22 PAPERS OX IXSECTS AFFECTING VEGETABLES. 
sell, at Cutler, Fla., March 23-29, 1909. It is interesting to remark 
that Mr. H. O. Marsh has found this species very destructive to sugar 
beets in Hawaii, and has made a special study of it for the Bureau 
of Entomology. 
An agromyzid fly was reared February 17, 1909, with this beet 
webworm from material received from Mr. H. M. Russell on beets 
and Amaranthus collected at Boynton, Fla. 
Pegomya ruficeps Stein, an anthomyiid fly, was reared under prac- 
tically the same conditions as the moth Hymenia fascialis Cram., 
above mentioned. 
REMEDIES. 
The remedies that have been advised for use against the garden 
webworm (Loxostege' similalis Guen.) should be found about equally 
effective against the present species. In any case their use is advised 
until more is learned of the habits of the southern beet webworm. 
These remedies are given below. 
Paris green. — Paris green is applied at the rate of 1 pound to from 
75 to 100 gallons of water, or dry, distributed with a powder gun, as 
practiced in the South. The latter method, however, is inferior to 
spraying. Since the two species share common natural food plants 
(Amaranthus), the usual care should be exercised to avoid planting 
beets in fields which have grown up in this weed until after thorough 
fall or spring plowing. 
The experience which Mr. H. 0. Marsh has had with the related 
Hawaiian webworm conclusively shows the value of Paris green. He 
states, in brief, that a spray of Paris green at the rate of 2 pounds of 
the arsenical and whale-oil soap, 8 pounds in 100 gallons of water, 
proved absolutely effective and did no injury to the plants on which 
it was applied. The spray was applied to the underside of beet 
leaves. 1 More complete information in regard to this is given in 
Part I of the present bulletin. 
It should be added that a mixture composed of nicotine sulphate, 
1 fluid ounce, with whale-oil soap, 4 ounces, in 4 gallons of water, 
was used by Mr. Marsh against a number of noxious lepidopterous 
larvae, and although this formula was not tested on tne Hawaiian 
beet webworm, he believes that it would prove entirely effective. 
Dragging the log.— In the case of a bad attack of the garden web- 
worm in Oklahoma hi 1903, a satisfactory barrier to migration was 
employed, consisting of a dust furrow in which a log was dragged. 
This might be used in case the webworm under discussion should 
occur in great numbers before its presence is discovered-— something 
that is likely to happen, as in the case of species of related habits. 
i For some reason arsenate of lead applied to both sides of Amaranthus leaves was found ineffective and 
no explanation could be made of this, but the chemical was probably not pure. 
o 
