Abstract. A 3-yr study was conducted in California’s southern San Joaquin Valley to determine the overwintering survival of the corn leafhopper, Dalbulus maidis. The corn leafhopper, Dalbulus maidis (Delong and Wolcott) is found only in subtropical and tropical areas of America. Its host range is limited to maize and its . The corn leafhopper, Dalbulus maidis (DeLong & Wolcott) (Hemiptera: Cicadellidae), is one of the most important pests of corn, Zea mays L. (Poaceae), in Latin.
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Citing articles via Web of Science Antibodies were made in rabbits using a CSS corn stunt spiroplasma -purified antigen dalgulus a standard alkaline phosphatase conjugate enzyme system. Based on five separate observations, 20 and 16 adult leafhoppers were found in andrespectively. Overwintering leafhoppers easily acquire the spiroplasma in the spring and transmit it to newly planted corn. Corn leafhopper populations were sampled from November to March using yellow sticky cards, D-vac suction samples, and inspection of volunteer corn plants and spring planted corn.
Until this study, nothing was known regarding the overwintering of either the leafhopper or the spiroplasma. The mild winter of resulted in the survival of large numbers of volunteer corn plants throughout the entire winter. Vernon provided information on corn acreage in Tulare and Kings Counties. Hence, we re-describe the sperm morphology of this species using light microscopy maivis transmission electron microscopy.
Incaptures on yellow sticky cards were less frequent Fig. Apparently, damage was due solely to leafhopper feeding, because no evidence of corn stunt disease was reported. The corn leafhopper was first reported causing injury to field corn in Fresno and Tulare counties in Frazier Infected leafhoppers were recovered throughout the winter and spring in all 3 yr.
It is not known whether the shortened corn-free period contributed to increased winter survival or if it is simply a case of numbers, i. Knowledge Bank home Change location. However, collections beginning in early March were similar to those of previous years.
In addition to yield losses caused by feeding injury Bushing and Burtoncorn leafhopper is a vector of corn stunt spiroplasma CSSSpiroplasma kunkelii Whitcomb et al. Annual movement of Dalbulus maidis into the southern United States and its role as vector of the corn stunt virus.
Mollicutes in midgut and mallpighian tubules of the leafhopper Dalbulus maidis. Plants were watered as necessary. Traps were returned to the laboratory, and the number maiis sex of leafhoppers on each card was determined. In two separate situations, suspected S.
Continuing to use www. Corn and teosinte, Zea spp.
Auchenorrhyncha in relation to migration. In all the spermatozoa observed, the final portion of the flagellum was branched into four filaments.
Influence of developmental conditions on cold-hardiness of adult Dalbulus leafhoppers: Generally, subfreezing temperatures last only a few hours. Temperatures in the SJV generally begin a downward trend during September through November, well maudis advance of freezing conditions, allowing ample time for adults to become preconditioned to colder temperatures.
maize leafhopper (Dalbulus maidis)
Biological studies on the corn leafhopper Dalbulus maidis Insecta-Cicadellidae in Tucuman, Argentina. In4 of 35 plants observed to contain an adult leafhopper were positive for the presence of S. Infected plants were found among the sentinel plants placed in the field in January through April.
Adults continued to survive the entire winter as determined by the D-vac samples. The question of D. The winter November through March of designated average was fairly normal maidix the region; mean temperature was 0. Our findings that females overwinter in substantially higher numbers than do males agree with those of Larsen et al. Commercially planted corn in grower fields was also examined for the presence of leafhoppers and tested for the occurrence of the spiroplasma.
As soon as the soil begins to warm in the spring, usually by early February, germination begins again, and seedling corn may be present in mid-February. Sign In or Create an Account. They were also regularly recovered from alfalfa, Medicago sativa L.