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AGRICULTURAE
CONSPECTUS SCIENTIFICUS
Volume 65, No 2, 2000 (89-97)
ORIGINAL SCIENTIFIC
PAPER
Investigation of the Insecticide Seed Dressing on the Sugar Beet
Jasminka IGRC BARCIC 1
Renata DOBRINCIC 1
Vesna SAREC 2
Andrija KRISTEK 3
SUMMARY
The results of three year trials with various sugar beet seed treatments
on the most important sugar beet pests, wireworms, flea beetles, sugar
beet weevil and aphids are presented. The task of the investigation was
to establish whether or not the sugar beet seed should be treated with
insecticides and when granulars should be applied. In threeyear investigations
6 trials on different localities were carried out. Gaucho 70WS, Montur
190 FS, Geocid ST 35, Carbofuran 500 FS and a combination of Geocid ST
35 and Geocid G-5 were applied. The results showed that the imidacloprid
seed treatment was satisfactory efficient on wireworms ensuring 20-42%
more plants than on untreated plots. The efficacy of all treatments on
the flea beetles was sufficient: Gaucho 70 WS 63-70%, the combined carbofuran
treatment 65-67%, Geocid ST 35 54-55% and Montur 190 FS 52-55%. Therefore
on imidacloprid and carbofuran treated crops the foliar treatment against
flea beetles is mostly unnecassary. Insecticides based on imidacloprid
showed a very good efficacy on aphids until 64 days after the sowing time
with a somewhat longer residual action than the standard carbofuran treatments.
All investigated insecticides were not satisfactorily efficient against
sugar beet weevil. The seed dressing with a systemic insecticide is a
justified measure. But, if the attack of wirevorms is strong or if a positive
sugar beet weevil forecast is present, granulars shoud be applied additionaly.
KEY WORDS
seed dressing insecticides, sugar beet, pests
1 Faculty of Agriculture, University of Zagreb
Svetosimunska cesta 25, 10000 Zagreb, Croatia
2 Sladorana Zupanja, 32270 Zupanja, Croatia
3 Institut za secernu repu, 31000 Osijek, Croatia
Received: February 14, 2000
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