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RICE WATER WEEVIL CONTROL IN WATER-SEEDED RICE, 2002

RICE WATER WEEVIL CONTROL IN WATER-SEEDED RICE, 2002 (F88) RICE: Oryza sativa L., 'Bengal' Donald R. Johnson University of Arkansas Cooperative Extension Service 2301 S. University Ave. Box 391 Little Rock, AR 72203 Tel: (800) 659-8277, Ext. 2232 Fax: (501) 671-2303 djohnson@uaex.edu Kenneth D. Walsh University of Arkansas Cooperative Extension Service P.O. Box 357 2001 HWY 70 East Lonoke, AR 72086 Tel: (501) 676-3124 Fax: (501) 676-7847 dwalsh@uaex.edu Rice water weevil (RWW): Lissorhoptrus oryzophilus (Kuschel) Various seed and post-emergence treatments were evaluated for the control of the Rice water weevil (RWW) larvae in water-seeded rice at the University of Arkansas Pine Tree Branch Agricultural Research Center located in St. Francis County. Individually levied, plots were 13 ft x 20 ft with 7-inch row spacing. Six treatments were arranged in a RCB with four replications. The study was planted on 23 May with pre- soaked seed at rate of 90 lb dry seed/acre. However, the study was sprayed on 7 Jun with Gramoxone at 1.5 pt/acre due to a poor stand. The study was re-planted at the same rate on 11 Jun with pre-soaked seed. Merit was applied on 28 Jun. The Icon and Cruiser seed-carrier broadcast treatments were applied on 3 Jul. The seed-carrier broadcast treatment consisted of 0.54 lb of dry seed exposed to 248°F for 24 h, after which the seed was soaked for 24 h. The seed was drained, treated with Icon, and sown on the same day. The amount of seed used was calculated as the approximate amount of seed used to plant an individual plot. Each plot was evaluated weekly from 11 Jul through 31 Jul, using two 4-inch-diameter x 3-inch-deep soil cores. The soil cores were washed through a 0.25-inch-mesh followed by a 40-mesh screen sieve, and RWW larvae populations determined. Plots were not harvested due to late planting and slow plant development. Data were processed using Agriculture Research Manager Version 6.0.1. ANOVA was performed and DMRT (P = 0.05) was used to separate means. All treatments gave significant control of the RWW at 8 DAT, but all treatments were statistically similar by 14 DAT. Looking at the seasonal average, only Icon-treated seed had significantly lower counts than the untreated check, making it the best option for control of the RWW in water-seeded rice. However, all treatments were statistically similar to Icon-treated seed and would be viable options. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Arthropod Management Tests Oxford University Press

RICE WATER WEEVIL CONTROL IN WATER-SEEDED RICE, 2002

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Oxford University Press
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© Published by Oxford University Press.
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2155-9856
DOI
10.1093/amt/28.1.F88
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Abstract

(F88) RICE: Oryza sativa L., 'Bengal' Donald R. Johnson University of Arkansas Cooperative Extension Service 2301 S. University Ave. Box 391 Little Rock, AR 72203 Tel: (800) 659-8277, Ext. 2232 Fax: (501) 671-2303 djohnson@uaex.edu Kenneth D. Walsh University of Arkansas Cooperative Extension Service P.O. Box 357 2001 HWY 70 East Lonoke, AR 72086 Tel: (501) 676-3124 Fax: (501) 676-7847 dwalsh@uaex.edu Rice water weevil (RWW): Lissorhoptrus oryzophilus (Kuschel) Various seed and post-emergence treatments were evaluated for the control of the Rice water weevil (RWW) larvae in water-seeded rice at the University of Arkansas Pine Tree Branch Agricultural Research Center located in St. Francis County. Individually levied, plots were 13 ft x 20 ft with 7-inch row spacing. Six treatments were arranged in a RCB with four replications. The study was planted on 23 May with pre- soaked seed at rate of 90 lb dry seed/acre. However, the study was sprayed on 7 Jun with Gramoxone at 1.5 pt/acre due to a poor stand. The study was re-planted at the same rate on 11 Jun with pre-soaked seed. Merit was applied on 28 Jun. The Icon and Cruiser seed-carrier broadcast treatments were applied on 3 Jul. The seed-carrier broadcast treatment consisted of 0.54 lb of dry seed exposed to 248°F for 24 h, after which the seed was soaked for 24 h. The seed was drained, treated with Icon, and sown on the same day. The amount of seed used was calculated as the approximate amount of seed used to plant an individual plot. Each plot was evaluated weekly from 11 Jul through 31 Jul, using two 4-inch-diameter x 3-inch-deep soil cores. The soil cores were washed through a 0.25-inch-mesh followed by a 40-mesh screen sieve, and RWW larvae populations determined. Plots were not harvested due to late planting and slow plant development. Data were processed using Agriculture Research Manager Version 6.0.1. ANOVA was performed and DMRT (P = 0.05) was used to separate means. All treatments gave significant control of the RWW at 8 DAT, but all treatments were statistically similar by 14 DAT. Looking at the seasonal average, only Icon-treated seed had significantly lower counts than the untreated check, making it the best option for control of the RWW in water-seeded rice. However, all treatments were statistically similar to Icon-treated seed and would be viable options.

Journal

Arthropod Management TestsOxford University Press

Published: Jan 1, 2003

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