1. Control of larvae of the western corn rootworm /WCR/ (Diabrotica virgifera virgifera LeConte, 1868) József, TAKÁCS –Miklós, NÁDASY – Péter, BALOGH University of Veszprém, Georgikon Faculty of Agriculture, Institute of Plant Protection, Department of Agricultural Entomology

2. Portorož, 2005 feb. 28. - march. 05.2 Female adult

3. Portorož, 2005 feb. 28. - march. 05.3 Damages on leaves and tassels

4. Portorož, 2005 feb. 28. - march. 05.4 Damages on silk and ears

5. Portorož, 2005 feb. 28. - march. 05.5 Larvae of WCR

6. Portorož, 2005 feb. 28. - march. 05.6 Root damage and plant lodging

7. Portorož, 2005 feb. 28. - march. 05.7 Life cycle of WCR

8. Portorož, 2005 feb. 28. - march. 05.8 Biology of the pest Diabrotica Overwinter in egg state (about 8 to 10 months in soil) Prolonged hatching of eggs (longer than a month) Three larval instars (Root damages under a two month period) Oviposition from July to October

9. Portorož, 2005 feb. 28. - march. 05.9 Continuous hatching of eggs Problems of soil insecticides: High doses, risk of soil pollution Expensive Period of effectiveness Problems of seed coating: Period of effectiveness (less than a month) Need longer effectiveness period No need soil pollution Problems of WCR

10. Portorož, 2005 feb. 28. - march. 05.10 MAVICELL pearl Microporous build Able to bind over triple dose of insecticide agents Prolonged transmittance of the agents even under two months 100 % cellulose Disorganize under three months in soil

11. Portorož, 2005 feb. 28. - march. 05.11 Porous body of MAVICELL pearl Large absorptive surface to bind chemical and biological agents

12. Portorož, 2005 feb. 28. - march. 05.12 Test object: Tanymecus dilaticollis GILLENHAL Greenhouse screening Mortality: Over 95 % even after the 60 th day.

13. Portorož, 2005 feb. 28. - march. 05.13 Seeding machines: - Kuhn Planter Junior - Monosem NG Pus - JohnDeere Maxemerge Plough land applications

14. Portorož, 2005 feb. 28. - march. 05.14 Problems of sowers Monosem: Its micro-granule adaptor not able to sow the large pearls (necessary to change the adaptor for sowing micro-granules) JohnDeere: Its not able to sow the complete dose of the pearl (only half dose)

15. Portorož, 2005 feb. 28. - march. 05.15 Observations and data processing Inspection of regularity of sowing Estimation of the number of early stage pests (Corn Weevils – Tanymecus dilaticollis GILLENHAL) Measuring of larval damages with IOWA or Oleson-Tollefson scales Estimation of lodging after growth of ears Statistical analysis

16. Portorož, 2005 feb. 28. - march. 05.16 Results of MAVICELL and differences between treatments Average damages in: Control: IOWA value 5 Soil treatment (Furadan): IOWA value 4 MAVICELL treatments: Under economical threshold (IOWA value 3,5)

17. Portorož, 2005 feb. 28. - march. 05.17 TreatmentAverage*SdMultiple comparison** Gaucho 0.26 [M]3,140,92a Talstar [M]3,441,01a Furadan K.3,960,71b Mospilan [M]4,111,00b Absz. K.4,511,05c *: IOWA values, n=80 **: No significance between data marked with the same character on α = 0,5 (Data processed with SPSS for Windows 9.0) Statistical analysis of damaging on roots after washing

18. Portorož, 2005 feb. 28. - march. 05.18 Results After three years of investigation we can say: MAVICELL is able to protect maize against WCR! Are there any losses of quality of pearl or agents? Checking with greenhouse screening! Costs of a hectare are much cheaper than the same with soil insecticides! We need to find a reliable method or seeding-machine to sow the pearls under the rows of corn!!!

19. Portorož, 2005 feb. 28. - march. 05.19