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Control of Cabbage Pests, Summer, 1993

Control of Cabbage Pests, Summer, 1993 Downloaded from https://academic.oup.com/amt/article-abstract/19/1/68/4639250 by DeepDyve user on 02 August 2020 68 Arthropod Management Tests, Vol. 19 E: VEGETABLE CROPS CABBAGE: Brassica oleracea L. 'Blue Vantage' S. Rowland and B. Cartwright (18E) Cabbage looper (CL); Trichoplusia ni (HUbner) Department of Entomology Tobacco thrips; Frankliniella fusca (Hinds) Oklahoma State University Harlequin bug (HB); Murgantia histrionica (Hahn) P.O. Box 128 Lane, OK 74555 CONTROL OF CABBAGE PESTS, SUMMER, 1993: Greenhouse grown cabbage plants were transplanted on 27 Apr into a Bernow series sandy loam soil at the Wes Watkins AREC in Lane, OK. Plots measuring one row wide by 4.6 m long were arranged in a randomized complete block design with four replications. Spray buffers of one row between rows and 3 m within rows were left unplanted. Double-row beds were spaced 0.9 m apart with 30 cm interplant spacing. Conventional cultural practices were used throughout the trial. All treatments were applied on 26 May, 4, 14 and 24 Jun with a C0 -powered backpack sprayer calibrated on 3 May at 205 liters per acre. The boom was configured with two TX-26 (hollow cone) spray nozzles spaced 46 cm apart and directed inward towards the base of the plants. On each sample date, five randomly selected plants per plot were sampled for CL, thrips and HB. All heads were harvested on 2 Jul and evaluated for insect damage according to the following scale: 1 = no wrapper leaf damage, no head damage, 2 = wrapper leaf damage, no head damage, 3 = light head damage (3 or less feeding holes), 4 = moderate/severe head damage (>3 feeding holes). Heads rated 1 or 2 were considered marketable in accordance with USDA market standards. CL populations were moderate, but consistent through the season. The mean number of CL larvae was 2.0 larvae per plant and peaked on 26 May at 3.7 larvae per plant. All treatments significantly reduced CL on 28 May and 7 Jun compared with untreated plots. Consistently lower levels of CL were observed in the Brigade 10WP treatment throughout the season. All treatments except Fury 1.5 EC @ 0.038 lbs Al/acre and Larvin 80DF @ 0.8 lbs Al/acre significantly reduced seasonal mean number of CL larvae. Efficacy of Fury 1.5 EC for controlling all pests appeared to be affected by rate. No differences were detected between the Karate IE @ 0.025 lbs Al/acre and Karate IE @ 0.0125 lbs Al/acre + Cutlass WP treatments. When compared with untreated plots, all treatments except Ammo 2.5 EC, Thiodan 3EC and Larvin 80DF @ 0.8 lbs Al/acre significantly reduced seasonal numbers of thrips while all treatments significantly reduced HB populations. All treatments significantly reduced damage compared with the untreated control. Heads harvested from Brigade 10WP and Karate IE plots were rated as free from damage. Heads harvested from plots treated with Ammo 2.5 EC, Fury 1.5 EC @ 0.038 lbs Al/acre, Larvin 80DF @ 0.8 lbs