Biological effectiveness of electrostatically charged rotary atomisers.

Arnold, A. J.; Cayley, G. R.; Dunne, Y.; Etheridge, P.; Griffiths, D. C.; Phillips, F. T.; Pye, B. J.; Scott, G. C.; Vojvodic, P. R.

doi:10.1111/j.1744-7348.1984.tb03059.x

Cited by 21 publications

(8 citation statements)

References 7 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The prospect offered by electrostatic atomizers of more complete protection of much of the plant surface with lower rates of fungicide merits further work with other diseases, fungicides and times of application to exploit fully the potential for disease control in rape. The general biological effectiveness of electrostatically charged rotary atomizers used on rape and other broad-leaved arable crops is discussed fully elsewhere (Arnold et al 1985).…”

Section: Control Of Light Leaf Spot On Rape 625mentioning

confidence: 99%

Fungicide effects on light leaf spot, canker, crop growth and yield of winter oil-seed rape

1984

Self Cite

View full text Add to dashboard Cite

Field experiments with rape ovs Primor, Jet Neuf and Norli during 1979-83 tested the effects of benomyl, prochloraz, imazalil, thiabendazole, metalaxyl or triadimefon sprays applied at different times on disease, crop growth and yield. The principal disease in all experiments was light leaf spot (Pyrenopeziza brassicae).A single spray in autumn of benomyl or prochloraz at 0-5 kg a.i./ha consistently decreased incidence and severity of light leaf spot and sometimes decreased stem canker (Leptosphaeria macvlans). Under severe disease conditions in cv. Primor an autumn spray of fungicide contributed more to disease control than a spray in spring; a decrease in light leaf spot incidence was detectable up to 8 months after application. The autumn spray maintained plant population density, increased leaf area index, dry matter, crop growth rate, earliness of flowering, and yield by up to 0-69 t/ha; an autumn + spring spray increased yield by up to 0-83 t/ha. Effects on crop growth and yield were due to disease control not direct chemical stimulation of growth. Measurements of crop growth and population per unit area revealed the effects of fungicides more clearly than traditional disease assessments based solely on randomly selected plants.Triadimefon sprayed on rape stubble at high dose rate (1 kg a.i./ha) decreased incidence and severity of light leaf spot throughout the growing season of a subsequent rape crop, with beneficial effects on plant population density, growth, flowering and yield.Electrostatically charged rotary atomizer and conventional hydraulic spray applications of fungicide were equally effective in disease control. A reduction to one quarter in dose rate of prochloraz and 100-fold reduction in amount of water carrier (125 g a.i. in 4'3 1/ha) when applied electrostatically in autumn or autumn -I-spring had similar effects on disease, crop growth and yield to those obtained with a conventional sprayer delivering 500 g a.i. prochloraz in 410 1/ha. Fungicides, spray timing and methods of application are discussed in relation to the epidemiology of light leaf spot and canker and the economics of disease control.

show abstract

Section: Control Of Light Leaf Spot On Rape 625mentioning

confidence: 99%

Fungicide effects on light leaf spot, canker, crop growth and yield of winter oil-seed rape

1984

Self Cite

View full text Add to dashboard Cite

show abstract

“…The hydraulic applications were made using a compression sprayer (Airflow Ltd) fitted with a pressure-regulating valve at a rate of 1.000 l/ha. Electrostatic applications were made using the APE-80 rotary atomiser (Institute of Arable Crops Research --Rothamsted) (Arnold & Pye, 1980) operating at 10 l/ha with a flow rate of I1 ml per min. First applications were made on 12 March 1987 (week I); these and all subsequent applications were made in late afternoon, usually within the 90 min period before blackout.…”

Section: Methodsmentioning

confidence: 99%

Application ofVerticillium lecanii for the control ofAphis gossypii by a low-volume electrostatic rotary atomiser and a high-volume hydraulic sprayer

