Vol. 54—2000 - NorthEastern Weed Science Society

Trifolium tricolor 232 26 62 0 18
Sedum reflexum 933 209 178 13 1,036
Hieraceum pilosella 33 4 16 0 0
Lysimachiaciliata p. 68 14 19 0 0
Rumex sanginea 474 106 109 0 6
Total plants available: 25,000 2,500 2,500 25,000 20,000
4 Majority of annual flats had sold priorto weed movement or seed disperal
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Table 4: Categorizing host plant strength as a function ofpot coverage and soil visibility
Category: Criteria: Strength Examples:
Category I: 75-95% I Hemerocallis, Iris, Lupinus, Hosta, Lilium, Delphinium, Eupatorium
Category 2: 50-75% 2 Campanula, Geranium, Euphorbia, Stokesia, Columbine, Helenium, Malva
Category 3: 25-50% 3 Veronica, Salvia, Erica, Calluna, Heuchera, CaImagrostis, Festuca
Category 4: 5-25% 4 Asters, Ground covers, Sedum, Symphytum, Penniseturn, Galium
Category 5a: -5% 5a Monarda, Physostegia, Solidago, Phalaris, Lysarnachia, Vinca, Aguja
Category 5b: -5% 5b Epimedium, Tiarella, Waldensteina, Lamium, Solomon Seal, Chrysagonum
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Table 5: Invasive potential
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of CW as a function of host plant category:
Numbers of plants per strength category infested with crop weeds
Crop Weeds: L a, a, ±.; 5a: Sh:
Ixeris dentata 86 72 48 50 56 32
Viola koreana 72 56 52 56 39 38
Viola labradorica 82 85 60 56 52 48
OxaltsacetosteUa 53 62 49 53 61 49
Trifolium tricolor 28 16 9 II 6 3
Sedum reflexum 90 78 63 66 69 58
Hieraceumpilosella 16 6 3 0 0 0
Lysimachiaciliata p. 28 4 0 0 0 0
Rumex sanginea 66 48 49 39 25 18
Total plants available: 3,500 3,500 3,000 3,000 2,500 2,000
Table 6: The number of cw found in herbicide treated crop plants 6 and 16weeks after treatment(wat):
Number of cwplants counted per herbicide treatment made to mixed perennials
Gallery Dacthal Preen Scotts om Rout
Crop Weed:
6wat 16wat 6wat 16wat 6wat 16wat 6wat 16wat 6wat 16wat
Ixeris dentata
2 98 4 96 3 100 3 86 0 58
Viola koreana
Viola labradorica
Oxalis ace10stella
4
16
21
86
92
100
12
31
3
92
100
100
5
6
11
98
97
100
3
4
5
81
82
100
2
3
4
62
68
100
93