Experiment Station Record, Volume 92, January-June, 1945 Page: 87
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19451 ECONOMIC ZOOLOGY-ENTOMOLOGY 87
in the western United States; the industry is comparatively new in this region,
and in many instances the extent of insect damage to seed crops and the methods
of control have not yet been determined. Though the maximum infestation by
the peas weevil has been as high as 85.5 percent, the average is usually held to
less than 5 percent by the timely application of rotenone dust. The pea moth
causes severe damage to peas grown in northwestern Washington; no control
measures are as yet 'known. The weevil Sitona lineatta Lec.-recently introduced
into Washington-attacks peas, vetch, and alfalfa. 'The pea aphid is a problem
mainly in the coastal areas of the Pacific Coast States. The cabbage seed pod
weevil destroys about 25 percent of the seed crop each year in this State; and
no satisfactory control is known; the cabbage aphid and the cabbage maggot
also seriously affect cabbage seed production.
Testing wheats in the greenhouse for hessian fly resistance, W. B. CARTWRIGHT
and D. W. LAHUE. (U. S. D. A.). (Jour. Econ.' Ent., 37 (1944), No. 3, pp.
385-387, illus. 2).-Because of the difficulties in obtaining significant results with
field trials the authors have resorted to the testing of wheat varieties for hessian
fly resistance under controlled conditions in the greenhouse; the method here
described in detail has proved a satisfactory substitute for field trials because
dependable populations of flies can be made available, the testing period is more
elastic, and several thousand wheat strains can be tested and retested in a relatively
small area and with but little equipment.
The lesser cornstalk borer, a pest of fall beans, D. ISELY and F. D. MINER.
(Univ. Ark.). (Jour. Kcs. Ent. Soc., 17 (1944), No. 2, pp. 51-57, ilfus. 1).Ordinarily
considered a minor pest, this borer destroyed several thousand acres
of seedling fall beans in northwestern Arkansas in August 1943; practically all
its other hosts in this area were also infested. Most of the injury to seedling
beans appeared to be due to partly grown larvae developed in the fields on
previous crops or weed grasses. Destruction of these hosts 3-4 weeks before planting
is the most obvious means of avoiding such damage; field observations prior
to the planting of beans are suggested as a means of determining the need of
Gusano del elote: Descripci6n y procedimientos de control [The corn earworm:
Description and means of control] (Fitofilo, 2 (1943), No. 4, pp. 35-59,
Insects affecting guayule, with special reference to those associated with
nursery plantings in California, W. H. LANGE, JR. (Calif. Expt. Sta.). (Jour.
Econ. Ent., 37 (1944), No. 3, pp. 392-399, illus. 3).-The main, purpose of this
contribution is to present information collected during 1942 on insects causing injury
to nursery and field plantings of guayule in the Salinas Valley. An attempt has
also been made to tabulate the insects injuring this plant in other areas of the State
and elsewhere, so that this information may be readily available. Contrary to the
general belief, guayule has a large fauna of associated insects and several have
caused damage in localized areas of the nurseries; these infestations have not as
yet assumed major importance, but where optimum production of plants is the
objective their control is a necessity. Among the pests discussed are Diabrotica 11punctata
(Mann.), wireworms, leafhoppers, thrips, Estigmene acraea (Drury),
Agromyza virens Loew, Ligyrus californicus Csy., grasshoppers, Lygus bugs,
Pityophthorus nigricans Bland, Rhizaspidiotus dearnessi Ckll., and a gall fly. The
physiological responses of guayule to insecticides and fungicides are briefly discussed.
Potato flea beetle control in western Nebraska, R. E. HILL and H. D. TATE
(Nebraska Sta. Bul. 361 (1944), pp. 23, ilhus. 7).-Damage to potato tubers by
larvae of the flea beetle Epitrix tuberis Gentner is more important than foliage
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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/m1/100/: accessed May 25, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.