Sopp¹,

Gillespie²,

Palmer³

1989

Entomophaga

View full text Add to dashboard Cite

Verticillium lecanii (Fungi: Deuteromycete) blastospores were applied to a chrysanthemum crop by an ULV electrostatically charged rotary atomiser . The deposition of spores and subsequent control of Aphis gossypii were compared to high volume hydraulic application. A full rate treatment (2 x 10 ~3 blastospores per ha.) was applied by the APE-80 at week 1 and reduced spore rates of 1/6 tli and 1/12 th applied by both the APE-80 and the hydraulic sprayer once and twice a week respertively for weeks 1 to 6. Untreated plots served as controls.Initial deposits of spores were higher with the electrostatic sprayer and better distributed with respect to the position of the target aphids. Significantly lower aphid populations were recorded on the electrostatically treated plots in week 4. The single full rate treatment had significantly fewer aphids than the untreated plots from week 3 and all treatments had significantly fewer aphids than the untreated plots from week 5 onwards. The proportion of the aphid population killed by V. lecanii was higher on the electrostatically treated plots until week 6. KEY-WORDS : Verticillium lecanii, Aphis gossypff, chrysanthemum, electrostatic & hydraulic sprayers.The deuteromycete fungus, Verticillium lecanii (Zimm.) Viegas is a common pathogen of aphids and whitefly in temperate glasshouses where occasionally natural epizootics reduce pest populations. One isolate of V. lecanii (1-72) was developed commercially for aphid control following the studies of Hall & Burges (1979). This product, Vertalec | provided excellent control of Myzus persicae (Sulz.) on chrysanthemums when applied according to the manufacturer's recommendation ; at 2.5 kg (ca. 5 x 1012 spores) in 500-1,000 1 of water per ha 2 weeks after planting. However, control of the cotton aphid, Aphis gossypii (Glover) was often unsatisfactory and consequently Vertalec | was not widely used. In the laboratory, A. gossypii and M. persicae are equally susceptible to V. lecanii with LC50 values of ca. 105 per ml after 6 days at 20 *C and 100 % relative humidity (Hall, 1976). However, the 2 aphids show behavioural differences ; M. persicae is very active while A. gossypii is more sedentary. Hall & Papierok (1982) identified lack of pest mobility as a factor limiting the usefulness of Verticillium lecanii, since control depends on contact with the spores. It is thought that the higher mobility of M. persicae results in contact with fungal spores either on diseased insects or possibly growing saprophytically on nutrients contained in the commercial formulation. The limited movement of A. gossypii means that they are much less likely to encounter V. lecanii spores and become infected.To improve control of A. gossypii, Wardlow suggested repeated low dose spore application and this method has met with some success (Helyer & Wardlow, 1987). A

show abstract

“…In ionized field (corona) charging , an intense voltage (∼70 kV) is applied to a needle tip, producing an electric potential that creates ions in the surrounding air (Arnold et al . ). If a stream of liquid passes near the corona tip, it will pick up ions and become charged.…”

Section: Introductionmentioning

confidence: 97%

Electrostatic Spraying of Potassium Sorbate for the Reduction of Yeast and Molds on Cakes

Kerr

2015

Journal of Food Processing and Preservation

View full text Add to dashboard Cite

Electrostatic spraying (ES) was tested as a means of improving shelf life of cupcakes. A 5% potassium sorbate solution was sprayed, with and without electrostatic charging, onto yellow cupcakes for 1-3 s. Image analyses showed that electrostatic charging increased the uniformity of coverage, with 62-78% area coverage with charging and 36-41% without. Samples were also held at 25C and either 75 or 85% relative humidity (RH). At 75% RH, visible mold appeared after 10 days for control and after 11 days for cakes sprayed with sorbate. At 85% RH, fungal growth appeared after 3 days for control, 4 days for cakes with sorbate spray and 5 days for those with ES sorbate. In all cases, ES delayed the onset of mold and subsequent growth as compared with uncharged sprays. ES also provided a small decrease in the rate of firmness development during storage. PRACTICAL APPLICATIONSSubstantial quantities of breads, cakes and other baked goods suffer a loss of quality or must be discarded because of contamination by yeast and molds. While some ingredient and processing technologies exist to extend the shelf life of baked goods, there is much room for improvement. This research examines the use of electrostatic charging to improve adhesion and coverage of antimicrobial sprays. The results indicate that electrostatic charging of potassium sorbate solutions improves overall surface coverage, slows the onset of microbial growth and limits subsequent growth compared with conventionally applied sprays.

show abstract

Biological effectiveness of electrostatically charged rotary atomisers.

Cited by 21 publications

References 7 publications

Fungicide effects on light leaf spot, canker, crop growth and yield of winter oil-seed rape

Fungicide effects on light leaf spot, canker, crop growth and yield of winter oil-seed rape

Application ofVerticillium lecanii for the control ofAphis gossypii by a low-volume electrostatic rotary atomiser and a high-volume hydraulic sprayer

Electrostatic Spraying of Potassium Sorbate for the Reduction of Yeast and Molds on Cakes

Contact Info

Product

Resources

About