 50WP 0.44 lb 80.88 be 39.13 a 0.00 a 0.13 a 378.50 a 93.88 ab RH-7988 50W+ 0.250 lb 0.00 d 0.00 b 0.00 a 0.00 a 385.00 a 1.00 d oil 1 gal RH-7988 50W+ 0.376 lb 353.50 a 0.13 d 0.25 d 0.50 b 0.00 a 0.75 a oil 1 gal RH-7988 50W+ 0.500 lb 360.88 a 0.00 d 0.00 d 0.00 b 0.00 a 0.25 a oil 1 gal Continued

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Arthropod Management Tests – Oxford University Press

Published: Jan 1, 1996

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