10 INSECTS AFFECTING VEGETABLE AND TRUCK CEOPS. 
be discovered. Undoubtedly also wasps of the genus Polistes. be- 
sides Limnerium kawaiiensc Cram.. CheJonus blc&feburm Cram., and 
Oremastus hymti\><± Vier.. enemies of H. fascialis in Hawaii, will 
attack this species in its larval condition. 
CONTROL. 
It is obvious from the notes on the occurrence of this inseet that 
injury was discovered too late for rhe application of insecticides. In 
practically every case the larva? were in the last stage, the few younger 
larva? merely indicating the exception to the rule. Such being the 
case it was not possible to test any remedies whatever. It is inter- 
esting to relate, however, in the case of Swiss chard, that many of the 
plants, being able to withstand a considerable degree of cold, re- 
covered and put forth new leaves, practically a second crop of leaves 
developing, and that the moths hatched from all larva? and did not 
deposit egg^. at least not in confinement. TVTiat they would do under 
natural conditions is not quite certain for this latitude. 
In the case of the related Hawaiian beet webworm. Mr. H. O. Marsh 
has demonstrated that Paris green applied at the rate of '2 pounds 
in 100 gallons of water did not burn beet foliage, and the same would 
be true of chard and the ornamental plants which this species attacks. 
TVhale-oil soap at the rate of S pounds to 100 gallons of water is 
added, and serves as an effective adhesive agent or " sticker." thus 
enabling a more even distribution of the poison over the leaf surfaces. 
In addition to Paris green. Mr. Marsh demonstrated that nicotine 
sulphate, used at the rate of 1 fluid ounce to 1 ounces of whale-oil 
soap and 1 gallons of water, sprayed upon cabbage, resulted in the 
destruction of other small and larger larva?. He expresses the belief 
also, reasoning from analogy, that this formula, although not actually 
tested on Hymenia larvae, would probably prove entirely effective. 
Arsenate of lead and arsenite of zinc should both be tested for this 
insect should it occur in numbers and an opportunity be afforded for 
an early application of these poisons as sprays. The most important 
item in the control of this insect is the detection of injury early in the 
season, before actual damage is accomplished. Among other remedies 
fall plowing should be practiced. It is unwise to grow susceptible 
plants in the same locality in which this insect has been abundant 
the previous season. 
There is no proof as yet that as far north as the District of Colum- 
bia this species will in the near future renew attack or become as bad 
a pest as in 1912. The possibility exists, however, and a close look- 
out will be kept for its reappearance. 