Al/acre and 1.0 lbs Al/acre had very little damage and were all classified as marketable. No phytotoxicity was observed with any of the treatments. Mean no. cabbage looper larvae per five plants Rate Ml 26 May 28 May 2 . un 7 Jun 0 Jun 16 Jun 22 Jun 29 Jun Treatment acre pretreat 2 DAT 7 DAT 3 DAT 6 DAT 2 DAT 8 DAT 5 DAT Brigade 10 WP 0.08 18.75 ± 6.10 a 0.50 ± 0.50 b 0.00 ± 0.00 b 1.00 ± 0.58 b 1.50 ± 0.96 ab 0.75 ± 0.48 a 0.00 ± 0.00 b 0.00 ± 0.00 b Ammo 2.5 EC 0.08 21.50 ± 8.25 a 1.50 ± 0.65 b 2.50 ± 0.87 ab 3.00 ± 1.08 b 0.00 ± 0.00 b 4.25 ± 3.59 a 2.75 ± 1.11 b 0.75 ± 0.48 b Fury 1.5 EC 0.038 23.75 ± 9.53 a 6.00 ± 1.78 b 3.50 ± 2.87 ab 2.25 ± 1.65 b 0.25 ± 0.25 b 10.25 ± 6.01 a 5.50 ± 3.88 ab 2.25 ± 0.48 ab Fury 1.5 EC 0.05 24.25 ± 9.91 a 3.00 ± 0.91 b 2.00 ± 1.41 ab 2.75 ± 1.60 b 0.50 ± 0.50 b 3.00 ± 1.91 a 2.75 ± 1.38 b 0.50 ± 0.50 b Pounce 3.2 EC 0.20 20.00 ± 6.99 a 1.25 ± 0.48 b 1.75 ± 1.11 ab 3.50 ± 0.96 b 1.75 ± 0.85 ab 4.25 ± 1.84 a 2.50 ± 0.65 b 0.25 ± 0.25 b Thiodan 3EC 1.0 20.00 ± 7.49 a 3.75 ± 1.75 b 3.50 ± 2.87 ab 4.25 ± 1.75 b 1.25 ± 1.25 ab 1.75 ± 1.75 a 3.75 ± 1.31 ab 1.25 ± 0.75 b Karate IE 0.025 21.75 ± 4.09 a 1.25 ± 0.75 b 2.75 ± 1.89 ab 0.75 ± 0.25 b 0.25 ± 0.25 b 2.75 ± 1.60 a 2.75 ± 1.18b 0.00 ± 0.00 b Larvin 80DF 0.6 18.00 ± 4.88 a 1.75 ± 1.11 b 3.50 ± 0.96 ab 6.25 ± 1.97 b 3.00 ± 1.22 ab 4.00 ± 2.48 a 7.00 ± 1.58 ab 4.00 ± 1.78 ab Larvin 80DF 0.8 22.50 ± 6.50 a 4.00 ± 1.68 b 5.75 ± 1.80 ab 2.25 ± 1.11 b 1.75 ± 1.44 ab 7.75 ± 3.82 a 5.75 ± 2.53 ab 3.25 ± 14 9 ab Larvin 80DF 1.0 18.25 ± 4.80 a 3.25 ± 0.85 b 2.50 ± 1.19 ab 1.75 ± 1.03 b 1.00 ± 0.71 ab 3.50 ± 2.22 a 5.25 ± 1.93 ab 3.25 ± 1.97 ab Karate IE + 0.0125 ± 10.93 a 0.75 ± 0.48 b 3.00 ± 1.41 ab ± 1.03 b ± 0.25 b 2.00 ± ± 0.65 b 0.50 ± 26.75 2.25 0.25 1.08 a 2.50 0.29 b Cutlass WP 0.5 Untreated 18.50 ± 6.96 a 11.25 ± 2.95 a 7.50 ± 3.30 a 12.00 ± 2.20 a 4.25 ± 1.03 a 9.00 ± 3.08 a 11.75 ± 4.33 a 6.25 ± 1.65 a Means ( ± SE) within a column followed by the same letter are not significantly different, SAS (REGWQ P < 0.10). Seasonal means per five plants Rate Treatment lb Al/acre CL eggs CL larvae Thrips Harlequin bugs Brigade 10 WP 0.08 6.59 2.32 a 2.81 ± 1.28 b 0.05b 0.19 0.13 b 0.09 Ammo 2.5 EC 0.08 4.59 1.26 a 4.53 ± 1.55 b 0.52 ab 0.13 0.06 b 0.97 Fury 1.5 EC 0.038 4.56 1.13a 6.72 ± 1.87 ab 0.23 b 0.38 0.20 b 0.41 Fury 1.5 EC 0.05 5.09 1.23 a 4.84 ± 1.76 b 0.25 0.13 b 0.25 0.13 b Pounce 3.2 EC 0.20 6.84 1.84 a 4.41 ± 1.36 b 0.72 0.33 b 0.16 0.11 b Thiodan 3EC 1.0 4.72 1.14a 4.94 ± 1.42 b 1.25 0.62 ab 0.09 0.07 b Karate IE 0.025 6.56 1.36 a 4.03 ± 1.34 b 0.59 0.32 b 0.09 0.07 b Larvin 80DF 0.6 3.94 1.21 a 5.94 ± 1.13b 0.81 0.48 b 0.03 0.03 b Larvin 80DF 4.44 0.94 a 1.48 ab 0.59 ab 0.38 0.29 b 0.8 6.63 ± 1.28 Larvin 80DF 3.91 0.78 a 1.16b 0.23 b 0.25 0.22 b 1.0 4.84 ± 0.50 Karate IE + 0.0125 7.31 1.76 a 4.75 ± 1.94 b 0.53 0.27 b 0.03 ± 0.03 b Cutlass WP 0.5 Untreated 4.94 1.46 a 10.06 ± 1.35 a 4.50 3.08 a 2.09 ± 0.81 a Means (± SE) within a column followed by the same letter are not significantly different, SAS (REGWQ, P < 0.10). Downloaded