University of California

Bionomics of the walnut husk fly, Rhagoletis completa


A. M. Boyce

Author Affiliations

A. M. Boyce was Assistant Professor of Entomology and Assistant Entomologist in the Citrus Experiment Station.

Publication Information

Hilgardia 8(11):363-579. DOI:10.3733/hilg.v08n11p363. October 1934.

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Abstract does not appear. First page follows.

The persian walnut (Juglans regia) industry of the United States is centered in the state of California, where approximately 97 per cent of the tonnage is produced.(4) Batchelor(4) estimates that the bearing acreage for 1930 was 95,900 acres, with an expected increase of approximately 6,000 acres a year for the next three years. Concerning the economics of the industry he states, “Pest control is becoming an increasingly costly operation in some localities, and this is causing the replanting of former walnut acreage to crops not subject to the pests in question.”

The recorded insect fauna(3) of the genus Juglans numbers over 300 species, only a small number of which occur in California. Before the advent of the walnut husk fly, Rhagoletis completa Cresson, the codling moth, Carpocapsa pomonella (Linn.), and the walnut aphid, Chromaphis juglandicola (Kalt.) were the only species considered to be of major importance to the industry. With the addition of another major pest, the production costs will necessarily be increased in those localities where susceptible varieties are grown.

It is of interest to note that Rhagoletis completa is the first species of Trypetidae of major economic importance to become established in California.

Literature Cited

[1] Anonymous. Common names of insects approved for general use by American economic entomologists. Jour. Econ. Ent. 1930. 23(3):639

[2] Back E. A., Pemberton C. E. The melon fly in Hawaii. U. S. Dept. Agr. Bul. 1917. 491:1-64.

[3] Barrett R. E. An annotated list of the insects and arachnids affecting the various species of walnuts or members of the genus Juglans Linn. Univ. California Pubs. Ent. 1932. 5 p. 275-309.

[4] Batchelor L. D. Walnut culture in California. California Agr. Exp. Sta. Bul. 1929. 379:1-110. http://archive.org/details/walnutculture3791929batc

[5] Boyce A. M. The walnut husk fly, Rhagoletis juglandis Cresson. Jour. Econ. Ent. 1929. 22 p. 861-866.

[6] Boyce A. M. The diapause phenomenon in insects, with special reference to Rhagoletis completa Cress. Jour. Econ. Ent. 1931. 24 p. 1018-1024.

[7] Braucher O. L. Relation of irrigation to control of the walnut husk fly. Diamond Walnut News. 1932. 14(4):11

[8] Brooks F. E. Walnut husk-maggot. U. S. Dept. Agr. Bul. 1921. 992:1-8.

[9] Caldis P. D. Souring of figs by yeasts and the transmission of the disease by insects. Jour. Agr. Research. 1930. 40(11):1031-1051.

[10] Campbell F. L. A comparison of four methods for estimating the relative toxicity of stomach poison insecticides. Jour. Econ. Ent. 1930. 23(2):357-370.

[11] Cresson E. T. Jr. Descriptions of New North American acalyptrate Diptera. II (Trypetidae, Sapromyzidae). Ent. News. 1920. 31:65-66.

[12] Cresson E. T. Jr. A revision of the North American species of fruit flies of the genus Rhagoletis (Diptera: Trypetidae). Trans. Amer. Ent. Soc. 1929. 55: p. 401-414.

[13] Efflatoun H. C. On the morphology of some Egyptian trypaneid larvae (Diptera) with descriptions of some hitherto unknown forms. Bul. Société Royale Entomologique d’Égypte. (Nouvelle série). 1927. 1:17-50.

[14] Flint W. P., Farrar M. D. The use of mineral oils for better dusts. Jour. Econ. Ent. 1932. 25(2):269-271.

[15] Fluke C. L., Allen T. C. The role of yeast in life history studies of the apple maggot, Rhagoletis pomonella Walsh. Jour. Econ. Ent. 1931. 24 p. 77-80.

