[Syrphidae] yellow trays

[Booij, C.J.H.]

Can anyone familiar with syrphid sampling in field crops tell me whether it
makes any difference to use trays/pans which are yellow all over or
trays/pans of which only the inside bottom is painted yellow ? We imagine
that it can make quite a difference in trapping efficiency.

Kees Booij (ecological entomologist)

Plant Research International
P.O. Box 16
NL-6700 AA Wageningen 
The Netherlands

tel. +31 317 476261,  fax. +31 317 423110
e-mail:   c.j.h.booij@plant.wag-ur.nl
internet: http://www.plant.wageningen-ur.nl