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Title: FOLIAR INTERCEPTION AND RETENTION VALUES AFTER PESTICIDE APPLICATION: A PROPOSAL FOR STANDARDIZED VALUES FOR ENVIRONMENTAL RISK ASSESSMENT

Author
item LINDERS, J - RIVN (DUTCH EPA)
item MENSINK, H - BBA (GERMAN EPA)
item STEPHENSON, G - UNIV OF GUELPH
item Wauchope, Robert - Don
item RACKE, K - DOW-ELANCO

Submitted to: Journal of Pure and Applied Chemistry
Publication Type: Peer Reviewed Journal
Publication Acceptance Date: 9/20/2000
Publication Date: 1/20/2000
Citation: LINDERS, J., MENSINK, H., STEPHENSON, G., WAUCHOPE, R.D., RACKE, K. FOLIAR INTERCEPTION AND RETENTION VALUES AFTER PESTICIDE APPLICATION: A PROPOSAL FOR STANDARDIZED VALUES FOR ENVIRONMENTAL RISK ASSESSMENT. PURE AND APPLIED CHEMISTRY. 72:2199-2218. 2000.

Interpretive Summary: When pesticides are applied to crop, part of the spray lands on the crop plants and part on the ground. Although this will obviously have a big effect on the pesticides subsequent fate (for instance, deposits on foliage are usually degraded much faster than deposits on soil, and deposits on the soil are easily washed off the field or into the soil making them potential lpollutants), the relative amounts of pesticide falling on crop and soil ar not well known and field experiments to measure this are difficult. This paper reviews the research in this area and makes some recommendations for rough-estimate "foliar interception fraction" values for various crops, which can be used by regulators in doing risk assessments for pesticides.

Technical Abstract: In performing risk assessments for plant protection products by applicants or regulators in relation to the registration of the products, an important aspect to take into account is the foliar interception and retention of the active substance of the product on the plant. An overview is given of the approaches to this item in several parts of the world. The relevant circumstances and influencing variables, like growth phase, planting density, and some physico-chemical characteristics, e.g. vapour pressure and Henry's coefficient are dealt with. Finally, a proposal is presented for how to take into account the phenomenon of foliar interception and retention in the initial phase, first tier, of the risk assessment process.