INSECTS AND OTHER ANIMAL Pests INsuRIOUS TO FIELD BEANS 1017 
melons, radishes, potatoes, and turnips. Lintner cites also an instance of 
injury to nursery stock which was planted after an infested crop of 
potatoes. The writer has observed these millepedes feeding beneath the 
ground on young hop vines before they had become hardened, and they 
have often been found in decaying roots and vines that had been injured 
by the hop-vine borer (Gortyna immanis Guenée). Millepedes thrive 
under moist conditions, and their attraction to growing plants is often due to 
decay started in the tissues by excess moisture. 
The blue-banded millepede is said to deposit its small, white, spherical 
eggs in the spring, in clusters surrounded by particles of dirt and excreta. 
In midsummer, specimens of all sizes may be found feeding together. 
Two hundred millepedes were fourid in one potato by Lintner. The pests 
often gather and crawl over one another, forming moving balls of animal 
life. Late one evening in September, 1919, at Perry, hundreds were found 
crawling on sidewalks, in gutters, and even up the sides of houses. By 
morning they had nearly all disappeared. 
There is no satisfactory control for millepedes under field conditions. 
A bait of poisoned potato buried in the ground is said to be of use in gardens. 
Tobacco dust seems to have some repellent effect, and on a small scale 
spraying the ground with Black-leaf40, 1 part to 750 parts of water as 
recommended for control of the hothouse millepede (Oxidus gracilis Koch), 
may be effective. 
THE SOLANUM ROOT LOUSE 
(Trifidaphis radicicola Essig’) 
Kach year a few bean plants have been found with their roots serving as 
hosts for the solanum root louse, 7'rifidaphis radicicola (Homoptera, Aphid- 
idae). If the aphides are numerous, the leaves turn yellow and the plants 
take on a wilted appearance, due to the injury to the lateral roots caused 
by the feeding of the pest. Infested plants have been found from June 22 
to August 22. Only the apterous forms of the insect were seen, and usually 
there were more immature than fully developed lice present. These 
aphides are cream-colored, but their powdery covering frequently gives 
‘them a white, woolly appearance. An ant, Solenopsis molesta Say, is 
often in attendance. 
A bean grower near Castile, New York, informed the writer that in 1915 
his entire fied was so badly attacked that the crop was ruined. When 
beans were planted in this field the next year they were again infested and 
had to be dragged up. Lice of this species have also been found in small 
numbers near Batavia, in Genesee County. 
T. radicicola is reported from California by Essig (1909 and 1913) as 
feeding on rough pigweed (Amaranthus retroflecus), beet (Beta vulgaris), 
black nightshade (Solanum nigrum), and potato (Solanum tuberosum). 
9Determined by Miss E. Patch, 
