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San Jose scale and other scale pests - resistance of shelter trees |
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Many orchards are affected by more than one scale insect species. It is essential to find out which scale species is most important in your orchard before selecting shelter trees. The resistance of the following shelter trees to the following scale insects has been investigated:
| Scale pest | Resistant shelter | Susceptible shelter | |
| San Jose scale | Willows |
Salix matsudana x alba
‘Aokautere’ 1002 S. fragilis |
S. matsudana 227 S. matsudana x alba ‘Adair’ 1143 S. matsudana x alba ‘Moutere’ 1184 S. matsudana x alba ‘Tangoio’ 1040 |
| Poplars | Populus deltoides x nigra ‘Flevo’ | ||
| Alders | Alnus glutinosa | A. rhombifolia A. rubra |
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| Sheoke (non-host) |
Casuarina
cunninghamiana C. glauca |
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| Oystershell scale | Willows |
Salix purpurea S.matsudana x alba ‘Tangoio’ 1040 S. matsudana x alba ‘Moutere’ 1184 |
S. acutifolia S. discolor 'B' PN215 S. fragilis S. glaucophylloides x viminalis S. glaucophylloides x acutifolia S. incana x discolor PN1244 S. matsudana x alba 'Adair' 1143 S. matsudana x alba ‘Aokautere’ 1002 S. viminalis gigantea |
| Poplars | Populus nigra italica (lombardy) Populus nigra italica (golden lombardy) P. nigra 76-238 |
P. deltoides x nigra
‘Tasman’ 559 P. deltoides x nigra ‘Flevo’ PN462 P. deltoides x nigra I-154 PN140 |
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| Birches | Betula costata? B. jaquemonti (grafted) B. platyphylla japonica B. platyphylla schechuanica? |
B. albo sinensis B. fetizonii B. papyrifera neoalaskana B. papyrifera subcordata B. pendula B. pendula tristis B. platyphylla B. populifolia B. pubescens B. utilis |
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| Alders | Alnus cordata A. glutinosa A. jorullensis |
A. incana A. inokumae A. rubra |