Cicadellidae Species Research Articles

Studies on population dynamics and spatial distribution of leafhoppers in vineyards (Homoptera: Cicadellidae)

Summary.Thirty‐two species of Cicadellidae, including the Macropsinae, Agalliinae, Penthimiinae, Aphrodinae, Cicadellinae, Typhlocybinae and Deltocephalinae, 10 of which were already known as phytoplasma vectors, were captured in vineyards using yellow sticky traps. Adult population dynamics of the most abundant species of Penthimiinae and Deltocephalinae were studied over the whole growing season. Penthimia nigra was captured in May and June, Anoplotettix fuscovenosus in June‐August, Fieberiella florii in August‐October, Macrosteles sexnotatus in May and October, Scaphoideus titanus in July‐September, Thamnotettix spp. (Th. confinis, Th. dilutior, Th. exemtus, Th. zelleri) in April‐June, while Euscelidius variegatus, Neoaliturus fenestratus, Platymetopius major and Psammotettix spp. (P. alienus, P. confinis) were trapped throughout the growing season. The aggregation level of the above species was investigated by means of Taylor's power law. A. fuscovenosus showed a nearly random distribution in vineyards (0.95 < b < 1.11), while N. fenestratus, P. major and S. titanus were strongly aggregated (1.32 < b < 1.81). The other species showed intermediate levels of aggregation (1.12 > b < 1.32). The results indicate that at least six Deltocephalinae species, A. fuscovenosus, E. variegatus, F. florii, M. sexnotatus, N. fenestratus and S. titanus, known as phytoplasma vectors and commonly found in vineyards, could play a role in Grapevine Yellows (GY) epidemiology. GY transmission trials with these species are needed.

Leafhoppers (Homoptera: Cicadellidae) from Dominican Amber

Three species of Cicadellidae from Dominican amber— Krisna garciamarquezi , new species (Krisnini), Krocarites reflexa , new genus, new species (Nirvanini), and Jassoqualus hispaniolensis , new species (Nirvanini)—are described and illustrated, and represent the first known fossil representatives of these two tribes. Nirvanini and Krisnini are not known to occur presently on Hispaniola. Descriptive notes are given for fossil species in the subfamilies Agalliinae, Cicadellinae, Typhlocybinae, and Xestocephalinae. Comparison of fossil leafhoppers from the Tertiary period to those known from the Cretaceous suggests that much subfamily-through genus-level diversification occurred between the late Cretaceous and middle Tertiary, and that modern genera existed as early as 55 million years ago.

Faunistic and systematic studies on the Cicadellidae species found in citrus orchards in East Mediterranean Region of Turkey IV

Faunistic and systematic studies on the Cicadellidae species found in citrus orchards in East Mediterranean Region of Turkey IV

Geographical variation in the genitalia of three species of Cicadellidae (Hemiptera)

AbstractSpecimens of three species of Cicadellidae, Agallia laevis Ribaut, Eupteryx stachydearum Hardy and E.urticae Fabricius, are examined from different parts of their distribution in Europe and differences in genital characters are recorded. Variation in Agallia laevis suggests a dine or stepped cline from S.E. to N.W. in the shape of the anal appendages and aedeagus, while E. stachydearum shows a N–S cline, and a similar altitudinal cline, in the length and curvature of the apical processes of the aedeagus. In E.urticae geographical variation in the size and direction of the same processes also clearly occurs, though the exact pattern is not yet clear.

Cicadellidae and Issidae (Homoptera) of Niue Island, and material from the Cook Islands

Sixteen species of Cicadellidae (Cicadelloidea)—14 from Niue I., 6 from the Cook Is, 4 shared—and 2 species of Issidae (Fulgoroidea)—1 from Niue I., 1 from the Cook Is— are recorded. Two new species of Empoasca and a new subspecies of Atylana from Niue, new species of Atylana and Calotettix from Rarotonga, and other little‐known species are described and figured. A key to the species of Cicadellidae from Niue I. is given.

THE MANITOBAN FAUNA OF LEAFHOPPERS (HOMOPTERA: CICADELLIDAE): I. DESCRIPTIONS OF NEW SPECIES AND COLOUR FORMS

AbstractEight new species of Cicadellidae are described, largely from Manitoban material: Macropsis feminis, M. sauront, M. vinea, Gyponana gracilis, Cicadula junea, Laevicephalus bison, Macrosteles (Sagatus) flavalis, and Paraphlepsius varispinus. The male genitalia of Fitchana twiningi (Uhler) is described for the first time. Colour forms of Macropsis nigricans Van D. and Balclutha punctata (Thunb.) are illustrated.

A study of the leafhopper genusCirculiferZakhvatkin (Homoptera, Cicadellidae)

does not appear. First page follows. Introduction The beet leafhopper Circulifer ienellus (Baker) is probably the most important species of Cicadellidae in North America. It is the only known vector of the curly top virus disease, which causes great losses to sugar beet, tomato, melon, spinach, bean, flax, and other crops in the western states. In the last half century huge sums of private and public money have been expended on research and control measures for curly top and the beet leafhopper. As a result, the literature on this subject is voluminous. Circulifer tenellus is the only species of the genus known to occur in the Western Hemisphere. It was described as Thamnotettix ienella Baker (1896) and later placed in the genus Eutetiix by (Forbes and Hart (1900)). Between 1900 and 1948 the name Eutettix tenellus was in common usage in literature. (Oman (1936)) pointed out the similarity of the published illustration of the male genital characters of Thamnotettix indivisus Haupt (1927), from Palestine, to those of E. tenellus and placed indivisus Haupt in synonymy with tenellus. At the same time he expressed the hope that this Mediterranean record of tenellus would be confirmed by further extensive collecting. In a later publication (Oman (1948)) determined that tenellus should be associated with a number of Mediterranean species included in the genus Circulifer(Zakhvatkin (1935)), and further confirmed its presence in the Mediterranean area after studying a syntype (cotype) of ignavus Matsumura collected in Sicily. He was of the opinion that other records of forms from the Old World might also apply to tenellus. This evidence presented by Oman led naturally to the speculation that

Growth of Insects with Reference to Progression Factors for Successive Growth Stages

The historical development of studies of insect growth has been well reviewed by Calvert (1929). Bodenheimer (1927, 1932, 1933) and Ludwig (1934) have discussed many of the available data in relation to the Dyar rule and the principle of Przibram. The present discussion is concerned chiefly with measurements of several species of Cicadellidae and an analysis of these and other data from various sources in relation to these theories.

NEW LEAFHOPPERS FROM THE WESTERN UNITED STATES (HOMOPTERA-CICADELLIDAE)

Types of the following new species of Cicadellidae are in the Snow Entomological Collection, University of Kansas, Lawrence, Kansas.Hebecephalus hilaris n. sp.Resembling H. crassus (DeL.) but head more roundingly blunt, female last ventral segment with median lobes sharp instead of rounded, and male style with foot distinctly boot-shaped. Length 3.25 mm.Color. Cinereous with fuscous markings. Vertex with typical three pairs of spots. Pronotum and scutellum more or less irrorate with brown. Veins of elytra light more or less regularly margined with brown. Venter more or less infuscated.