from https://academic.oup.com/amt/article-abstract/19/1/68/4639250 by DeepDyve user on 02 August 2020 E: VEGETABLE CROPS Arthropod Management Tests, Vol. 19 69 Rate % Marketable Weight per Insect damage Treatment lb Al/acre heads head (Kg) rating Brigade 10WP 0.08 100.0 0.0 a 0.49 0.09 a 1.00 0.00 c ± ± Ammo 2.5 EC 0.08 100.0 ± 0.0 a 0.45 0.08 a 1.04 ± 0.03 c Fury 1.5 EC 0.038 100.0 ± 0.0 a 0.44 0.05 a 1.07 ± 0.05 c Fury 1.5 EC + 0.05 97.1 ± 2.9 a 0.46 0.04 a 1.10 ± 0.05 c Pounce 3.2 EC + 0.20 86.5 8.7 a 0.51 0.03 a 1.30 0.18 c ± ± Thiodan 3EC 1.0 78.4 ± 8.8 a 0.50 ± 0.00 a 1.66 ± 0.18 b Karate IE 0.025 100.0 ± 0.0 a 0.47 ± 0.02 a 1.00 ± 0.00 c Larvin 80DF 0. 6 89.6 ± 9.5 a 0.40 ± 0.07 a 1.28 ± 0.17 c Larvin 80DF 0. 8 100.0 0.0 a 0.45 0.06 a 1.03 0.02 c ± ± ± Larvin 80DF 1.0 100.0 ± 0.0 a 0.41 ± 0.07 a 1.10 ± 0.10 c Karate IE + 0.0125 98.7 ± 1.3a 0.47 0.03 a 1.04 ± 0.03 c Cutlass WP 0.5 Untreated 0. 0 ± 0.0 b 0.32 0.01 a 3.99 ± 0.01 a Means (± SE) within a column followed by the same letter are not significantly different, SAS (REGWQ, P = 0.10). CABBAGE: Brassica oleracea L. 'Blue Vantage' S. Rowland and B. Cartwright (19E) Cabbage looper (CL): Trichoplusia ni (Htibner) Department of Entomology Diamondback moth (DBM): Plutella xylostella (L.) Oklahoma State University P.O. Box 128 Lane, OK 74555 CONTROL OF CABBAGE LOOPER AND DIAMONDBACK MOTH ON CABBAGE, SPRING, 1993: Six week old cabbage plants were transplanted into a Bernow series sandy loam soil on 29 Mar at the Wes Watkins AREC Lane, OK. Plots one row wide by 4.6 m long were arranged in a randomized complete block design with four replications. One unplanted row between rows and 3 m within rows served as spray buffers. Double- row beds were spaced 0.9 m apart with 30 cm between plants within rows. Standard cultural practices were used throughout the trial. All treatments were applied on 4, 14, 19 and 25 May and 2, 10 Jun using a C0 -powered backpack sprayer calibrated on 3 May @ 205.2 liters per acre. The sprayer was equipped with two TX-26 (hollow cone) spray nozzles spaced 46 cm apart and directed inward towards the base of the plants. On each sample date, five randomly selected plants per plot were sampled for CL, DBM and other lepidopterous larvae. Larvae were categorized as small (CL: instar 1 or 2; DBM—instar 1, 2 or 3) or large (CL—instar 3 or 4; DBM—instar 4, 5 or 6). All heads were harvested on 2 Jul and evaluated for insect feeding damage according to the following scale: 1 = no wrapper leaf damage, no head damage, 2 = wrapper leaf damage, no head damage, 3 = light head damage (3 or less feeding holes), 4 = moderate/severe head damage (>3 feeding holes). Heads rated 1 or 2 were considered marketable in accordance with USDA market standards. CL populations were high with populations increasing to 7.75 larvae per plant in untreated plots on 24 May. DBM populations were lower with the peak of 1.25 larvae per plant in untreated plots observed on 18 May. The seasonal mean number of CL eggs was significantly lower in plots treated with Condor OF. Slightly