Dissipation of aerosols from greenhouse air after application of pesticides using a low-volume technique implications for safe re-entry
article
The application of pesticides using Low-Volume (LV) techniques (volume rate < 50 l/ha) is of growing interest for crop protection in greenhouses. An important LV-technique is the Low Volume Mister (LVM), generating fine droplets (volume mean (aerodynamic) diameter varying from 14 up to 32 μm). Field experiments in a commercial greenhouse have been performed to study the decline in concentration of pesticide residue with time for a non-volatile compound (thiophanate-methyl) and a volatile compound (dichlorvos). In addition, indicative measurements were done on rates of deposition. The results indicate a log-linear decrease of the concentration with time. The non-volatile pesticide tends to dissipate faster than the volatile compound. After a six hours period dichlorvos concentrations still substantially exceeded the TLVT(TM). Control measures, like venting the greenhouse during one hour, are required for safe re-entry.
Topics
TNO Identifier
231891
ISSN
00456535
Source
Chemosphere, 24(9), pp. 1157-1169.
Pages
1157-1169
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