The history of the Top-Stop Nipper in pictures.
The desire to reduce the growth in the length of the leaders has no doubt been present for as long as Christmas trees have been grown commercially. The list below shows which means/methods have been tested where and when:
| Year | Location | Means/Method |
|---|---|---|
| 1985/86 | Rye Nørskov | Cutless |
| 1986-88 | Svenstrup | Cerone, Ethrel, Regufon, Antergon, Bonzi |
| 1988 | HW Låsby | Chemical methods |
| 1992-95 | Tests by a chemicals company requested | |
| 1994 | Strandegård | Importance of bottom pruning |
| 1994 | Clausholm | Chemical methods + removal of needles |
| 1994-95 | Randbøl-Nobilis | Tubes, cutting, light access, light quality |
| 1995 | Strandegård | Bottom pruning, tubes, taking needles off the leader |
| 1995 | Clausholm | Chemical methods, tubes, taking needles off the leader |
| 1996 | Clausholm | Chemical methods, tubes, taking needles off the leader, wounding |
| 1996 | Langesø and Skjoldnæsholm | Tubes, taking needles off the leader, wounding |
| 1996 | Ry / Laven | Wounding, peeling, ringing + cutless |
| 1997 | Esrum, Strandegård, Lindenborg | Tubes, taking needles off the leader, wounding, ringing |
| 1997 | Ry | Top-Stop used at provenience level (Ambro/Turkish fir) |
| 1998 | Ry | Top-Stop related to the time of year |
| 1998 | Langesø | Pilot trial with several different treatments |
| 1999 | 19 locations | Top-Stop different times, treatments, etc. |
| 2000 | Nr. Vilstrup/Rønnede | 20 different treatments (Frans Theilby, FSL) |
| 2000 | Giesegård/Wedellsborg | Cerone, Top-Stop, Moddus, and PC 1 (PC-consult) |
| 2000 | 19 locations in DK, D, UK. | Top-Stop. Different times and treatments |
| 2001 | 20 locations in DK, D, UK. | Top-Stop. Different times and treatments |
| 2002 | 19 locations in DK, N, D, UK, IRL | Top-Stop. Different times and treatments |
| 2003 | 15 locations in DK, D, UK and N. | Top-Stop. Different times and treatments |
| 2004 | 14 locations in DK, D and UK. | Top-Stop. Different times and treatments |
| 2005 | 7 locations in DK and UK.td> | Top-Stop. Different times and treatments |
| 2006 | 5 locations in DK and UK. | Top-Stop. Different times and treatments |
| 2007 | 4 locations in DK and UK. | Top-Stop. Different times and treatments |