lower levels of CL (small and large) larvae were observed in the Condor OF treatment throughout the season. Efficacy of ECX 9371 AF and ECX 9348 AF for reducing numbers of large CL appeared to be affected by rate. Compared with untreated plots, all treatments significantly reduced the season mean number of DBM. A rate effect can also be seen for the seasonal mean number of DBM between Cutlass WP, with numbers of larvae decreasing with increasing rates. A significant reduction of the overall lepidopterous population was seen on 24 May and in the seasonal mean for Condor OF plots when compared with the untreated check. However, rate effects of Cutlass WP, ECX 9371 AF and ECX 9348 AF are not apparent when all lepidopterous species are combined. All treatments had significantly higher percentages of marketable heads and lower damage ratings when compared with untreated plots. Improved efficacy with increasing rates was observed with Cutlass WP and ECX 9371 AF as measured by damage ratings. No phytotoxicity was observed with any of the treatments. CL eggs per five plants 24 May Rate/ 3 May 7 May 12 May 18 May 1 Jun 8 Jun Seasonal Treatment 3 DAT 4 DAT 5 DAT 6 DAT mean acre pre trea t 8 DAT 7 DAT Cutlass WP 1.0 1b 15.50 ± 7.49 a 25.25 ± 8.50 a 17.25 ± 7.09 a 11.50 ± 1.85 be 3.00 ± 1.22 a 2.50 ± 0.96 a 1.50 ± 0.87 ab 10.93 ± 2.35 ab 10.14 ± Cutlass WP 1.5 lbs 10.50 ± 3.50 a 23.75 ± 3.33 a 8.50 ± 3.52 a 14.75 ± 4.64 be 6.75 ± 2.78 a 3.75 ± 2.06 a 3.00 ± 1.41 ab 1.67 ab ECX 9371 AF 1.0 qt 13.50 ± 3.28 a 32.00 ± 12.22 a 9.50 ± 3.93 a 30.75 ± 7.73 ab 3.75 + 2.46 a 1.50 ± 0.96 a 4.00 ± 1.58 ab 12.89 ± 2.83 ab ECX 9371 AF 2.0 qts 11.75 ± 3.71 a 20.25 ± 5.95 a 13.25 ± 6.41 a 36.25 ± 4.25 a 3.00 ± 1.08 a 0.50 ± 0.29 a 2.00 ± 1.41 ab 12.43 ± 2.63 ab ECX 9371 AF 3.0 qts 18.00 ± 2.16 a 22.25 ± 5.84 a 15.00 ± 5.12 a 29.00 ± 9.38 ab 4.75 ± 1.89 a 5.50 ± 2.25 a 3.75 ± 2.39 ab 14.04 ± 2.38 a ECX 9348 AF 1.0 qt 11.75 ± 1.80 a 24.75 ± 2.53 a 7.50 ± 2.87 a 13.75 ± 1.93 be 5.00 ± 2.86 a 2.25 ± 1.60 a 5.00 ± 2.12 ab 10.00 ± 1.56 ab ECX 9348 AF 2.0 qts 12.50 ± 2.63 a 26.75 ± 5.28 a 13.25 ± 3.97 a 22.00 ± 3.85 abc 3.50 ± 2.25 a 2.50 ± 1.19 a 8.00 ± 4.10 a 12.64 ± 2.01 ab ECX 9348 AF 3.0 qts 13.75 ± 4.87 a 21.75 ± 2.95 a 11.00 ± 4.43 a 21.50 ± 5.42 abc 7.75 ± 6.42 a 2.50 ± 2.50 a 3.00 ± 1.29 ab 11.61 ± 2.02 ab Condor OF 1.0 qt 13.00 ± 3.65 a 16.75 ± 5.72 a 8.00 ± 5.90 a 7.00 ± 2.48 be 1.50 ± 0.87 a 0.50 ± 0.50 a 0.25 ± 0.25 b 6.71 ± 1.65 b Javelin WG 1.0 1b 9.50 ± 3.93 a 37.75 ± 8.05 a 20.50 ± 8.80 a 20.00 ± 3.03 abc 3.00 ± 2.04 a 3.50 ± 1.55 a 1.25 ± 0.25 ab 13.64 ± 2.89 a Untreated 11.75 ± 2.46 a 19.75 ± 10.55 a 17.75 ± 1.03 abc 2.75 ± 1.03 a 1.75 ± 0.85 a 1.75 ± 0.63 ab 9.57 ± 2.04 ab — 11.50 ± 5.06 a Means ( ± SE) within a column followed by the same letter are not significantly different, SAS (REGWQ, P £ 0.10). http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Arthropod Management Tests Oxford University Press

Control of Cabbage Pests, Summer, 1993

Arthropod Management Tests , Volume 19 (1) – Jan 1, 1994

