Ede PETRO¹ and Krisztina MUCSI^2
1 Plant Health and Soil Conservation Station, Budapest, Hungary
² Plant Health and Soil Conservation Station of Country Csongrád, Hungary

Any plant protection treatment is successful if it is well suited – in time and space – to the complex of the plant to be protected and the pest to be contained.

Population structure of the WCR beetles was studied at growth stages GS (HANWAY, I.J. 1966): 6-9,2 of maize.

Based on the time scale arrangement of structural patterns, for adjustment of treatments
- in time: population density, sex ratio and reproductive female rate,
- in space: vertical dispersion and movement of beetles
supply the necessary data.

Taking the above approach into consideration, possibilities for reducing populations of WCR beetles by aerial spraying carried out in 1999-2000 in maize stands of different leaf area indices and canopy architecture are presented.

(Made in the frame of the SKK/SooC project)