Experiment Station Record, Volume 92, January-June, 1945 Page: 88
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88 EXPERIMENT STATION RECORD [Vol. 92
injury by adults in western Nebraska. Larval damage is frequently accompanied
by severe scab infection. Adults start leaving overwintering quarters in mid-May
and continue to appear during June. This period coincides with the early growth
of potatoes planted before June 10. The first generation develops largely in the
early plantings, from which they migrate during July and August into the late (or
principal) crop to lay eggs, and the larvae (second generation) which hatch from
these attack tubers of the late crop. First-generation adults appear in early July
and those of the second about August 10. Adults feed on several wild hosts, but
larvae feed largely on solanaceous plants.
Tests to date with various insecticides, including zinc arsenite sprays, cryolite
dust, and barium, fluosilicate dust, indicate that these materials are about equally
effective. The addition of sulfur to other insecticides is thought desirable from the
viewpoint of potato psyllid control. The authors suggest elimination of early plantings,
destruction of cull dumps, combining late with early plantings, and frequent
and thorough insecticide applications to reduce flea beetle damage in western
The potato [tuber] moth: Experiments on its control, N. C. LLOYD (Agr.
Gaz. N. S. Wales, 54 (1943), Nos. 7, pp. 323-327, 337, illus. 3; 9, pp. 417-421,
illus. 4; 55 (1944), Nos. 3, pp. 107-110, 126; 5, pp. 193-196).-This paper summarizes
the life history studies and control experiments with this pest in stored
tubers, as carried out during the past 3 yr. Pyridine dust (5 percent) proved of
great value in protecting potatoes against infestation, provided a good coating is
obtained, but it will not control larvae already in the tubers. Further work is necessary
to compare more fully the performance of kaolin, magnesite, pyridine, and
derris dusts on a large scale and under conditions favorable to the moth, i. e., during
warm weather. Results from liquid dips have been disappointing because of their
failure to prevent reinfestation by succeeding generations of moths.
The external morphology of the adult tobacco hornworm (Lepidoptera:
Sphingidae), A. H. MADDEN. (Mass. State Col.). (Ann. Ent. Soc. Amer., 37
(1944), No. 2, pp. 145-160, illus. 19).-A detailed morphological description of the
adult is presented as an example of the structure of the entire family.
[Insect pests of orchard fruits] (Wash. State Hort. Assoc. Proc., 39 (1943),
pp. 43-47, 103-114, illus. 1).-The following papers are included: Insects of Soft
Fruits, by L. G. Smith and W. A. Luce (pp. 43-46) (Wash. State Col.); Relative
Value of Sulphur and of Oil in Control of Mites, by R. E. Smith (pp. 103-106);
Controlling the Codling Moth With Nonarsenicals, by E. J. Newcomer, M. A.
Yothers, F. P. Dean, C. C. Alexander, and F. W. Carlson (pp. 107-110) (U. S.
D. A.); and Timing Sprays for Codling Moth Control, by W. J. O'Neill (pp. 111114)
(Wash. Expt. Sta.).
Toxicity of ricin, ricinine, and related compounds to codling moth larvae,
E. H. SIEGLER, M. S. SCHECHTER, and H. L. HAILER. (U. S. D. A.). (Jour.
Econ. Ent., 37 (1944), No. 3, pp. 416-418).-Investigation of the toxicity of ricin
and ricinine from the castor-bean plant, synthetic ricinine, and eight closely related
compounds to codling moth larvae revealed only two of them to be effective killing
agents, viz, ricinine (1,2-dihydro-methoxy-l-methyl-2-oxonicotinonitrile) and
1,2-dihydro-1,4,6-trimethyl-2-oxonicotinonitrile. The structural formulas of both
these compounds show a methyl group attached to the heterocyclic N atom and no
free hydroxyl group attached to the ring.
Mass liberation of parasites for immediate reduction of oriental fruit moth
injury to ripe peaches, M. H. BRUNSON and H. W. ALLEN. (U. S. D. A.).
(Jour. Econ. Ent., 37 (1944), No. 3, pp. 411-416).-Studies of the effects of mass
liberations of parasites to control the oriental fruit moth were made in nine groups
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U.S. Department of Agriculture. Agricultural Research Administration. Office of Experiment Stations. Experiment Station Record, Volume 92, January-June, 1945, book, 1947; Washington D.C.. (digital.library.unt.edu/ark:/67531/metadc5064/m1/101/: accessed August 19, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.