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© 1994, Entomological Society of America
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2155-9856
DOI
10.1093/amt/19.1.68
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Abstract

Downloaded from https://academic.oup.com/amt/article-abstract/19/1/68/4639250 by DeepDyve user on 02 August 2020 68 Arthropod Management Tests, Vol. 19 E: VEGETABLE CROPS CABBAGE: Brassica oleracea L. 'Blue Vantage' S. Rowland and B. Cartwright (18E) Cabbage looper (CL); Trichoplusia ni (HUbner) Department of Entomology Tobacco thrips; Frankliniella fusca (Hinds) Oklahoma State University Harlequin bug (HB); Murgantia histrionica (Hahn) P.O. Box 128 Lane, OK 74555 CONTROL OF CABBAGE PESTS, SUMMER, 1993: Greenhouse grown cabbage plants were transplanted on 27 Apr into a Bernow series sandy loam soil at the Wes Watkins AREC in Lane, OK. Plots measuring one row wide by 4.6 m long were arranged in a randomized complete block design with four replications. Spray buffers of one row between rows and 3 m within rows were left unplanted. Double-row beds were spaced 0.9 m apart with 30 cm interplant spacing. Conventional cultural practices were used throughout the trial. All treatments were applied on 26 May, 4, 14 and 24 Jun with a C0 -powered backpack sprayer calibrated on 3 May at 205 liters per acre. The boom was configured with two TX-26 (hollow cone) spray nozzles spaced 46 cm apart and directed inward towards the base of the plants. On each sample date, five randomly selected plants per plot were sampled for CL, thrips and HB. All heads were harvested on 2 Jul and evaluated for insect damage according to the following scale: 1 = no wrapper leaf damage, no head damage, 2 = wrapper leaf damage, no head damage, 3 = light head damage (3 or less feeding holes), 4 = moderate/severe head damage (>3 feeding holes). Heads rated 1 or 2 were considered marketable in accordance with USDA market standards. CL populations were moderate, but consistent through the season. The mean number of CL larvae was 2.0 larvae per plant and peaked on 26 May at 3.7 larvae per plant. All treatments significantly reduced CL on 28 May and 7 Jun compared with untreated plots. Consistently lower levels of CL were observed in the Brigade 10WP treatment throughout the season. All treatments except Fury 1.5 EC @ 0.038 lbs Al/acre and Larvin 80DF @ 0.8 lbs Al/acre significantly reduced seasonal mean number of CL larvae. Efficacy of Fury 1.5 EC for controlling all pests appeared to be affected by rate. No differences were detected between the Karate IE @ 0.025 lbs Al/acre and Karate IE @ 0.0125 lbs Al/acre + Cutlass WP treatments. When compared with untreated plots, all treatments except Ammo 2.5 EC, Thiodan 3EC and Larvin 80DF @ 0.8 lbs Al/acre significantly reduced seasonal numbers of thrips while all treatments significantly reduced HB populations. All treatments significantly reduced damage compared with the untreated control. Heads harvested from Brigade 10WP and Karate IE plots were rated as free from damage. Heads harvested from