Get 20M+ Full-Text Papers For Less Than $1.50/day. Start a 14-Day Trial for You or Your Team.

Learn More →

EVALUATION OF SEED APPLIED INSECTICIDES FOR CONTROL OF INSECTS ON COWPEA, 2006

EVALUATION OF SEED APPLIED INSECTICIDES FOR CONTROL OF INSECTS ON COWPEA, 2006 (E12) COWPEA: Vigna unguiculata (L.) Walp, ‘Early Scarlet’ Paul McLeod Steve Eaton Larry Martin Department of Entomology University of Arkansas 320 Agriculture Building Fayetteville, Arkansas 72701 Phone: (501) 575-3397 Fax: (501) 575-3348 Email: pjmcleod@uark.edu Tobacco thrips: Frankliniella fusca (Hinds) Flower thrips: Frankliniella tritici (Fitch) Vegetable leafminer: Liriomyza sativae Blanchard The objective of the study was to evaluate the effectiveness of seed applied insecticides for management of thrips and leafminer on cowpea. Plots were located at the University of Arkansas Vegetable Station, Kibler, Arkansas. Soil type is sandy loam. Plots consisted of a single row 25 ft long. Experimental design was RCB with four replications. Treated ‘Early Scarlet’ cowpea seeds were obtained from two sources. The first four treatments (see table) were supplied by Dr. Jack Norton, Cornell University. Seeds for the remaining four treatments were treated with a Gustafson BLT seed applicator (Gustafson Inc., Dallas, TX). Seeds and the insecticide were placed into the treatment drum and rotated and vibrated. After 10 min., seeds were removed and air dried for 24 h on paper toweling. Seeds were hand planted 6 inches apart on 2 Jun 2006. Sampling was initiated on 19 Jun. At sampling, plant height was about 4 inches and plants held 2 true leaves. Within each plot 10 plants were randomly selected and rated from 0 (none) to 5 (extensive) for seedling thrips feeding. Ten cotyledon leaves were also collected from each plot and the number of mines on each leaf was counted. On 13 Jul, 10 mature blooms were randomly selected from each plot, dissected and searched for flower thrips. Plots were harvested on 18 Aug with an Almaco plot harvester (Alma Manufacturing Co., Alma, AR) and seed weight was determined. Data were analyzed with ANOVA and LSD. The number of mines per leaf ranged from 3.8 to 6.8 and all sampled leaves contained mines. No significant differences in mean no. of mines per leaf were detected among the treatments. With the exception of Cruiser (0.092 mg (AI)/seed) and Gaucho (0.115 mg (AI)/seed), all seed treatments significantly decreased seedling damage ratings by tobacco thrips. Although seedling damage was lower in these plots, previous data indicate that seedling damage by thrips rarely decrease cowpea yield. Thus, addition of the seed treatments has little benefit when directed against seedling thrips. It was hoped that the seed treatments would reduce the number of flower thrips which are known to reduce cowpea yield. However, in our study no significant differences in no. of flower thrips per bloom were detected among the seed treatments. Also, no significant yield differences were detected. Rating of Mean no. seedling Mean no. Mean Treatment/ leafmines damage thrips seed wt. (g) formulation mg (AI)/seed per leaf by thrips per bloom per plot Cruiser 5S 0.092 6.8a 3.1a 0.6a 293.5a Gaucho 480 0.115 4.5a 2.4b 0.8a 242.5a Regent 500 0.092 6.8a 1.7cd 0.4a 296.5a Regent 500 0.184 4.8a 1.4de 0.9a 343.5a Cruiser 5S 0.084 5.9a 1.7cd 0.4a 353.5a Cruiser 5S 0.843 3.8a 0.5f 0.6a 285.8a Gaucho 600 0.211 6.6a 1.9c 0.6a 266.8a Gaucho 600 2.112 5.2a 1.2e 1.3a 316.2a Check --- 4.0a 2.6b 0.5a 270.0a Within column means followed by same letter do not differ significantly (LSD; p = 0.05). Ratings ranged from 0 (no damage) to 5 (completely damaged). http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Arthropod Management Tests Oxford University Press

EVALUATION OF SEED APPLIED INSECTICIDES FOR CONTROL OF INSECTS ON COWPEA, 2006

Loading next page...
 
