Prof. Dr. em. Frans Jacobs - Phytofar
Prof. Dr. em. Frans Jacobs - Phytofar
Prof. Dr. em. Frans Jacobs - Phytofar
SHOW LESS
You also want an ePaper? Increase the reach of your titles
YUMPU automatically turns print PDFs into web optimized ePapers that Google loves.
Honingbijen<br />
Verdwijnziekte en bijensterfte in Europa:<br />
Voor 1985: 5% wintersterfte<br />
Na 1985: 10% wintersterfte<br />
Na 1996: > 20% wintersterfte
Change language