Article Figures & Data
Figures
- Figure 1.
The frequency of problems caused by insects, diseases, or improper culture associated with 20 common genera of landscape plants monitored by 5 IPM programs. Program 1 was conducted at a university campus and the remaining 4 programs were conducted with suburban homeowners.
Tables
- Table 1.
The relative abundance and frequency of problems associated with the 20 most common genera of landscape plants found at an institution in Maryland in 1981. Landscapes were monitored by university scouts.
Plant genus % of total plants % of total problems % of plants in genus with problems Quercus 20.3 39.2 69.7 Ilex 19.6 2.2 4.2 Pinus 9.9 17.4 63.5 Acer 4.9 4.6 34.4 Juniperus 4.4 0.3 2.8 Taxus 3.4 0.0 0.0 Rhododendron 3.3 9.1 63.2 Malus 3.2 7.5 85.4 Prunus 3.1 2.8 32.8 Ligustrum 2.7 0.0 0.0 Pyracantha 1.5 3.7 85.0 Magnolia 1.4 0.0 0.0 Buxus 1.4 1.3 32.7 Viburnum 1.3 0.0 0.0 Salix 1.0 1.8 64.3 Abelia 1.0 0.0 0.0 Forsythia 1.0 0.0 0.0 Cornus 0.9 2.6 100.0 Cedrus 0.8 0.0 0.0 Tsuga 0.7 0.0 0.0 Total 85.8 92.5 - Table 2.
The relative abundance and frequency of problems associated with the 20 most common genera of landscape plants found in 25 homesites in Maryland in 1980. Homesites were monitored by university scouts.
Plant genus % of total plants % of total problems % of plants in genus with problems Rhododendron 17.1 19.8 25.4 Juniperus 12.1 10.4 18.9 Forsythia 7.3 4.1 12.3 Taxus 6.8 0.0 0.0 Euonymus 6.6 3.5 11.5 Ilex 6.2 1.2 4.1 Pyracantha 4.5 5.8 28.6 Acer 4.2 1.2 6.1 Cornus 3.2 5.8 40.0 Pinus 3.1 1.7 12.5 Ligustrum 2.4 1.2 10.5 Picea 2.4 2.3 21.1 Prunus 2.3 7.0 66.7 Quercus 2.3 1.2 11.1 Malus 2.2 4.2 47.1 Thuja 1.5 4.1 5.8 Buxus 1.4 0.0 0.0 Rosa 1.4 3.5 54.5 Tsuga 1.4 1.7 27.3 Fraxinus 1.4 1.2 18.2 Total 89.8 79.9 - Table 3.
The relative abundance and frequency of problems associated with the 20 most common genera of landscape plants found in 150 homesites in Maryland in 1981. Homesites were monitored by university scouts.
Plant genus % of total plants % of total problems % of plants in genus with problems Rhododendron 16.6 23.8 55.2 Juniperus 10.0 10.9 42.0 Ilex 6.2 2.6 16.5 Rosa 5.2 6.2 45.9 Pinus 4.7 6.6 54.4 Taxus 4.2 2.4 21.9 Acer 3.8 1.3 13.2 Euonymus 3.6 6.4 68.1 Ligustrum 3.3 1.2 14.7 Forsythia 2.9 2.0 27.2 Prunus 2.8 2.8 38.7 Thuja 2.6 2.9 43.7 Cornus 2.3 2.7 46.8 Buxus 2.1 2.2 40.3 Malus 2.1 8.6 100.0 Pyracantha 1.6 5.0 100.0 Tsuga 1.2 4.6 15.5 Quercus 1.0 4.6 17.9 Spirea 0.9 0.4 17.9 Picea 0.9 0.4 16.0 Total 78.0 97.6 - Table 4.
The relative abundance and frequency of problems associated with the 20 most common genera of landscape plants found in 100 homesites in Maryland in 1982. Homesites were monitored by university scouts.
Plant genus % of total plants % of total problems % of plants in genus with problems Rhododendron 17.0 17.7 24.8 Cornus 6.9 7.5 25.9 Ilex 5.9 4.2 17.0 Juniperus 5.9 5.0 20.3 Quercus 5.6 1.4 6.1 Pinus 4.6 3.7 18.8 Taxus 4.2 0.1 0.8 Acer 4.2 2.5 14.2 Euonymus 3.8 5.8 36.3 Thuja 3.2 0.9 6.8 Prunus 3.1 6.1 47.5 Picea 2.9 1.9 15.7 Rosa 2.8 4.4 36.7 Forsythia 2.8 1.1 9.0 Malus 2.1 6.3 71.5 Tsuga 2.0 1.4 16.5 Buxus 1.8 3.4 43.5 Ligustrum 1.3 1.3 23.1 Pyracantha 1.1 3.0 66.7 Liriodendron 1.1 0.1 3.2 Total 82.3 77.8 - Table 5.
The relative abundance and frequency of problems associated with the 20 most common genera of landscape plants found in 26 homesites in Maryland in 1982. Homesites were monitored by a commercial arborist
Plant genus % of total plants % of total problems % of plants in genus with problems Rhododendron 22.8 25.0 17.1 Ilex 12.8 3.4 2.1 Buxus 8.8 24.0 42.7 Juniperus 5.6 0.0 2.0 Tsuga 4.7 1.8 6.1 Taxus 3.3 0.1 0.6 Rosa 3.1 8.4 42.4 Pinus 2.7 0.5 2.9 Cornus 2.1 14.2 100.0 Prunus 2.0 4.8 100.0 Euonymus 1.9 1.1 25.1 Viburnum 1.3 0.6 2.6 Quercus 1.2 0.7 9.8 Acer 1.1 0.9 12.2 Thuja 0.9 0.0 1.0 Berberis 0.8 0.0 1.0 Ligustrum 0.7 0.6 12.0 Ligustrum 1.3 1.3 23.1 Hosta 0.7 1.9 39.7 Osmanthus 0.7 0.0 0.0 Pieris 0.5 1.3 41.0 Total 77.8 89.3
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