22 
Table 1. — Classified list of P. nubilalis host plants — Continued 
CLASS 4.— PLANTS RARELY ATTACKED— Continued 
Names of plants 
Parts attacked 
Pear (Pyrus communis L.) 
Fruit. 
Do. 
Prince's feather (Amaranthus hypochondriachus L.) 2 -- -- - . ... _ 
Stalks, flower heads. 
Rape (Brassica napus L.) 2 
Leaf stalks. 
Stalks. 
Canes. 
Stems. 
Do. 
Rose loosetrife (Lythrum sp.) 2 , 3 - - - - ----- .. 
Do. 
Do. 
Do. 
Shepherd's purse (Bursa bursa-pastoris (L.) Weber) 3 .. 
Do. 
Sorrel, field or sheep (Bumex acetosella'L.). .J' __ ..... 
Do. 
Stalks. 
Stems. 
Leaf, stalks, fruit. 
Stems. 
Do. 
Leaf stalks. 
Stems, leaf petioles. 
Summer cypress (Kochia trichophylla Stapf.) 
Summer squash (Cucurbita sp.) 2 
Stems. 
Leaf stalks, fruit. 
Stems. 
Do. 
Timothy (Phleum pratense L.) .. . . . ....... . - . 
Stems, seed heads. 
Tobacco (Nicotiana tabacum L.) 2 
Stalks. 
Stalks. 
Wheat ( Triticum sativum L.) .. _ ______________ 
Stems. 
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. 
The insect has been reared from egg to adult in many of the 
plants in the first three classes, while eggs, larvae, and pupae have 
been collected from the majority of them in the field. Egg clusters 
have also been found in the field on dandelion (Leontodon spp.), 
horseradish (Eadicula armorada), lettuce (Lactuca sativa), oxalis 
{Oxalis spp.), plantain (Plantago sp.), and rye (Secale cereale), 
although the larvae are not known to feed on these plants. Under 
experimental conditions the borer has succeeded in competing v its 
life history upon bluegrass (Poa pratensis L.). Sufficient evidence, 
therefore, has been accumulated to show that the species is capable 
of completing its development and existing independently of corn, 
a fact which is substantiated by the status of the borer as a pest of 
hops, millet, hemp, and other crops in the Old World, and by its 
distribution in regions beyond the climatic limits where corn may be 
grown. 
EASTERN NEW YORK 
The infestation in eastern Xew York has been confined practi- 
cally to corn. Occasional specimens, however, have been found in 
giant ragweed, green foxtail, smartweed, beggar-ticks (fig. 5), pig- 
weed, and cocklebur. 7 
LAKE ERIE REGION 
Although corn is infested to a greater extent than any other plant 
throughout the Lake Erie region, a light infestation (to January 1, 
1924) has been recorded in western Xew York, in the following 
weeds: Barnyard grass, beggar-ticks, common burdock, cocklebur, 
7 For scientific names see classified list in Table 1. 
