Development of Drop Size-Frequency Analysis of Sprays Used for Pesticide Application

Akesson, NB; Yates, WE

doi:10.1520/stp18361s

Cited by 4 publications

(2 citation statements)

References 4 publications

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“…This attribute is especially important for the treatment of dense crops with a high LAI (leaf area index). AKESSON and YATES (1986) reported the best droplet size to be between 200 µm and 400 µm. GRINSTEIN et al (1997) examined the influence of droplet density and droplet size on the efficiency of two kinds of fungicides against Botrytis cinerea on roses.…”

Section: Discussionmentioning

confidence: 99%

Influence of droplet spectra on the efficiency of contact fungicides and mixtures of contact and systemic fungicides

Prokop¹,

Veverka²

2006

Plant Prot. Sci.

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The effects of droplet spectra, spray volume, and the addition of an adjuvant to the spray solution against Phytophthora infestans were evaluated using contact fungicides, mixtures of contact and systemic fungicides, and a contact fungicide + an adjuvant. Six droplet spectra, ranging from VMD = 183 µm to VMD = 939 µm, were used. The spray volumes were 300, 450 and 600 l/ha for the contact fungicides, and 300 l/ha was used for the mix of contact with systemic fungicides. No significant differences in efficiency were observed between different droplet spectra when used for the mix of contact with systemic fungicide treatments. However, the efficiency of treatments with a contact fungicide significantly increased with smaller droplet spectra. The larger droplet spectra required larger spray volumes for greater efficiency. The addition of the adjuvant (pinolene, 96%) to the spray solution of the contact fungicide caused the efficiency to be similar for all droplet spectra. The effect of droplet spectra is more pronounced in contact compounds. The translocation of the systemic compounds and the ability of the surfactant to improve the coverage with contact compounds may be the main mechanisms that counteract the effects of larger droplet spectra and lower leaf coverage.

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Section: Discussionmentioning

confidence: 99%

Influence of droplet spectra on the efficiency of contact fungicides and mixtures of contact and systemic fungicides

Prokop¹,

Veverka²

2006

Plant Prot. Sci.

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“…It is generally agreed that the broad range of droplet sizes produced by hydraulic pressure spray nozzles results in an undesirable loss of active chemical during postemergence applications. Some droplets are too large for efficient plant coverage while others are too small for contact with plants (Akesson and Yates, 1986). Gilbert and Bell (1988) found that halving the vmd of a spray resulted in a four-fold increase in drift.…”

Section: Factors Affecting Nozzle Performancementioning

confidence: 99%

Spray deposition and drift during postemergence herbicide applications to turfgrass and annual flowers

Hatterman‐Valenti

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Relationship between the Spray Droplet Density of Two Protectant Fungicides and the Germination ofMycosphaerella fijiensisAscospores on Banana Leaf Surfaces

Washington¹

1997

Pestic. Sci.

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The effect of fungicide spray droplet density (droplet cm‐2), droplet size, and proximity of the spray droplet deposit to fungal spores was investigated with Mycosphaerella fijiensis ascospores on the banana (Musa AAA) leaf surface for two contact fungicides: chlorothalonil and mancozeb. When droplet size was maintained at a volume median diameter (VMD) of 250 μm while total spray volume per hectare changed, M. fijiensis ascospore germination on the leaf surface fell below 1% for both fungicides at a droplet deposit density of 30 droplet cm‐2. At a droplet deposit density of 50 droplet cm‐2, no ascospores germinated in either fungicide treatment. When both droplet size and droplet cm‐2 varied while spray volume was fixed at 20 litre ha‐1, ascospore germination reached 0% at 10 droplet cm‐2 (VMD=602 μm) for both fungicides. At lower droplet densities (2–5 droplet cm‐2 VMD=989 μm and 804 μm respectively), ascospore germination on the mancozeb‐treated leaves was significantly lower than on the chlorothalonil‐treated leaves. The zone of inhibition surrounding a fungicide droplet deposit (VMD=250 μm) on the leaf surface was estimated to extend 1·02 mm beyond the visible edge of the spray droplet deposit for chlorothalonil and 1·29 mm for mancozeb. The efficacy of fungicide spray droplet deposit densities which are lower than currently recommended for low‐volume, aerial applications of protectant fungicides was confirmed in an analysis of leaf samples recovered after commercial applications in a banana plantation. Calibrating agricultural spray aircraft to deliver fungicide spray droplets with a mean droplet deposit density of 30 droplet cm‐2 and a VMD between 300 and 400 μm will probably reduce spray drift, increase deposition efficiency on crop foliage, and enhance disease control compared to aircraft calibrated to spray finer droplets. © 1997 SCI.

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Development of Drop Size-Frequency Analysis of Sprays Used for Pesticide Application

Cited by 4 publications

References 4 publications

Influence of droplet spectra on the efficiency of contact fungicides and mixtures of contact and systemic fungicides

Influence of droplet spectra on the efficiency of contact fungicides and mixtures of contact and systemic fungicides

Spray deposition and drift during postemergence herbicide applications to turfgrass and annual flowers

Relationship between the Spray Droplet Density of Two Protectant Fungicides and the Germination ofMycosphaerella fijiensisAscospores on Banana Leaf Surfaces

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