plots treated with Ammo 2.5 EC, Fury 1.5 EC @ 0.038 lbs Al/acre, Larvin 80DF @ 0.8 lbs Al/acre and 1.0 lbs Al/acre had very little damage and were all classified as marketable. No phytotoxicity was observed with any of the treatments. Mean no. cabbage looper larvae per five plants Rate Ml 26 May 28 May 2 . un 7 Jun 0 Jun 16 Jun 22 Jun 29 Jun Treatment acre pretreat 2 DAT 7 DAT 3 DAT 6 DAT 2 DAT 8 DAT 5 DAT Brigade 10 WP 0.08 18.75 ± 6.10 a 0.50 ± 0.50 b 0.00 ± 0.00 b 1.00 ± 0.58 b 1.50 ± 0.96 ab 0.75 ± 0.48 a 0.00 ± 0.00 b 0.00 ± 0.00 b Ammo 2.5 EC 0.08 21.50 ± 8.25 a 1.50 ± 0.65 b 2.50 ± 0.87 ab 3.00 ± 1.08 b 0.00 ± 0.00 b 4.25 ± 3.59 a 2.75 ± 1.11 b 0.75 ± 0.48 b Fury 1.5 EC 0.038 23.75 ± 9.53 a 6.00 ± 1.78 b 3.50 ± 2.87 ab 2.25 ± 1.65 b 0.25 ± 0.25 b 10.25 ± 6.01 a 5.50 ± 3.88 ab 2.25 ± 0.48 ab Fury 1.5 EC 0.05 24.25 ± 9.91 a 3.00 ± 0.91 b 2.00 ± 1.41 ab 2.75 ± 1.60 b 0.50 ± 0.50 b 3.00 ± 1.91 a 2.75 ± 1.38 b 0.50 ± 0.50 b Pounce 3.2 EC 0.20 20.00 ± 6.99 a 1.25 ± 0.48 b 1.75 ± 1.11 ab 3.50 ± 0.96 b 1.75 ± 0.85 ab 4.25 ± 1.84 a 2.50 ± 0.65 b 0.25 ± 0.25 b Thiodan 3EC 1.0 20.00 ± 7.49 a 3.75 ± 1.75 b 3.50 ± 2.87 ab 4.25 ± 1.75 b 1.25 ± 1.25 ab 1.75 ± 1.75 a 3.75 ± 1.31 ab 1.25 ± 0.75 b Karate IE 0.025 21.75 ± 4.09 a 1.25 ± 0.75 b 2.75 ± 1.89 ab 0.75 ± 0.25 b 0.25 ± 0.25 b 2.75 ± 1.60 a 2.75 ± 1.18b 0.00 ± 0.00 b Larvin 80DF 0.6 18.00 ± 4.88 a 1.75 ± 1.11 b 3.50 ± 0.96 ab 6.25 ± 1.97 b 3.00 ± 1.22 ab 4.00 ± 2.48 a 7.00 ± 1.58 ab 4.00 ± 1.78 ab Larvin 80DF 0.8 22.50 ± 6.50 a 4.00 ± 1.68 b 5.75 ± 1.80 ab 2.25 ± 1.11 b 1.75 ± 1.44 ab 7.75 ± 3.82 a 5.75 ± 2.53 ab 3.25 ± 14 9 ab Larvin 80DF 1.0 18.25 ± 4.80 a 3.25 ± 0.85 b 2.50 ± 1.19 ab 1.75 ± 1.03 b 1.00 ± 0.71 ab 3.50 ± 2.22 a 5.25 ± 1.93 ab 3.25 ± 1.97 ab Karate IE + 0.0125 ± 10.93 a 0.75 ± 0.48 b 3.00 ± 1.41 ab ± 1.03 b ± 0.25 b 2.00 ± ± 0.65 b 0.50 ± 26.75 2.25 0.25 1.08 a 2.50 0.29 b Cutlass WP 0.5 Untreated 18.50 ± 6.96 a 11.25 ± 2.95 a 7.50 ± 3.30 a 12.00 ± 2.20 a 4.25 ± 1.03 a 9.00 ± 3.08 a 11.75 ± 4.33 a 6.25 ± 1.65 a Means ( ± SE) within a column followed by the same letter are not significantly different, SAS (REGWQ P < 0.10). Seasonal means per five plants Rate Treatment lb Al/acre CL eggs CL larvae Thrips Harlequin bugs Brigade 10 WP 0.08 6.59 2.32 a 2.81 ± 1.28 b 0.05b 0.19 0.13 b 0.09 Ammo 2.5 EC 0.08 4.59 1.26 a 4.53 ± 1.55 b 0.52 ab 0.13 0.06 b 0.97 Fury 1.5 EC 0.038 4.56 1.13a 6.72 ± 1.87 ab 0.23 b 0.38 0.20 b 0.41 Fury 1.5 EC 0.05 5.09 1.23 a 4.84 ± 1.76 b 0.25 0.13 b 0.25 0.13 b Pounce 3.2 EC 0.20 6.84 1.84 a 4.41 ± 1.36 b 0.72 0.33 b 0.16 0.11 b Thiodan 3EC 1.0 4.72 1.14a 4.94 ± 1.42 b 1.25 0.62 ab 0.09 0.07 b Karate IE 0.025 6.56 1.36 a 4.03 ± 1.34 b 0.59 0.32 b 0.09 0.07 b Larvin 80DF 0.6 3.94 1.21 a 5.94 ± 1.13b 0.81 0.48 b 0.03 0.03 b Larvin 80DF 4.44 0.94 a 1.48 ab 0.59 ab 0.38 0.29 b 0.8 6.63 ± 1.28 Larvin 80DF 3.91 0.78 a 1.16b 0.23 b 0.25 0.22 b 1.0 4.84 ± 0.50 Karate IE + 0.0125 7.31 1.76 a 4.75 ± 1.94 b 0.53 0.27 b 0.03 ± 0.03 b Cutlass WP 0.5 Untreated 4.94 1.46 a 10.06 ± 1.35 a 4.50 3.08 a 2.09 ± 0.81 a Means (± SE) within a column