Spray Volume and Frequency Impacts on Insecticide Efficacy Against the Citrus Mealybug (Hemiptera: Pseudococcidae) on Coleus under Greenhouse Conditions

2021 ◽  
Vol 56 (3) ◽  
Author(s):  
Devin L. Radosevich ◽  
Raymond A. Cloyd
Keyword(s):  
Citrus Mealybug ◽  
Insecticide Efficacy ◽  
Spray Volume

scholarly journals Evaluation of the Fermentation Byproduct Spinosad and Conventional Insecticide Treatments for Controlling Sunflower Beetle Larvae, 1996

1997 ◽  
Vol 22 (1) ◽  
pp. 324-324
Author(s):  
M. A. Boetel ◽  
B. W. Fuller ◽  
R. J. Braun
Keyword(s):  
South Dakota ◽  
Linear Models ◽  
Test Area ◽  
Individual Treatment ◽  
North Central ◽  
General Linear Models ◽  
Insecticide Efficacy ◽  
Whole Plant ◽  
Spray Volume ◽  
Central South

Abstract A commercial sunflower field near Mina, in north-central South Dakota, was selected foi our trial of several insecticide treatments at standard and reduced rates for management of SB larvae. The experiment was arranged in a RCBD with 4 replications, and individual treatment plots were 25 ft long by 10 rows (38 inch spacing) wide. In addition, each plot was bordered by two buffer rows to prevent drift. Pre-application evaluations were carried out using whole-plant visual counts of the number of live SB larvae per plant. Twenty plants were examined from each treatment plot and these counts indicated an average of 11 SB larvae per plant within the test area. Treatments were applied on 11 Ju’ using a CO2-propelled backpack sprayer system with a hand-held 6.7-ft long boom. The boom was equipped with 4 TeeJet 8001 nozzles spaced 20 inches apart, and was calibrated to deliver a spray volume of 15 gpa while traveling at 3 mph. Insecticide efficacy was evaluated at 6 DAT using the same count ing technique and number of samples described for pre-application sampling. Data were analyzed with SAS’ s General Linear Models procedure and means were compared using DMRT.

scholarly journals Effects of Spray Volume and Application Frequency on Insecticide Efficacy Against Adult Western Flower Thrips (Frankliniella Occidentalis) under Greenhouse Conditions

HortScience ◽  
2020 ◽  
Vol 55 (10) ◽  
pp. 1708-1714
Author(s):  
Devin L. Radosevich ◽  
Raymond A. Cloyd ◽  
Nathan J. Herrick
Keyword(s):  
Frankliniella Occidentalis ◽  
Insect Pest ◽  
Western Flower Thrips ◽  
Economic Losses ◽  
Horticultural Crops ◽  
Flower Thrips ◽  
Insecticide Efficacy ◽  
Percent Mortality ◽  
Application Frequency ◽  
Spray Volume

The western flower thrips, Frankliniella occidentalis (Pergande) (Thysanoptera: Thripidae), is a major insect pest of greenhouse-grown horticultural crops. Western flower thrips causes direct and indirect damage by feeding on plant leaves, flowers, and fruits, and by transmitting viruses that can result in greenhouse producers experiencing substantial economic losses. Consequently, insecticides are used to suppress western flower thrips populations. However, issues associated with applying insecticides may affect the suppression of western flower thrips populations. Therefore, experiments were conducted under greenhouse conditions to determine the effects of the spray volume applied and application frequency on insecticide efficacy against western flower thrips adults located in transvaal daisy, Gerbera jamesonii, cut flowers. Four spray volumes (5.0, 10.0, 12.5, and 25.0 mL), two application frequencies (one or two spray applications), and three insecticides [spinosad (Conserve), chlorfenapyr (Pylon), and flonicamid (Aria)], each with a different mode of action, were tested. The insecticide treatments had the greatest effects on the mean percent mortality of western flower thrips adults regardless of spray volume or application frequency. However, in Expt. 3, the 5.0- and 10.0-mL spray volumes resulted in a higher mean percent mortality of western flower thrips adults than the 2.5-mL spray volume. Spinosad and chlorfenapyr resulted in a mean percent mortality of more than 72% for western flower thrips adults, whereas flonicamid resulted in mean percent mortality between 40% and 91%. Our study demonstrates that certain insecticides are more effective against western flower thrips adults located in transvaal daisy flowers than others, which will help greenhouse producers effectively manage western flower thrips populations.

scholarly journals CITRICOLA SCALE INSECTICIDE EFFICACY TRIAL, 2002

2004 ◽  
Vol 29 (1) ◽  
Author(s):  
Elizabeth E. Grafton-Cardwell ◽  
Christopher A. Reagan
Keyword(s):  
Efficacy Trial ◽  
Insecticide Efficacy

scholarly journals Insecticide Efficacy Against Corn Earworm in Sweet Corn, 2019

2020 ◽  
Vol 45 (1) ◽  
Author(s):  
David Owens ◽  
Joseph Deidesheimer ◽  
Cody Stubbs
Keyword(s):  
Sweet Corn ◽  
Corn Earworm ◽  
Insecticide Efficacy

