Investigations of Beet Leafhopper (Eutettix Tenella Baker) in Salinas Valley of California

Severin, Henry H. P.

doi:10.1093/jee/16.6.479

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“…Migrations of the spring-generation adults occur from the San Joaquin Valley to the foothills and cultivated areas of the Salinas Valley, as reported in a previous paper (16). 12,No.8 planted beets in the San Joaquin and Salinas valleys were infected with curly top by the overwintering females which remained in the cultivated areas (10).…”

Section: Hilgardiasupporting

confidence: 62%

Factors affecting curly-top infectivity of the beet leafhopper,Eutettix tenellus

Severin¹

1939

Hilg

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During the years 1926 to 1933 but not during 1924, each leafhopper was fed on the first beet for a period of 2 weeks and then was provided with a second healthy beet, except those specimens which had transmitted the curly-top virus to the first plant. INFECTIVITY OF BEET LEAFHOPPERS IN DESERT, FOOTHILL, AND CULTIVATED AREAS Near and•Away from Beet Fields.-In 1918, tests were made to determine whether beet leafhoppers were infective in localities where no sugar beets were grown and also in the vicinity of beet fields. The results are given in table 1. Adults were collected on different species of plants TABLE 1 PLANTS FROM WHICH BEET L,EAFHOPPERS TRANSMITTED CURLY-Top VIRUS TO SUGAR BEETS Plants on which insects were collected Date District Number of insects were insects tested collected, Common name Scientific name 1918

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Section: Hilgardiasupporting

confidence: 62%

Factors affecting curly-top infectivity of the beet leafhopper,Eutettix tenellus

Severin¹

1939

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“…From available records, E. tahae seems to require the shortest amount of time to complete summer development, 7 or 8 days, an average of 15 and a maximum of 26 (1, 39, 62). Several species require about 30 days (25,77,91,130,174,185); from 30 to 66 days is required for several species (83,182,183,211). The longest period re corded for nymphal development is 10 months in the case of DorycephaZus platyrhynchus (4).…”

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The Bionomics of Leafhoppers

DeLong¹

1971

Annu. Rev. Entomol.

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The recent publication of the Metcalf catalogue of world Cicadelloidea (128) listed 4378 species, placed in 591 genera and 54 subgenera. These were assigned to the following 17 different families: Tettigellidae, Hylici dae, Gyponidae, Ledridae, Ulopidae, Evacanthidae, Nirvanidae, Aphrodidae, Hecalidae, Euscelidae, Coelidiidae, Eurymclidae, Macropsidae, Agalliidae, Iassidae, Idioceridae, and Cicadellidae. The catalogue includes all of the lit erature on the leafhoppers to 1942. Since that time at least 1200 additional species and 100 additional genera have been described. The world literature at the present time therefore covers some 5500 to 6000 species and probably 700 or more genera.Morphological characters have been used predominantly for the classifi cation of the leafhoppers, particularly the type, form, and venation of wings, structures of the head and crown, position of the ocelli, general shape of the body, and the genital structures of both sexes. The character of the structures of the male genital chamber, the styles, aedeagus, connective, plates, pygofer, and the apodemes on the anterior portion of the abdomen have been used especially for the separation of species. In most groups these characters are excellent for specific identification. In a few groups, Oncop sis Burmeister, for instance, they have proved to be of little or no value. ISOLATED POPULATIONS, MUTANTS AND SPECIES CONCEPTSCertain species of leafhoppers such as Macrosteles fascifrons have a wide geographical range through different life zones extending from Mex ico and Puerto Rico to Alaska, from tropical to arctic habitats. As now rec ognized by taxonomists, this species is a complex of genetic mutants rang ing in size from 2.0 to 5.1 mm and occurring on a great variety of host plants. Economic and ecologic studies have revealed isolated popUlations of this species which were biologically, ecologically, or physiologically specific but could not be separated morphologically. Beirne (6), after a detailed study of all of the material in the genus Ma cyosteles, has affirmed that physiologic species and isolated ecologic popula tions undoubtedly exist and that the progeny of certain populations are sed entary, which would favor isolation. Severin (180) failed in his attempt to mate a long-winged form from the Montara Mountains of California with a short-winged form from the eastern United States. With the exception of the wing condition these were not different morphologically. The occur-179 6007 Annu. Rev. Entomol. 1971.16:179-210. Downloaded from www.annualreviews.org Access provided by Michigan State University Library on 02/07/15. For personal use only. Quick links to online content Further ANNUAL REVIEWS

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Role of Circulifer/Neoaliturus in the Transmission of Plant Pathogens

Klein

1992

Advances in Disease Vector Research

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Investigations of Beet Leafhopper (Eutettix Tenella Baker) in Salinas Valley of California

Cited by 3 publications

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Factors affecting curly-top infectivity of the beet leafhopper,Eutettix tenellus

Factors affecting curly-top infectivity of the beet leafhopper,Eutettix tenellus

The Bionomics of Leafhoppers

Role of Circulifer/Neoaliturus in the Transmission of Plant Pathogens

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