followed by the same letter are not significantly different, SAS (REGWQ, P < 0.10). Downloaded from https://academic.oup.com/amt/article-abstract/19/1/68/4639250 by DeepDyve user on 02 August 2020 E: VEGETABLE CROPS Arthropod Management Tests, Vol. 19 69 Rate % Marketable Weight per Insect damage Treatment lb Al/acre heads head (Kg) rating Brigade 10WP 0.08 100.0 0.0 a 0.49 0.09 a 1.00 0.00 c ± ± Ammo 2.5 EC 0.08 100.0 ± 0.0 a 0.45 0.08 a 1.04 ± 0.03 c Fury 1.5 EC 0.038 100.0 ± 0.0 a 0.44 0.05 a 1.07 ± 0.05 c Fury 1.5 EC + 0.05 97.1 ± 2.9 a 0.46 0.04 a 1.10 ± 0.05 c Pounce 3.2 EC + 0.20 86.5 8.7 a 0.51 0.03 a 1.30 0.18 c ± ± Thiodan 3EC 1.0 78.4 ± 8.8 a 0.50 ± 0.00 a 1.66 ± 0.18 b Karate IE 0.025 100.0 ± 0.0 a 0.47 ± 0.02 a 1.00 ± 0.00 c Larvin 80DF 0. 6 89.6 ± 9.5 a 0.40 ± 0.07 a 1.28 ± 0.17 c Larvin 80DF 0. 8 100.0 0.0 a 0.45 0.06 a 1.03 0.02 c ± ± ± Larvin 80DF 1.0 100.0 ± 0.0 a 0.41 ± 0.07 a 1.10 ± 0.10 c Karate IE + 0.0125 98.7 ± 1.3a 0.47 0.03 a 1.04 ± 0.03 c Cutlass WP 0.5 Untreated 0. 0 ± 0.0 b 0.32 0.01 a 3.99 ± 0.01 a Means (± SE) within a column followed by the same letter are not significantly different, SAS (REGWQ, P = 0.10). CABBAGE: Brassica oleracea L. 'Blue Vantage' S. Rowland and B. Cartwright (19E) Cabbage looper (CL): Trichoplusia ni (Htibner) Department of Entomology Diamondback moth (DBM): Plutella xylostella (L.) Oklahoma State University P.O. Box 128 Lane, OK 74555 CONTROL OF CABBAGE LOOPER AND DIAMONDBACK MOTH ON CABBAGE, SPRING, 1993: Six week old cabbage plants were transplanted into a Bernow series sandy loam soil on 29 Mar at the Wes Watkins AREC Lane, OK. Plots one row wide by 4.6 m long were arranged in a randomized complete block design with four replications. One unplanted row between rows and 3 m within rows served as spray buffers. Double- row beds were spaced 0.9 m apart with 30 cm between plants within rows. Standard cultural practices were used throughout the trial. All treatments were applied on 4, 14, 19 and 25 May and 2, 10 Jun using a C0 -powered backpack sprayer calibrated on 3 May @ 205.2 liters per acre. The sprayer was equipped with two TX-26 (hollow cone) spray nozzles spaced 46 cm apart and directed inward towards the base of the plants. On each sample date, five randomly selected plants per plot were sampled for CL, DBM and other lepidopterous larvae. Larvae were categorized as small (CL: instar 1 or 2; DBM—instar 1, 2 or 3) or large (CL—instar 3 or 4; DBM—instar 4, 5 or 6). All heads were harvested on 2 Jul and evaluated for insect feeding damage according to the following scale: 1 = no wrapper leaf damage, no head damage, 2 = wrapper leaf damage, no head damage, 3 = light head damage (3 or less feeding holes), 4 = moderate/severe head damage (>3 feeding holes). Heads rated 1 or 2 were considered marketable in accordance with USDA market standards. CL populations were high with populations increasing to 7.75 larvae per plant in untreated plots on 24 May. DBM populations were lower with the peak of 1.25 larvae per plant in untreated plots observed on 18 May. The seasonal