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Insecticidal Control of Fall Armyworm in Florida Sweet Corn, 1992

Insecticidal Control of Fall Armyworm in Florida Sweet Corn, 1992 Downloaded from https://academic.oup.com/amt/article-abstract/19/1/97/4639283 by DeepDyve user on 02 August 2020 E: VEGETABLE CROPS Arthropod Management Tests, Vol. 19 97 'Alpi ne' 'Sil ver Queen' No. No. Mean no. worms/ marketable marketable 10 ears Mean no. worms/15 ears ears/15 ears/10 Treatment Rate/acre ears CEW FAW ECB ears CEW FAW Condor OF 2.00 qt 10.00b 3.50a 1.25ab 0.25b 5.33bc 6.33ab 3.00a TD 2321 0.90 lb AI 14.25a 0.75a 0.00b 0.25b 9.00ab 1.33ab 0.33a Karate IE 0.02 lb AI 14.75a 0.00a 0.00b 0.00b 10.00a 0.00b 0.00a Larvin 3.2F 0.75 lb AI 12.75ab 1.25a 1.25ab 0.00b 7.66ab 3.33ab 1.00a Asana XL 0.04 lb AI 7.66ab 0.00b 3.33a — — — — Untreated check 3.00c 4.00a 5.75a 4.50a 2.66c 7.33a 4.66a Means in a column with a letter in common are not significantly different (P = 0.05, Ryan's Q Test). CORN (SWEET): Zea mays L. 'Florida Staysweet' P. A. Stansly and B. M. Cawley (5 IE) Fall armyworm (FAW); Spodoptera frugiperda (J. E. Smith) University of Florida—IFAS SW Florida Research & Education Center P.O. Drawer 5127 Immokalee, FL 33934 INSECTICIDAL CONTROL OF FALL ARMYWORM IN FLORIDA SWEET CORN, 1992: Six raised beds on 6 ft centers prepared on 17 Aug included a fertilizer bottom mix of 1000 lbs/acre of 5-16-8 and 800 lbs/acre of 19-0-19 placed in a central band at bedding. Beds were fumigated with 220 lbs/acre of methyl bromide injected every 5 inches across the bed width and sealed immediately with white-faced, black polyethylene. On 5 Oct, two seeds per hole of the cultivar 'Florida Staysweet' were planted in two rows 10 inches apart in the center of each bed and later thinned to one plant per space. Manzate 200 was applied weekly with a plot sprayer at 100 psi to prevent leaf blight and rust. Each of two sets of 3, 240 ft rows was divided into two blocks, 50 ft long, with 100 row ft between blocks. Each row was randomly assigned one of 2 treatments or a control water-treatment in a RCB design. Spray applications were made weekly over 8 weeks beginning 30 Oct using a C0 pressurized backpack sprayer manufactured by Weed Systems, Inc., Gainesville FL. At an operating pressure of 40 psi, the first 5 applications were calibrated at a rate of 30 gpa and the last 3 at 45 gpa. The surfactant, APSA-80 (80% Alkyl Aryl Alkoxylate) was added at the rate of 0.3% to the Larvin application. Armyworm counts and damage ratings were made one day prior to the first treatment and weekly thereafter by examining the whorl and the next 2 adjacent leaves before tasseling and all ears thereafter. The following numerical ranking system was used for damage ratings: 0: no damage, 1: windowing to 10%, 2: 11-30%, 3: 31-40%, 4: 41-50%, and 5: greater than 50%. Larvae observed during field evaluations were recorded. Plots were harvested on 21 Dec and 7 Jan. All the mature ears were collected and counted and weighed. The number of damaged ears was noted and ears weighed. Numbers of fall armyworm were relatively low throughout most of the trial, possibly due to the late planting date. Significant differences (P < 0.05) in damage ratings and between insecticide treatments and water-sprayed controls occurred on four sample dates. Differences in FAW between the two sprayed treatments were not significant. Differences in number and weight of damaged ears were significant between insecticide treatments and controls. Again, differences between insecticide treatments were not significant. Florida Agricultural Experiment Station Journal Series No. N-00887. Mean over all 16 Nov 23 Nov 30 Nov samples 2 Nov 9 Nov 14 Dec Damage x Damage x Damage No. Damage x Damage x Damage x Damage x Rate/acre (%) FAW (%) FAW (%) FAW (%) FAW (%) FAW (%) FAW TRT (%) FAW Karate 1.61b 0.03a 8.81a 0.00a 0.00a 0.00a 2.94a 0.02b 0.25 lb 5.05b 0.00a 4.50a 0.00a 0.00b 0.00b 5.29a 0.10a 0.77b 0.00a 3.35a 0.13ab Larvin 20 oz 1.76b 0.00a 4.69b 0.55a 6.42a 0.00a 0.65b 0.00a Control n/a 2.16a 0.07a 6.41a 0.36a 13.24a 1.56a 16.10a 0.06a 9.19a 0.25a 12.49a 0.00a 7.69a 0.44a Means followed by the same letter in the same column indicate no significant differences between treatments (Duncan's multiple range P < 0.05). Marketabl e ears Damagec ears Treatment Rate/acre Number Wt. (lbs) Number Wt. (lbs) Karate 0.25 lb 150.25a 96.30a 1.00b 0.38b Larvin 20 oz. 165.75a 105.90a 2.75b 1.62b Control 121.50a 77.65a 14.75a 9.35a http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Arthropod Management Tests Oxford University Press