Measurement of foliar spray retention on creeping bentgrass

2019 ◽  
Vol 33 (6) ◽  
pp. 827-832
Author(s):  
Pingyuan Zhang ◽  
Bruce E. Branham
Keyword(s):  
Nonionic Surfactants ◽  
Foliar Spray ◽  
Creeping Bentgrass ◽  
Seed Oils ◽  
Retention Efficiency ◽  
Food Dye ◽  
Spray Volume ◽  
The Impact ◽  
Application Volume ◽  
Foliar Retention

AbstractExperiments were conducted to evaluate the impact of spray volume, nozzle type, adjuvants, the presence of dew, and their interactions on foliar retention of creeping bentgrass. Tartrazine, a common food dye, was used as a tracer in this study. Increasing spray volume from 95 L ha−1 to 1,500 L ha−1 decreased foliar retention efficiency from 98% to approximately 85%. Compared with flat-fan nozzles, air-induction nozzles delivered similar retention efficiency at all spray volumes evaluated. However, flat-fan nozzles provided higher uniformity and more thorough coverage. Adding nonionic surfactants, organosilicone adjuvants, or methylated seed oils at typical concentrations yielded retention efficiency of approximately 90% to 93% regardless of spray volumes. In contrast, with water alone, increasing spray volume reduced retention efficiency from 95.9% to 87.3%. Simulated dew applied at 1,950 L ha−1 increased retention efficiency by approximately 3% when spray application volume was 190 L ha−1, while no difference was observed at 750 L ha−1. The presence of dew reduced the impact of adjuvants on retention efficiency. Large quantities of dew, 3,800 L ha−1, did reduce retention efficiency.

scholarly journals Greenhouse Evaluation of Insecticides for Control of Yellow Sugarcane Aphid and Greenbug on Sorghum Seedlings, 1994

1995 ◽  
Vol 20 (1) ◽  
pp. 230-230
Author(s):  
R. M. Anderson ◽  
G. L. Teetes
Keyword(s):  
Grain Sorghum ◽  
Hollow Cone ◽  
Soil Mixture ◽  
Insecticide Application ◽  
Sugarcane Aphid ◽  
Greenhouse Evaluation ◽  
Seedling Plant ◽  
Plant Emergence ◽  
Spray Volume ◽  
Pre Treatment

Abstract Foliar treatments of 2 organophosphates and imidachloprid (Confidor) were evaluated for yellow sugarcane aphid (YSA) and greenbug (GB) control in a research greenhouse at Texas A&M University. Hybrid grain sorghum seedlings (ATx399 × RTx430) were grown in 110-mm germination pots containing a prepared soil mixture composed of peat, vermiculite, and periite in a 2:1:1 ratio, respectively. Four days after plant emergence and 3 d prior to insecticide applications, each seedling plant was infested with 10-20 YSA or GB. There were 5 singleseedling replications for each treatment. Insecticides were applied by using a CO2-pressurized backpack sprayer, through TX-3 hollow-cone nozzles at 35 psi, producing a finished spray volume of 5.6 gpa. Pre-treatment counts of YSA and GB were made the day of insecticide application; post-treatment counts of aphids were made 1, 2, and 3 DAT. Percent control was calculated by using Abbott’s (1925) formula. Data were statistically analyzed by using ANOVA and LSD.

Fuel Spray Trajectory in Diesel Engines

1978 ◽  
Vol 100 (2) ◽  
pp. 326-332 ◽  
Author(s):  
M. M. Elkotb ◽  
N. M. Rafat
Keyword(s):  
Heat Transfer ◽  
Theoretical Model ◽  
Working Conditions ◽  
Fuel Spray ◽  
Air Velocity ◽  
Spray Penetration ◽  
Injection Angle ◽  
Velocity Pattern ◽  
Spray Volume ◽  
Spray Velocity

A detailed investigation of the effect of the shape of an open combustion chamber for diesel engine on the air velocity pattern, and consequently, on the trajectory of the fuel spray is given in this paper. A theoretical model for the calculation of the spray penetration, taking into consideration the heat transfer to the droplet, the variation of the drag force with Reynolds number, and air velocity pattern, is suggested. The effect of some working conditions on the spray shape, trajectory, and penetration is experimentally studied to verify the theoretical model and to correlate the results of using different medium pressures, initial spray velocity, and injection angle on the magnitude of fuel spray diameter and spray volume.

scholarly journals Insecticide Efficacy Against Aphids in Cauliflower, 2014

2015 ◽  
Vol 40 (1) ◽  
pp. E23
Author(s):  
Eric T. Natwick ◽  
Martin I. Lopez ◽  
Rafael Lara ◽  
Adam Anderholt
Keyword(s):  
Insecticide Efficacy
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