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Assessment of risk of by-stander contamination during the application of pesticides to field arable crops in typical UK conditions. - PS2006

Measurements will be made of the potential pesticide contamination that could be suffered by adults and children in an area downwind of a pesticide application. The work will use the following sampling approaches:

(i) measurements on horizontal surfaces at ground level in a 2.0 m wide strip immediately adjacent to the treated area - this to give an estimate of direct and indirect contamination that could occur - e.g. to children playing in a garden area next to a treated field with the ground or short vegetation contaminated by drift;

(ii) at distances of 2.0 and 8.0 m downwind of the edge of a treated area, measurements of:

(a) the contamination of clothing on mannikins representing both adults and children;
(b) airborne spray volumes using suction samplers and fine sampling lines;

so as to obtain estimates of the potential contamination of adults and children by direct contamination, inhalation or secondary contamination by contact with other surfaces in the downwind area.

Measurements of airborne spray will also be made above the crop, 5.0 m downwind of the treated area and to a height of 10.0 m, 8.0 m downwind to give an estimate of airborne spray that may travel further distances away from a treated area.

A total of three applictions will be made in weather conditions, particularly wind speeds, that are likely to give levels of drift at the high end of those used in commercial practice. Two applications will be made using a sprayer configuration that is likely to give high drift and involve the use of a high boom height, fine spray with relatively small droplets and delivery at an angle to the vertical. A third application will use a nozzle system specifically designed to reducing drift by creating a large droplet size bit with air included in the droplets to aid retention on target surfaces.

All applications will use a commercial fungicide simulation with deposits on collection targets analysed by appropriate chemical techniques. Results from the field trial will be interpreted to aid the definition of drift risk procedures.
1.The planning and design of a field experiment to obtain data relating to the risk of by-stander contamination and agreeing this with The Pesticides Safety Directorate;

2.Conducting the field experiment and obtaining the contaminated collectors for analysis;

3.Analysing the deposits on the collection surfaces and reference surfaces used during the experiment;

4.Interpreting the results obtained;

5.Reporting the findings to Defra and The Pesticides Safety Directorate.

Project Documents
• Final Report : Assessment of risk of by-stander contamination during the application of pesticides to field arable crops in typical UK conditions.   (649k)
Time-Scale and Cost
From: 2005

To: 2005

Cost: £32,826
Contractor / Funded Organisations
Silsoe Research Institute (BBSRC)
Pest and Weed Control              
Pesticide use              
Plants and Animals              
Fields of Study
Pesticide Safety