Plant symptoms induced by feeding of some leafhopper species
AuthorHenry H. P. Severin
Author AffiliationsHenry H. P. Severin was Entomologist in the Experiment Station.
Hilgardia 17(5):217-226. DOI:10.3733/hilg.v17n05p217. January 1947.
Abstract does not appear. First page follows.
In a recent paper, (Severin, Horn, and Frazier (1945))3 described certain symptoms of curly top or aster yellows induced by the saliva of Xerophloea vanduzeei Lawson. On sugar beets it produced cleared veinlets, considered a reliable symptom of curly top. On asters it caused cleared venation with yellow veinbanding, stunting of the plants, development of axillary shoots from the bud in the axil of the leaves, and virescence of the flowers, all symptoms of aster yellows. The most striking effect produced by the feeding of the leafhoppers is breaking in color of the petals of asters.
In an investigation of a large number of leafhopper vectors of the California aster-yellows virus, 10 species induced symptoms on healthy China aster (Callistephus chinensis) and Golden Self-Blanching celery (Apiumgraveolens var. dulce) apparently by the saliva or by the feeding. A brief description of the symptoms produced by these leafhopper species follows.
Texananus Latipex Delong
In working on the life history of Texananus latipex it has been observed that some single noninfective nymphs induce cleared veins and veinlets with yellow veinbanding (plate 1, A) on the youngest leaf of healthy celery plants. In a later stage numerous small, green islands develop, surrounded by yellow areas (plate 1, B). Chlorotic areas appear on the intermediate leaves with scattered green islands. In the advanced stages, chlorosis gradually spreads on the inner and intermediate leaves until all of these leaves are yellow.
Texananus Lathropi Osborn and Lathrop
The symptoms produced by the feeding of some single noninfective nymphs of Texananus lathropi are similar to those described for T. latipex.
Texananus Pergradus DeLong
With this species the symptoms on the youngest leaf of healthy celery caused by the feeding of the leafhoppers are cleared veins and veinlets with white veinbanding (plate 1, C), followed by mottling.
Texananus Spatulatus van Duzee
The symptoms on the leaves of healthy celery induced by the feeding of nymphs and adults vary according to the populations of the leafhoppers. The first symptom is a clearing of the veins and veinlets (plate 2, A) on the youngest leaf of healthy celery, accompanied later with yellow veinbanding (plate 2, B).
Severin H. H. P. Yellows disease of celery, lettuce, and other host plants transmitted by Cicadula sexnotata (Fall.). Hilgardia. 1929. 3(18):543-83. DOI: 10.3733/hilg.v03n18p543 [CrossRef]
Severin H. H. P., Freitag J. H. Western celery mosaic. Hilgardia. 1938. 11(9):493-558. DOI: 10.3733/hilg.v11n09p493 [CrossRef]
Severin H. H. P., Douglas Horn F., Frazier N. W. Certain symptoms resembling those of curly top or aster yellows, induced by saliva of Xerophloea vanduzeei. Hilgardia. 1945. 16(7):335-60. DOI: 10.3733/hilg.v16n07p335 [CrossRef]
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Sugar in beet roots limited by high temperatures and high levels of soil nitrogen in Kern County tests
Packing nectarines to reduce shrivel
Effect of soil temperatures and nitrogen fertilization on soft chess
Low soil oxygen most damaging to plants during hot weather
Acinopterus angulatus, a newly discovered leafhopper vector of California aster-yellows virus
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