PROGRESS EEPORT ON THE EUROPEAN CORN BORER 
21 
Table 1. — Classified list of P. nubilalis host plants — Continued 
CLASS 3.— PLANTS OCCASIONALLY ATTACKED— Continued 
Names of plants 
Parts attacked 
Nettle ( Urtica lyallii Wats.) 
Oat (Avena sativa L.) 
Do. 
Orach ( Atriplex sp.) 
Do. 
Prickly lettuce, Wild L. (Lactuca sp.) . 
Do. 
Purslane (Portulaca oleracea L.) 
Do. 
Salvia, scarlet sage (Salvia splendens Ker-Gawl.) ... . 
Sow thistle ( Sonchus spp.) 1 
Stems. 
Spinach (Spinacia oleracea L.) 
Strawflower (Helichrysum bracteatum Andr.) 2 .. . 
Stalks, flower stems. 
Thistle (Cirsium spp.) > . . . 
Stems. 
Tomato (Ly coper sicon esculentum Mill.) 
Stalks, fruit. 
Velvetleaf (Abutilon theophrasti Medic.) 2 . . 
Stems. 
Yarrow (Achillea millefolium L.)... 
Do. 
CLASS 4. PLANTS BARELY ATTACKED 
Ageratum (Ageratum houstonianum Mill.) 
Apple-of-Peru (Nicandra physalodes (L.) Pers.) 2 
Ailanthus (Ailanthus sp.) 2 
Apple (Pyrus malus L.) 
Asparagus (Asparagus officinalis L.) 3 
Balsam (Impatiens balsamina L.) 
Blackberry (Rubus sp.) 3 . 
Black-eyed Susan (RudbecMa hirta L.) 
Blister cress (Cherinia cheiranthoides (L.) Link) 
Blue vervain ( Verbena hastata L.) 
Cabbage (Brassica oleracea capitata L.) 3 
California poppy (Eschscholizia sp.) 
Candytuft (Poeris sp.) 
Cardoon (Cynara cardunculus L.) 2 
Catnip (Nepeta cataria L.) 3 
Cat-tail (Typha latifolia L.)... 
Cauliflower (Brassica oleracea botrytis DC.) 
Celandine (Chelidonium majus L.) 3 
Chicory (Cichorium intybus L.) 
Clover, Alsike (Trifolium hybridum L.) 
Coltsfoot (Tussilago farfara L.) 2 
Cornflower (Centaurea cyanus L.) 
Cucumber (Cucumis sativum L.) 
Cup-plant (Silphium perfoliatum L.) 2 
Daisy, ox-eye (Chrysanthemum leucanthemum L.) 
Elder (Sambucus canadensis L.) 3 
Endive (Cichorium endivia L.) 2 , 3 
Evening primrose (Oenothera sp.) 3 
False dragon head (Physostegia virginiana (L.) Benth.) 2 
Fleabane (Erigeron annuus (L.) Pers.) 
Foxtail, green (Chaetochloa viridis (L.) Scribn.) 
Foxtail, yellow (Chaetochloa lutescens (Weigel) Stuntz) 
Grape, Concord (Hort. var. of Vitis labrusca L.) 
Groundsel, common (Senecio vulgaris L.) 2 
Hedge mustard (Sisymbrium sp.) 3 
Heliotrope (Heliotropium peruvianum L.) . 
Horsetail (Equisetum sp.) 
Jerusalem cherry, false (Solanum capsicastrum Link) 
Jewelweed (Impatiens biflora Walt.) 
Joe-pye weed (Eupatorium sp.) 
Johnson grass (Holcus halepensis L.) 2 
Knapweed (Centaurea nigra L.) 3 
Locust, common (Robinia pseudoacacia L.) 
Love-lies-bleeding (Amaranthus caudatus L.) 2 
Mallow (Hibiscus sp.) 3 
Maple-leaf goose foot (Chenopodium hybridum L.) 2 
Marigold, Aztec or African (Tagetes erecta L.) 
Mayweed (Anthemis cotula L.) 
Mignonette (Reseda odorata L.) 
Milkweed (Asclepias spp.) 3 
Millet, golden wonder (Chaetochloa italica germanica (Mill.) Farwell) 2 . 
Millet, Hungarian (Chaetochloa italica (L.) Scribn.) 2 
Millet, pearl (Pennisetum glaucum (L.) R. Br.) 2 
Mint (Mentha spp.)i 
Night-flowering catchfly (Silene noctiflora L.) 2 
Nightshade, black (Solanum nigrum L.) 
Okra or gumbo (Hibiscus esculentus L.) 2 
Oswego bee balm (Monarda didyma L.) 2 , 3 ... 
Pansy (Viola tricolor L.) 
Parsnip (Pastinaca sativa L.) 
Peanut (Arachis hypogaea L.) 2 
Stalks, flower stems. 
Stems. 
Leaf stems. 
Fruit (wind-falls). 
Mature stalks. 
Stems. 
Canes. 
Stems. 
Do. 
Do. 
Stalks. 
Stems. 
Do. 
Leaf stalks. 
Stems. 
Do. 
Leaf stalks. 
Stems. 
Do. 
Do. 
Leaf stalks. 
Stems. 
Fruit. 
Stems. 
Flower stems. 
Branches. 
Stalks, seed heads. 
Stems. 
Stems. 
Do. 
Stems, seed heads. 
Do. 
Stems, fruit. 
Stems. 
Do. 
Flower stems. 
Stems. 
Fruit. 
Stems. 
Do. 
Do. 
Do. 
Sprouts. 
Stems. 
Do. 
Do. 
Stalks. 
Stems. 
Stalks 
Stems. 
Do. 
Do. 
Do. 
Stalks. 
Stems. 
Do. 
Stalks. 
Stalks, flower stems. 
Stems. 
Stalks. 
Stems. 
1 Two or more species or varieties are grouped under this common name. The names 
of these species will be furnished to interested persons. 
2 Plants occurring rarely or grown only in the experimental fields. These plants are 
classified according to their susceptibility rather than the frequency in which they are 
found infested. 
3 Plants which apparently serve only as shelter for the larvae. 
