.

Assembly of nets

During assembly and closing of nets following must be kept in mind:

1. Meshes need to be fixed and must not be shiftable

Netz_erweiterte Maschen_HeidrunVogtNetz_erweiterte Maschen_HeidrunVogt_Ausschnitt
Unsuitable net - The mesh of net have to be glued or welded so that the mesh could not be relocated
(© H. Vogt, JKI Dossenheim)
Netz mit unregelmäßig verschweißten Maschen_copyright B. Boehnke_JKI DossenheimNahaufnahme: Netz mit unregelmäßig verschweißten Maschen_copyright B. Boehnke_JKI Dossenheim
It needs to be checked that the mesh of the net is welded uniformly (© B. Boehnke, JKI Dossenheim)

2. The net needs to be closed timely (prior to the start of changing color of fruits / prior to june fruit drop)

Männliche Kirschessigfliege auf reifender Himbeere_copyright by Felix BriemDas Roeteln bzw. der Junifall der Kirsche _copyright by Heidrun Vogt
Color changing of raspberries
(© F. Briem, JKI Dossenheim)
June fruit drop of cherries
(© H. Vogt, JKI Dossenheim)

3. All open areas have to be closed with nets

Offene Stellen Netz_A_HeidrunVogtEinzunetzende seitliche offene Bereiche am Himbeertunnel_copyright by BiancaBoehnke, JKI Dossenheim
Open areas between the foil canopy have to be closed by net (© H. Vogt, JKI Dossenheim)Lateral ventilation has to be netted
(© B. Boehnke, JKI Dossenheim)

4. The nets have to be closed at ground level

Nicht ausreichender Bodenabschluss_copyright by B. Dinkhoff, LWK NRWBodenbefestigung C A B_copyright by Adrian Engel_LWK NRW
Insufficient closing to the ground level
(© B. Dinkhoff, LWK NRW)
Attachment on the floor by buried net, floor anchoring or placing sandbags on netting
(© B. Dinkhoff, LWK NRW)

5. The net must not chafe on construction of foiltunnel / foil canopy (ropes, clamps, posts, linkage). To protect the net, such areas have to be covered with i.e. rubber hose

Schaden 7_copyright by S. Ditzer, LWK NRWMögliche Scheuerstellen an Pfosten müssen zum Schutz des Netzes z.B. mit abgerundetem Kunststoff überzogen werden_copyright B. Boehnke_JKI Dossenheim
Damage to net by chafe marks
(© S. Benz, LWK NRW)
Possible chafe marks on posts have to be covered with i.e. rounded plastic to protect the net
(© B. Boehnke, JKI Dossenheim)
Seile der Konstuktion sollten zum Schutz des Netzes mit z.B. runden Plastikrohren bedeckt werden_Bild 1_copyright B. Boehnke_JKI DossenheimSeile der Konstuktion sollten zum Schutz des Netzes mit z.B. runden Plastikrohren bedeckt werden_Bild 2_copyright B. Boehnke_JKI Dossenheim

Ropes of the construction have to be covered with i.e. plastic tubes to protect the net
(© B. Boehnke, JKI Dossenheim)

6. The nets must not be held too taut in order that the net don´t rupture during strong wind

Zu straff gespannte Netze führen zu hoher Windanfälligkeit_copyright B. Dinkhoff, LWK NRWNetz mit ausreichend Bewegungsspielraum_Copyright S. Nitsch, LWK NRW
Tightly streched nets lead to high wind susceptibility
(© B. Dinkhoff, LWK NRW)
Nets with sufficient scope for movement - movement of nets has to be possible (© S. Nitsch, LWK NRW)

7. The net must not have contact to the fruits

Direkt an Netz anliegende Kirschen_copyright Heidrun Vogt, JKI DossenheimHohe Gefahr der Eiablage der Kirschessigfliege durch das Netz in die am Netz anliegenden Kirschen_copyright Peter Burger, JKI Dossenheim
Directly to the net adjoining cherries
(© H. Vogt, JKI Dossenheim)
Great danger of oviposition of Spotted Wing Drosophila through the net into the adjoining cherries
(© P. Burger, JKI Dossenheim)
Direkt am Netz anliegende Kirschen mit zusätzlichem Fraß weiterer Insekten_copyright B. Boehnke, JKI Dossenheim
Directly to the net adjoining cherries with additional damage by further insects (© B. Boehnke, JKI Dossenheim)

8. Regularly checking of nets for damage

Schaden 4_copyright by S. Ditzer, LWK NRWSchaden 6_copyright by S. Ditzer, LWK NRW
Schaden 5_copyright by S. Ditzer, LWK NRWSchaden 1_copyright by S. Ditzer, LWK NRW
All damages of net have to be repaired
(© S. Benz, LWK NRW)

 9. Regulary checking of the net on the ground level to damages by volunteer plants

Net damages by volunteer plants on the ground level 1Net damages by volunteer plants on the ground level 2
To avoid damages of the net by volunteer plants, the attachment of net on the ground level have to be inspect regularly and strongly growing weeds have to removed (© C. Fetzer, LLH Hessen)

 

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