/lp/oxford-university-press/evaluation-of-seed-applied-insecticides-for-control-of-insects-on-PPfDB7kWEx
Publisher
Oxford University Press
Copyright
© Published by Oxford University Press.
eISSN
2155-9856
DOI
10.1093/amt/32.1.E12
Publisher site
See Article on Publisher Site

Abstract

(E12) COWPEA: Vigna unguiculata (L.) Walp, ‘Early Scarlet’ Paul McLeod Steve Eaton Larry Martin Department of Entomology University of Arkansas 320 Agriculture Building Fayetteville, Arkansas 72701 Phone: (501) 575-3397 Fax: (501) 575-3348 Email: pjmcleod@uark.edu Tobacco thrips: Frankliniella fusca (Hinds) Flower thrips: Frankliniella tritici (Fitch) Vegetable leafminer: Liriomyza sativae Blanchard The objective of the study was to evaluate the effectiveness of seed applied insecticides for management of thrips and leafminer on cowpea. Plots were located at the University of Arkansas Vegetable Station, Kibler, Arkansas. Soil type is sandy loam. Plots consisted of a single row 25 ft long. Experimental design was RCB with four replications. Treated ‘Early Scarlet’ cowpea seeds were obtained from two sources. The first four treatments (see table) were supplied by Dr. Jack Norton, Cornell University. Seeds for the remaining four treatments were treated with a Gustafson BLT seed applicator (Gustafson Inc., Dallas, TX). Seeds and the insecticide were placed into the treatment drum and rotated and vibrated. After 10 min., seeds were removed and air dried for 24 h on paper toweling. Seeds were hand planted 6 inches apart on 2 Jun 2006. Sampling was initiated on 19 Jun. At sampling, plant height was about 4 inches and plants held 2 true leaves. Within each plot 10 plants were randomly selected and rated from 0 (none) to 5 (extensive) for seedling thrips feeding. Ten cotyledon leaves were also collected from each plot and the number of mines on each leaf was counted. On 13 Jul, 10 mature blooms were randomly selected from each plot, dissected and searched for flower thrips. Plots were harvested on 18 Aug with an Almaco plot harvester (Alma Manufacturing Co., Alma, AR) and seed weight was determined. Data were analyzed with ANOVA and LSD. The number of mines per leaf ranged from 3.8 to 6.8 and all sampled leaves contained mines. No significant differences in mean no. of mines per leaf were detected among the treatments. With the exception of Cruiser (0.092 mg (AI)/seed) and Gaucho (0.115 mg (AI)/seed), all seed treatments significantly decreased seedling damage ratings by tobacco thrips. Although seedling damage was lower in these plots, previous data indicate that seedling damage by thrips rarely decrease cowpea yield. Thus, addition of the seed treatments has little benefit when directed against seedling thrips. It was hoped that the seed treatments would reduce the number of flower thrips which are known to reduce cowpea yield. However, in our study no significant differences in no. of flower thrips per bloom were detected among the seed treatments. Also, no significant yield differences were detected. Rating of Mean no. seedling Mean no. Mean Treatment/ leafmines damage thrips seed wt. (g) formulation mg (AI)/seed per leaf by thrips per bloom per plot Cruiser 5S 0.092 6.8a 3.1a 0.6a 293.5a Gaucho 480 0.115 4.5a 2.4b 0.8a 242.5a Regent 500 0.092 6.8a 1.7cd 0.4a 296.5a Regent 500 0.184 4.8a 1.4de 0.9a 343.5a Cruiser 5S 0.084 5.9a 1.7cd 0.4a 353.5a Cruiser 5S 0.843 3.8a 0.5f 0.6a 285.8a Gaucho 600 0.211 6.6a 1.9c 0.6a 266.8a Gaucho 600 2.112 5.2a 1.2e 1.3a 316.2a Check --- 4.0a 2.6b 0.5a 270.0a Within column means followed by same letter do not differ significantly (LSD; p = 0.05). Ratings ranged from 0 (no damage) to 5 (completely damaged).

Journal

Arthropod Management TestsOxford University Press

Published: Jan 1, 2007

There are no references for this article.