Taxonomy, distribution, and food plants of Gyponana hasta, a leafhopper vector of California aster-yellows virus
AuthorsDwight M. DeLong
Henry H. P. Severin
Authors AffiliationsDwight M. DeLong was Professor of Entomology, Ohio State University, Columbus, Ohio; Henry H. P. Severin was Entomologist in the Experiment Station.
Hilgardia 17(3):155-163. DOI:10.3733/hilg.v17n03p155. October 1946.
Abstract does not appear. First page follows.
Severin has previously reported (1934), (1940)4 that 3 species and a biological race of leafhoppers transmit the California aster-yellows virus. In two recent papers DeLong and (Severin (1945)) and (Severin (1945)) added 6 species of phlepsid leafhopper as vectors of this virus. The present paper deals with the characters, distribution, and food plants of one additional leafhopper vector, Gyponana hasta DeLong, in a companion paper, (Severin (1946)) discusses the transmission of the virus by this, the first reported leafhopper vector in the subfamily Gyponinae.
Characters, Distribution, and Food Plants
For several years Gyponana hasta, recently described (DeLong, 1942), has been confused with and identified as Gyponana angulata Spangberg, which it resembles very closely in general appearance and in morphologic structures.
Gyponana hasia is one of the few species of this genus with an angled vertex. This species is similar to G. anqulaia in general appearance, and can be distinguished from it only by the shape of the style and aedeagus. Its length is 7.5 to 9 mm.
The vertex is somewhat strongly produced and bluntly angled, and is two thirds as long at the middle as the basal width between the eyes.
In color it is somewhat variable, but usually is dull yellow with a tinge of green. The vertex, pronotum, and scutellum (plate 1, A and B) are often definitely yellow. There are no dark nor definite color markings.
The female last ventral segment has a posterior margin which is broadly, concavely excavated, with a slight median notch (plate 1, C).
The male plates are elongate, blunt at the apex, and with a slight bulge on the outer margin near the middle- (plate 1, D). The aedeagus (plate 1, E) is long and somewhat slender, with a pair of short terminal, lateral processes which extend about one third of the distance to the basal curved part and are closely appressed to the body of the aedeagus. The style is sickle-shaped, with the apical half broadened at the base, then gradually tapered to a sharppointed apex (plate 1, F).
In comparison with Gyponana angulata, the styles are longer and the tapered part is more slender before the apex. The aedeagus is longer, narrower, with shorter lateral processes which are more closely appressed.
DeLong D. M. The North American species of the subfamily Gyponinae. The Ohio State University Graduate School monograph series. Contributions in Zoology and Entomology. 1942. 5:1-187.
DeLong D. M., Severin H. H. P. Characters, distribution, and food plants of phlepsid leaf hopper vectors of California aster-yellows virus. Hilgardia. 1945. 17(1):1-20. DOI: 10.3733/hilg.v17n01p001 [CrossRef]
Severin H. H. P. Transmission of California aster and celery-yellows virus by three species of leafhoppers. Hilgardia. 1934. 8(10):339-61. DOI: 10.3733/hilg.v08n10p337 [CrossRef]
Severin H. H. P. Potato naturally infected with California aster yellows. Phytopathology. 1940. 30(12):1049-51.
Severin H. H. P. Evidence of nonspecific transmission of California aster-yellows virus by leafhoppers. Hilgardia. 1945. 17(1):21-59. DOI: 10.3733/hilg.v17n01p021 [CrossRef]
Severin H. H. P. Transmission of California aster-yellows virus by the first reported leafhopper vector in Gyponinae. Hilgardia. 1946. 17(3):139-50. DOI: 10.3733/hilg.v17n03p139 [CrossRef]
Also in this issue:Improving the productivity of pruning labor in the vineyard
Fungicidal corm dips for gladiolus
Effect of seed piece spacing on the production of sweet potato transplants
Thrips control on nectarines
West Side Field Station
Cotton price policy and foreign production
A progress report: Concentrate spraying controls pests in deciduous fruit and nut crop tests
Late plantings reduce yellows virus infection, improve beet yields and sugar production at Davis
Nematocides for use on alfalfa
Longevity, or life histories, of leafhopper species on virus-infected and on healthy plants
Transmission of California aster-yellows virus by the first reported leafhopper vector in Gyponinae