mean number of CL eggs was significantly lower in plots treated with Condor OF. Slightly lower levels of CL (small and large) larvae were observed in the Condor OF treatment throughout the season. Efficacy of ECX 9371 AF and ECX 9348 AF for reducing numbers of large CL appeared to be affected by rate. Compared with untreated plots, all treatments significantly reduced the season mean number of DBM. A rate effect can also be seen for the seasonal mean number of DBM between Cutlass WP, with numbers of larvae decreasing with increasing rates. A significant reduction of the overall lepidopterous population was seen on 24 May and in the seasonal mean for Condor OF plots when compared with the untreated check. However, rate effects of Cutlass WP, ECX 9371 AF and ECX 9348 AF are not apparent when all lepidopterous species are combined. All treatments had significantly higher percentages of marketable heads and lower damage ratings when compared with untreated plots. Improved efficacy with increasing rates was observed with Cutlass WP and ECX 9371 AF as measured by damage ratings. No phytotoxicity was observed with any of the treatments. CL eggs per five plants 24 May Rate/ 3 May 7 May 12 May 18 May 1 Jun 8 Jun Seasonal Treatment 3 DAT 4 DAT 5 DAT 6 DAT mean acre pre trea t 8 DAT 7 DAT Cutlass WP 1.0 1b 15.50 ± 7.49 a 25.25 ± 8.50 a 17.25 ± 7.09 a 11.50 ± 1.85 be 3.00 ± 1.22 a 2.50 ± 0.96 a 1.50 ± 0.87 ab 10.93 ± 2.35 ab 10.14 ± Cutlass WP 1.5 lbs 10.50 ± 3.50 a 23.75 ± 3.33 a 8.50 ± 3.52 a 14.75 ± 4.64 be 6.75 ± 2.78 a 3.75 ± 2.06 a 3.00 ± 1.41 ab 1.67 ab ECX 9371 AF 1.0 qt 13.50 ± 3.28 a 32.00 ± 12.22 a 9.50 ± 3.93 a 30.75 ± 7.73 ab 3.75 + 2.46 a 1.50 ± 0.96 a 4.00 ± 1.58 ab 12.89 ± 2.83 ab ECX 9371 AF 2.0 qts 11.75 ± 3.71 a 20.25 ± 5.95 a 13.25 ± 6.41 a 36.25 ± 4.25 a 3.00 ± 1.08 a 0.50 ± 0.29 a 2.00 ± 1.41 ab 12.43 ± 2.63 ab ECX 9371 AF 3.0 qts 18.00 ± 2.16 a 22.25 ± 5.84 a 15.00 ± 5.12 a 29.00 ± 9.38 ab 4.75 ± 1.89 a 5.50 ± 2.25 a 3.75 ± 2.39 ab 14.04 ± 2.38 a ECX 9348 AF 1.0 qt 11.75 ± 1.80 a 24.75 ± 2.53 a 7.50 ± 2.87 a 13.75 ± 1.93 be 5.00 ± 2.86 a 2.25 ± 1.60 a 5.00 ± 2.12 ab 10.00 ± 1.56 ab ECX 9348 AF 2.0 qts 12.50 ± 2.63 a 26.75 ± 5.28 a 13.25 ± 3.97 a 22.00 ± 3.85 abc 3.50 ± 2.25 a 2.50 ± 1.19 a 8.00 ± 4.10 a 12.64 ± 2.01 ab ECX 9348 AF 3.0 qts 13.75 ± 4.87 a 21.75 ± 2.95 a 11.00 ± 4.43 a 21.50 ± 5.42 abc 7.75 ± 6.42 a 2.50 ± 2.50 a 3.00 ± 1.29 ab 11.61 ± 2.02 ab Condor OF 1.0 qt 13.00 ± 3.65 a 16.75 ± 5.72 a 8.00 ± 5.90 a 7.00 ± 2.48 be 1.50 ± 0.87 a 0.50 ± 0.50 a 0.25 ± 0.25 b 6.71 ± 1.65 b Javelin WG 1.0 1b 9.50 ± 3.93 a 37.75 ± 8.05 a 20.50 ± 8.80 a 20.00 ± 3.03 abc 3.00 ± 2.04 a 3.50 ± 1.55 a 1.25 ± 0.25 ab 13.64 ± 2.89 a Untreated 11.75 ± 2.46 a 19.75 ± 10.55 a 17.75 ± 1.03 abc 2.75 ± 1.03 a 1.75 ± 0.85 a 1.75 ± 0.63 ab 9.57 ± 2.04 ab — 11.50 ± 5.06 a Means ( ± SE) within a column followed by the same letter are not significantly different, SAS (REGWQ, P £ 0.10).

Journal

Arthropod Management TestsOxford University Press

Published: Jan 1, 1994

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