Insecticidal Control of Fall Armyworm in Florida Sweet Corn, 1992

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

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Publisher
Oxford University Press
Copyright
© 1994, Entomological Society of America
eISSN
2155-9856
DOI
10.1093/amt/19.1.97
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Abstract

Downloaded from https://academic.oup.com/amt/article-abstract/19/1/97/4639283 by DeepDyve user on 02 August 2020 E: VEGETABLE CROPS Arthropod Management Tests, Vol. 19 97 'Alpi ne' 'Sil ver Queen' No. No. Mean no. worms/ marketable marketable 10 ears Mean no. worms/15 ears ears/15 ears/10 Treatment Rate/acre ears CEW FAW ECB ears CEW FAW Condor OF 2.00 qt 10.00b 3.50a 1.25ab 0.25b 5.33bc 6.33ab 3.00a TD 2321 0.90 lb AI 14.25a 0.75a 0.00b 0.25b 9.00ab 1.33ab 0.33a Karate IE 0.02 lb AI 14.75a 0.00a 0.00b 0.00b 10.00a 0.00b 0.00a Larvin 3.2F 0.75 lb AI 12.75ab 1.25a 1.25ab 0.00b 7.66ab 3.33ab 1.00a Asana XL 0.04 lb AI 7.66ab 0.00b 3.33a — — — — Untreated check 3.00c 4.00a 5.75a 4.50a 2.66c 7.33a 4.66a Means in a column with a letter in common are not significantly different (P = 0.05, Ryan's Q Test). CORN (SWEET): Zea mays L. 'Florida Staysweet' P. A. Stansly and B. M. Cawley (5 IE) Fall armyworm (FAW); Spodoptera frugiperda (J. E. Smith) University of Florida—IFAS SW Florida Research & Education Center P.O. Drawer 5127 Immokalee, FL 33934 INSECTICIDAL CONTROL OF FALL ARMYWORM IN FLORIDA SWEET CORN, 1992: Six raised beds on 6 ft centers prepared on 17 Aug included a fertilizer bottom mix of 1000 lbs/acre of 5-16-8 and 800 lbs/acre of 19-0-19 placed in a central band at bedding. Beds were fumigated with 220 lbs/acre of methyl bromide injected every 5 inches across the bed width and sealed immediately with white-faced, black polyethylene. On 5 Oct, two seeds per hole of the cultivar 'Florida Staysweet' were planted in two rows 10 inches apart in the center of each bed and later thinned to one plant per space. Manzate 200 was applied weekly with a plot sprayer at 100 psi to prevent leaf blight and rust. Each of two sets of 3, 240 ft rows was divided into two blocks, 50 ft long, with 100 row ft between blocks. Each row was randomly assigned one of 2 treatments or a control water-treatment in a RCB design. Spray applications were made weekly over 8 weeks beginning 30 Oct using a C0 pressurized backpack sprayer manufactured by Weed Systems, Inc., Gainesville FL. At an operating pressure of 40 psi, the first 5 applications were calibrated at a rate of 30 gpa and the last 3 at 45 gpa. The surfactant, APSA-80 (80% Alkyl Aryl Alkoxylate) was added at the rate of 0.3% to the Larvin application. Armyworm counts and damage ratings were made one day prior to the first treatment and weekly thereafter by examining the whorl and the next 2 adjacent leaves before tasseling and all ears thereafter. The following numerical ranking system was used for damage ratings: 0: no damage, 1: windowing to 10%, 2: 11-30%, 3: 31-40%, 4: 41-50%, and 5: greater than 50%. Larvae observed during field evaluations were recorded. Plots were harvested on 21 Dec and 7 Jan. All the mature ears were collected and counted and weighed. The number of damaged ears was noted and ears weighed. Numbers of fall armyworm were relatively low throughout most of the trial, possibly due to the late planting date. Significant differences (P < 0.05) in damage ratings and between insecticide treatments and water-sprayed controls occurred on four sample dates. Differences in FAW between the two sprayed treatments were not significant. Differences in number and weight of damaged ears were significant between insecticide treatments and controls. Again, differences between insecticide treatments were not significant. Florida Agricultural Experiment Station Journal Series No. N-00887. Mean over all 16 Nov 23 Nov 30 Nov samples 2 Nov 9 Nov 14 Dec Damage x Damage x Damage No. Damage x Damage x Damage x Damage x Rate/acre (%) FAW (%) FAW (%) FAW (%) FAW (%) FAW (%) FAW TRT (%) FAW Karate 1.61b 0.03a 8.81a 0.00a 0.00a 0.00a 2.94a 0.02b 0.25 lb 5.05b 0.00a 4.50a 0.00a 0.00b 0.00b 5.29a 0.10a 0.77b 0.00a 3.35a 0.13ab Larvin 20 oz 1.76b 0.00a 4.69b 0.55a 6.42a 0.00a 0.65b 0.00a Control n/a 2.16a 0.07a 6.41a 0.36a 13.24a 1.56a 16.10a 0.06a 9.19a 0.25a 12.49a 0.00a 7.69a 0.44a Means followed by the same letter in the same column indicate no significant differences between treatments (Duncan's multiple range P < 0.05). Marketabl e ears Damagec ears Treatment Rate/acre Number Wt. (lbs) Number Wt. (lbs) Karate 0.25 lb 150.25a 96.30a 1.00b 0.38b Larvin 20 oz. 165.75a 105.90a 2.75b 1.62b Control 121.50a 77.65a 14.75a 9.35a

Journal

Arthropod Management TestsOxford University Press

Published: Jan 1, 1994

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