Drift control and buffer zones for helicopter spraying of bracken (Pteridium aquilinum)

Robinson, R.C.; Parsons, R. G.; Barbe, G.; Patel, Purak; Murphy, S.

doi:10.1016/s0167-8809(00)00127-4

Cited by 16 publications

(9 citation statements)

References 8 publications

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“…Fish and Wildlife 2005) will be more beneficial if there is an adequate buffer zone between the dust source and the plants. Buffer zones have been an effective means of preventing other airborne contaminants such as pesticides that drift onto non-target plants or areas (de Snoo 1999; Robinson et al 2000;Burn 2003) and may help prevent excess dust from drifting onto A. jaeger icnms populations.…”

Section: Discussionmentioning

confidence: 99%

Dust Deposition Effects on Growth and Physiology of the Endangered Astragalus jaegerianus (Fabaceae)

2009

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Human expansion into the Mojave Desert is a significant threat to rare desert plants. While immediate habitat loss is often the greatest concern, rare plants situated near areas where soil surfaces experience frequent disturbance may be indirectly impacted when fine particulate dust accumulates on leaf surfaces. Remaining populations of the federally listed Astragalus jaegcriamis (Lane Mountain milkvetch) occur on land open to expanding military activities and on adjacent public land with increasing recreational use. This study was initiated to determine whether dust accumulation could decrease the vigor and fitness of A. jaegerianus through reduced growth. Beginning in early May 2004, plants located on Bureau of Land Management (BLM) land were dusted bimonthly at canopy-level dust concentrations ranging from 0 to 32 g/m-, and physiology and growth were monitored until late June when plants senesced. The maximum experimental dust level simulates dust concentrations of Mojave Desert perennials neighboring military activities at a nearby army training center. Average shoot growth declined with increasing dust accumulation, but seasonal net photosynthesis increased. Further investigation of plants grown in a greenhouse supported similar trends. This pattern of greater net photosynthesis with increasing dust accumulation may be explained by higher leaf temperatures of dusted individuals. Ambient dust deposition measured in traps near field plants (May 2004--July 2004) ranged from 0.04-0.17 g/m7 d, which was well below the lowest level of dust on experimental plants (3.95 g/m7d). With this low level of ambient deposition, we expect that A. jaegerianus plants in this population were not greatly affected by the dust they receive at the level of recreational use during the study.

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Section: Discussionmentioning

confidence: 99%

Dust Deposition Effects on Growth and Physiology of the Endangered Astragalus jaegerianus (Fabaceae)

2009

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“…The distance between this position and the EOF is the safe distance for the species under experimental conditions. This method was proposed according to the methods used in these studies 26,27 . The safe distance change rate (SDCR) between the 90% cumulative drift distance (CDD) and the soybean safe distance was calculated to represent the difference between the two buffer zone widths.…”

Section: Methodsmentioning

confidence: 99%

Field evaluation of spray drift and nontargeted soybean injury from unmanned aerial spraying system herbicide application under acceptable operation conditions

Huang

Wang

et al. 2022

Pest Management Science

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Background: Droplets of plant production products sprayed from unmanned aerial spraying system (UASS) applications are prone to drift, threatening nontarget crops, humans, and environment. There are few studies that have investigated plant bioassay of UASS spray drift, and even fewer when it comes to herbicide application. This work reports a combined field-scale evaluation of spray drift and plant bioassay for a rice herbicide florpyrauxifen-benzyl application using a six-rotor motor UASS under acceptable operating conditions. An artificial rice canopy was built to simulate a practical field application scenario and the soybean was applied to assess the nontargeted crop injury. The effects of nozzle type (droplet size), flight height, and adjuvant on spray deposition, sedimenting drift, airborne drift, and soybean injury were studied to explore the feasibility of UASS herbicide application.Results: Under an average wind speed of 1.2-1.5 m s −1 , reduced flight height, increased droplet size, and adding nonionic surfactant resulted in greater deposition, lower drift, and less injury to soybean. Increasing droplet size by changing the nozzle was more effective compared with adding adjuvant and reducing the flight height, which offers greater flexibility and can accomplish better spray performance. The correlations between sedimenting drift and soybean injury percentage were highly significant (P < 0.01, r > 0.96). The calculated buffer distances of 7.7-18.9 m were to varying degrees less than the soybean safety distances of 10.0-20.0 m. Conclusion:The results of this study provide a reference basis for determining optimum working parameters and establishing buffer zones for the rice herbicide application of UASS.

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“…The disadvantage is that spray booms often have 30-60 individual nozzles, so cleaning and changing tips is a lengthy task. 'Raindrop' nozzles have been used on helicopters to apply asulam herbicide for bracken control (Robinson et al, 2000) and particulate suspensions for mosquito larviciding. Viscosity additives have been used with sprays to try to reduce the number of small droplets produced.…”

Section: Spray Nozzlesmentioning

confidence: 99%

Aerial application

2014

Pesticide Application Methods

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Drift control and buffer zones for helicopter spraying of bracken (Pteridium aquilinum)

Cited by 16 publications

References 8 publications

Dust Deposition Effects on Growth and Physiology of the Endangered Astragalus jaegerianus (Fabaceae)

Dust Deposition Effects on Growth and Physiology of the Endangered Astragalus jaegerianus (Fabaceae)

Field evaluation of spray drift and nontargeted soybean injury from unmanned aerial spraying system herbicide application under acceptable operation conditions

Aerial application

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