[16] Frost S. W. Further studies of baits for Oriental fruit moth control. Jour. Econ. Ent. 1927. 20(1):167-174.

[17] Gambrell F. L. The fruit flies of New York. Jour. Econ. Ent. 1931. 24(1):226-232.

[18] Graham-Smith G. S. Flies and disease (See specifically. 1913. London: Cambridge Univ. Press. p. 63-67.

[19] Greene C. T. Characters of the larvae and pupae of certain fruit flies. Jour. Agr. Research. 1929. 38(9):489-504.

[20] Hartzell F. Z. The use of biometrical methods in the interpretation of codling moth experiments. Jour. Econ. Ent. 1924. 17(2):183-192.

[21] Headlee T. J., Ginsburg J. M. Some substitutes for arsenic in control of codling moth. Jour. Econ. Ent. 1930. 23(1):45-53.

[22] Hood C. E. Fish oil as an adhesive in lead-arsenate sprays. U. S. Dept. Agr. Tech. Bul. 1929. 111:1-28.

[23] Illingworth J. F. A study of the biology of the apple maggot (Rhagoletis pomonella), together with an investigation of methods of control. New York [Cornell] Agr. Exp. Sta. Bul. 1912. 324:125-187.

[24] Loew H. Trypeta suavis Loew. Monograph of the Diptera of North America. Part 1862. 1:p.175.

[25] Lovett A. L. The cherry-fruit fly. Oregon Agr. Exp. Sta. Cir. 1923. 35:1-4.

[26] Marcovitch S. Studies on toxicity of fluorine compounds. Tennessee Agr. Exp. Sta. Bul. 1928. 139:1-48.

[27] Marcovitch S., Stanley W. W. Cryolite and barium fluosilicate: their use as insecticides. Tennessee Agr. Exp. Sta. Bul. 1929. 140:1-19.

[28] McIndoo N. E. An insect olfactometer. Jour. Econ. Ent. 1926. 19(3):545-571.

[29] Peterson A. Some baits more attractive to the Oriental peach moth than black-strap molasses. Jour. Econ. Ent. 1927. 20(1):174-184.

[30] Phipps C. R., Dirks C. O. Dispersal of the apple maggot. Jour. Econ. Ent. 1932. 25(3):576-582.

[31] Porter B. A. The apple maggot. U. S. Dept. Agr. Tech. Bul. 1928. 66:1-48.

[32] Ripley L. B., Hepburn G. A. A new olfactometer successfully used with fruit flies. Ent. Sec. Div. Pl. Ind. [Pretoria, South Africa] Memoir. 1929. 6:55-74.

[33] Ripley L. B., Hepburn G. A. Studies on the reactions of the Natal fruit fly to fermenting baits. Ent. Sec. Div. Pl. Ind. [Pretoria, South Africa] Memoir. 1929. 6:19-53.

[34] Ripley L. B., Hepburn G. A. Non-arsenical fruit fly poisons. Ent. Memoirs, Dept. of Agr., Union of So. Africa, Memoir. 1931. 7:17-23.

[35] Smith R. H. Experiments with toxic substances in highly refined spray oils. Jour. Econ. Ent. 1932. 25(5):988-990.

[36] Snodgrass R. E. Anatomy and metamorphosis of the apple maggot, Rhagoletis pomonella Walsh. Jour. Agr. Research. 1924. 28 p. 1-36.

[37] Tattersfield F., Morris H. M. An apparatus for testing the toxic values of contact insecticides under controlled conditions. Bull. Ent. Research. 1924. 14:223-233.

[38] Trevan J. W. The error of determination on toxicity. Roy. Soc [London] Proc. Series. 1927. B101:483-514. DOI: 10.1098/rspb.1927.0030 [CrossRef]

[39] Uvarov B. P. Insect nutrition and metabolism. A summary of the literature. Ent. Soc. London. Trans. Part II. 1928. p. 255-343.

Boyce A. 1934. Bionomics of the walnut husk fly, Rhagoletis completa. Hilgardia 8(11):363-579. DOI:10.3733/hilg.v08n11p363
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