Effect of spray droplet size, spray volume and fungicide on the control of white mold in soybeans

2017 ◽  
Vol 92 ◽  
pp. 190-197 ◽  
Author(s):  
Ayrton Berger-Neto ◽  
David de Souza Jaccoud-Filho ◽  
Carlos Rafael Wutzki ◽  
Hamilton Edemundo Tullio ◽  
Marcelo Luiz Cunha Pierre ◽  
...  
Keyword(s):  
Droplet Size ◽  
White Mold ◽  
Spray Droplet ◽  
Spray Volume

Spray Deposition of Clopyralid on Honey Mesquite (Prosopis glandulosa)

1991 ◽  
Vol 5 (3) ◽  
pp. 499-503 ◽  
Author(s):  
Rodney W. Bovey ◽  
Raymond A. Stermer ◽  
Louis F. Bouse
Keyword(s):  
Gas Chromatography ◽  
Droplet Size ◽  
Laboratory Experiments ◽  
Spray Deposition ◽  
Prosopis Glandulosa ◽  
Spray Droplet ◽  
Spray Solution ◽  
Spray Volume ◽  
Spray Deposit ◽  
Honey Mesquite

Greenhouse and laboratory experiments were conducted to evaluate the influence of clopyralid formulation, spray droplet size, and spray volume on deposit of clopyralid on greenhouse-grown honey mesquite. The addition of surfactant WK at 0.5% (v/v) of the spray solution caused a twofold increase in deposition of spray of the monoethanolamine salt (MEA) of clopyralid but not the oleylamine salt (OLA). There were no differences in spray deposit between spray droplet size spectrums of 160 or 330 μm Dv.5or spray solution applications of 47 or 187 L ha-1. Dye and gas chromatography measurements of spray deposit of clopyralid compared favorably except where surfactant WK was used with the OLA formulation.

scholarly journals Factors influencing broadcast-herbicide control of huisache (Vachellia farnesiana)

2019 ◽  
Vol 33 (6) ◽  
pp. 773-777
Author(s):  
Megan K. Clayton ◽  
Robert K. Lyons
Keyword(s):  
Soil Moisture ◽  
Droplet Size ◽  
Treatment Plant ◽  
South Texas ◽  
Plant Mortality ◽  
Herbicide Application ◽  
Spray Droplet ◽  
Cumulative Rainfall ◽  
Spray Volume ◽  
Average Plant

AbstractHuisache is a major brush problem on native rangelands and pastures in South Texas. Although herbicide applications to foliage provide very high plant-kill levels, the same herbicides have not proven reliable when applied as broadcast ground or aerial foliar treatments. Aerial and ground broadcast herbicide foliar treatments were applied to 31 huisache sites. Soil temperature and soil moisture were measured at a depth of 30 cm at the time of herbicide application. Cumulative rainfall before herbicide application was recorded. Across all aerial treatments, plant mortality was 69% for plants shorter than 2 m versus 40% for plants taller than 2 m. Across all aerial- and ground-treated sites, plants shorter than 2 m had an average 89% mortality when cumulative 2-wk rainfall was at least 50 mm, versus 72% mortality with cumulative rainfall less than 50 mm. Average plant mortality was 84% when 4-wk cumulative rainfall was at least 76 mm, versus 71% with rainfall less than 76 mm; and 85% when, on a dry-to-wet scale of 0 to 10, soil moisture measured at least 8, versus 71% when soil moisture measured less than 8. In a separate aerial trial, plant-mortality effects of spray droplet size (417, 630, and 800 µm) and spray volume (37.4 L ha−1 and 93.5 L ha−1) were replicated and tested at a single study site in 2014. Plant mortality was lowest for the 93.5 L ha−1 and 800 µm treatment. Plant mortality rates for other treatments were similar, demonstrating a greater importance of droplet size than spray volume. Targeting huisache trees shorter than 2 m, when cumulative rainfall has reached at least 50 mm or at least 76 mm 2 or 4 wk before application, respectively, as well as maintaining spray droplet sizes no larger than 630 µm can increase herbicide efficacy with foliar broadcast applications.

Effect of Two Polysaccharide Adjuvants on Glyphosate Spray Droplet Size and Efficacy

2007 ◽  
Vol 21 (1) ◽  
pp. 171-174 ◽  
Author(s):  
Elizabeth J. Jones ◽  
James E. Hanks ◽  
Gene D. Wills ◽  
Robert E. Mack
Keyword(s):  
Droplet Size ◽  
Potassium Salt ◽  
Field Studies ◽  
Spray Droplet ◽  
Spray Droplets ◽  
Spray Volume ◽  
Salt Formulation ◽  
Drift Control

Laboratory and field studies were conducted to determine the effect of the drift control adjuvants HM 2005B and HM 9752 on the droplet spectra and efficacy of spray mixtures of a potassium salt formulation of glyphosate. Droplet spectra were examined using a laser spray droplet analyzer. The addition of each adjuvant decreased the percentage of the spray volume in small diam spray droplets (<141μm) and either had no effect or increased glyphosate efficacy. These adjuvants could prove useful for providing management in potential drift situations.

SPRAY DROPLET DISTRIBUTION AND HERBICIDE UPTAKE IN SEQUENTIAL APPLICATIONS OF DICLOFOP-METHYL AND MCPA FOR WEED CONTROL IN BARLEY

1979 ◽  
Vol 59 (1) ◽  
pp. 93-98 ◽  
Author(s):  
F. A. QURESHI ◽  
W. H. VANDEN BORN
Keyword(s):  
Acetic Acid ◽  
Leaf Surface ◽  
Avena Fatua ◽  
Wild Oat ◽  
Spray Application ◽  
Spray Droplet ◽  
Wild Oats ◽  
Droplet Distribution ◽  
Spray Droplets ◽  
Spray Volume

Uptake of 14C-diclofop-methyl {methyl 2-[4-(2,4-dichlorophenoxy)phenoxy propanoate]} by leaves of wild oats (Avena fatua L.) was reduced significantly in the presence of MCPA {[(4-chloro-o-tolyl)oxy]acetic acid]}, especially the dimethylamine formulation. If the herbicides were applied separately, the degree of interference with uptake depended on the extent of overlap of droplets of the two spray preparations on the leaf surface. Spray volume and direction of spray application were important factors in minimizing the mixing of spray droplets on the leaves if the two herbicides were applied separately with a tandem arrangement of two sprayers. Such a sequential application of MCPA ester and diclofop-methyl in a field experiment provided significantly greater wild oat control than could be obtained with a tank mix of the same two herbicides, but the results were not consistent enough to recommend the procedure for practical use.

Spray Droplet Size Distributions Delivered by Air Blast Orchard Sprayers

1977 ◽  
Vol 20 (2) ◽  
pp. 0232-0237 ◽  
Author(s):  
D. L. Reichard ◽  
H. J. Retzer ◽  
L. A. Liljedahl ◽  
F. R. Hall
Keyword(s):  
Droplet Size ◽  
Size Distributions ◽  
Spray Droplet ◽  
Air Blast ◽  
Droplet Size Distributions
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