Experiment Station Record, Volume 39, July-December, 1918 Page: 60
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60 EXPERIMENT STATION RECORD. [Vol. 59
[Work with cranberry insects in 1916], H. J. FRANKLIN (Massachusetts
Sta. Bui. 180 (1917), pp. 223-234).-The author reports that the beetles which
infested cranberry roots the previous year (E. S. R., 36, p. 54) were reared to
adults and identified as the cranberry rootworm (lRhabdopterus picipes), studies
of which insect by Scammell have been noted (E. S. R., 33, p. 456). The application
of 2.25 lbs. of arsenate of lead and 1-i heaping teaspoonfuls of white
arsenic to 40 gal. of water applied on July 3 and repeated on the eleventh
and eighteenth days appeared to have destroyed the beetles.
The submergence of the eggs and caterpillars of the gipsy moth for varying
periods are reported upon. The results, together with observations of bog
flooding, led to the conclusion that reflowing for the gipsy moth will be most
satisfactory if done while the worms are small and before the largest are more
than -f in. long. The sooner it is done after all the eggs have hatched the less
will be the damage from the feeding of the worms and the less the trouble from
their floating ashore alive, as it appears to be the habit of the very young caterpillars
to cling to their support when submerged. To be entirely effective,
even when the worms are small, the flowage must be held for nearly 40 hours.
A brief report of experiments by C. W. Minott on the wind dispersion of gipsy
moth caterpillars on cranberry bogs conducted during May and June, 1916,
is incorporated. Six cotton cloth screens in two sections, each section being
3 by 10 ft., to which tanglefoot was applied were located on bogs at distances
from woodland infestations ranging from 400 to 1,200 ft. From one screen
located at 600 ft. from infested woodland on the northwest and 900 ft. on the
west, 62 snall caterpillars were removed during the season, or slightly more
than one to the square foot.
Observations of the season on the effect of resanding on the abundance of
the cranberry tipworm (Dasyneura vaccieii) sustained the conclusions previously
reported. A chalcidid (Tetrastichus sp.) and two prototrypids
(Aphanogmus sp. and Ceraephron sp.) were reared from the larvse of the last
brood after they had encased themselves in their cocoons.
In control work with the black-head fire worm blackleaf 40 at the rate of
1: 400 to which was added resin fish-oil soap at the rate of 2 lbs. to 50 gal. of
water failed to control the first brood entirely, but checked the pest sufficiently
so that the plats remained green while the surrounding bog had turned rather
brown. The application of nicotin sulphate appears at present to be the only
really effective measure of controlling the first brood, two and perhaps three
applications being advisable. As a treatment of the second brood it may have
to compete with arsenate of lead, which is far more effective with the second
brood than with the first.
The injury caused by the cranbery fruit-worm in 1916 was the least of which
there is any record. Parasitism of its eggs by Trichogrnama minuta ranged
from 25 to 75 per cent on dry bogs and from none to about 75 per cent on those
with winter flowage. Parasitism by Phanerotomna franllini, previously referred
to as P. tibialis, ranged from 24 to about 55 per cent on dry bogs (without
winter flowage) and from none to about 33 per cent on flowed ones.
Pristoneriadia agilis was very scarce, the percentage of parasitism ranging from
none to 5.5 on flowed bogs and from 4.5 to 10 on strictly dry ones. Submergence
tests are reported, which seem to prove that the effect of submergence on the
worms in their cocoons depends largely on the temperature of the water, and
suggest that a flowage after picking if begun before October 1 and continued for
12 or possibly even 10 days may control this insect as well as late holding of
winter flowage usually does. Under the heading of bog management the effect
of late holding of a deep winter flowage, etc., are discussed.
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General Index to Experiment Station Record, Volumes 26-40, 1912-1919 (Book)
A topical, alphabetically arranged index to volumes 26-40 including experiment station records, publications reviewed, and foreign publications. In has a 'Consolidated Table of Contents' which lists all editorial notes and publications of the experiment stations and Department of Agriculture from the referenced volumes.
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United States. Office of Experiment Stations. Experiment Station Record, Volume 39, July-December, 1918, book, 1919; Washington D.C.. (https://digital.library.unt.edu/ark:/67531/metadc5015/m1/89/: accessed April 25, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.