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Foliar dislodging techniques

Half-life estimates of approximately 28 days for thiophanate-methyl indicate a very slow decay compared to methiocarb with an estimate of half-life of about 11 days. The application of a model based on a first-order decay process resulted in fairly high R2 and significant fit. The results suggest that both pesticides are relatively stable compared to other compounds under similar environmental conditions (Brouwer et al., 1994). With respect to the objectives of the study and the proposed model, it can be stated that the results confirm the assumption of a linear relationship between application rate (for both application techniques) and the increase of dislodgeable foliar residue. This relationship holds for modeling purposes. The contribution of the crop density or total crop surface area to the process of interception cannot be quantified with the results of the present study. Because the interception factor ranges from about 0.35 to 0.9 (Willis and McDowell, 1987), the... [Pg.135]

Haan de, M., Brouwer, D.H., and van Hemmen, J.J. (1996) Re-entry Exposure Estimates Application Technique, Foliar Surface and Re-entry Time as Critical Predictors for Dislodgeable Foliar Residue, Report V96.384, TNO Nutrition and Food Research Institute, Zeist, The Netherlands. [Pg.137]

Washing, wiping and vacuum techniques have also been employed to estimate foliar residue dislodgeability from turf grass (Popendorf et al 1975 Goh et al, 1986 Sears et al., 1987 Cowell et al., 1993 Black and Fenske, 1996). In one of these techniques, boots wrapped with cotton cheesecloth are used to determine the transfer of turf residues to the shoe soles (Sears et al., 1987). Another was somewhat similar to the PUF roller, employing the use of a PUF-covered paint roller (Cowell et al., 1993). [Pg.95]

Black, K.G. and R.A. Fenske (1996). Dislodgeability of chlorpyrifos and fluorescent tracer residues on turf Comparison of wipe and foliar wash sampling techniques. Arch. Environ. Contam. Toxicol, 31, 563-570. [Pg.118]

Cowell, J.E., S.A. Adams, J.L. Kunstman and M.G. Mueth (1993). Comparison of foliar and turf dislodgeable residue sampling techniques, in Pesticides in Urban Environments, K.D. Racke and A.R. Leslie (Eds), ACS Symposium Series 522, American Chemical Society, Washington, DC, USA, pp. 100-112. [Pg.119]

Dislodgeable foliar residues from strawberry plants were obtained by collecting 48 circular leaf punches on a random basis, starting with the first day post-application of carbaryl, finishing on the last day of the study (Day-17 post-application). A description of the mechanical leaf punch and the collection technique may be found elsewhere (jj. [Pg.125]


See other pages where Foliar dislodging techniques is mentioned: [Pg.140]    [Pg.140]    [Pg.139]    [Pg.175]    [Pg.176]    [Pg.128]    [Pg.137]   
See also in sourсe #XX -- [ Pg.140 , Pg.141 , Pg.142 , Pg.147 , Pg.148 ]




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