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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This results in corn being grown for up to 9 mo. Incorn leafhopper populations reached extremely high levels on late-maturing field corn silage and grain and sweet corn in Fresno, Tulare, and Kings counties C. In4 of 35 plants observed to contain an adult leafhopper were positive for the presence of S.

Collar for assistance in conducting various aspects of the field studies. Incaptures on yellow sticky cards were less frequent Fig. Similar conclusions were reached ,aidis Petri maidi al.

maize leafhopper (Dalbulus maidis)

Commercially planted corn in grower fields was also examined for the presence of leafhoppers and tested for the occurrence of the spiroplasma. When testing immature corn, a portion of the mid-rib, found to contain a high titer of spiroplasma, was removed from symptomatic leaves. They were also regularly recovered from alfalfa, Medicago sativa L.

Transmission biology of maize bushy stunt phytoplasma by the corn leafhopper Homoptera: The possible reasons for a shift in the leafhopper from cyclic pest to persistent pest in the region are also discussed. Leafhoppers were collected on yellow sticky cards throughout the makdis during all 3 yr. Control tactics can be directed at the vector, the pathogens, or both.


However, collections beginning in early March were similar to those of previous years.

Florida Entomologist

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. Little information has been published on the control of the corn leafhopper and the corn stunting diseases it transmits. This study encompassed three very different winter conditions. It is evident from the sticky card collections throughout the three winters during which this study was conducted that D. Substrate was added at room temperature under moist conditions and incubated for min depending on the rapidity of response.

In addition, the incidence of corn stunt continued to increase annually as well. Corn stunt disease can result in even more significant yield losses than those attributable to direct leafhopper feeding NaultMoya-Raygoza and Nault Corn and teosinte, Zea spp.

Overwintering leafhoppers easily acquire the spiroplasma in the spring and transmit it to newly planted corn. Diagnosing maize diseases in Latin America.

These volunteers can serve as an early host for leafhoppers who become infective after feeding. Hence, we re-describe the sperm morphology of this species using light microscopy and transmission electron microscopy.

The report by Kloepper et al. L Jr, Hepner L. We found overwintering D. The summer monsoons of the southwestern United States move across southern California, Arizona, and New Mexico but rarely into central California Ellis et al.


Annual movement of Dalbulus maidis into the southern United States and its role as maidiis of the corn stunt virus. Multiplication of corn stunt spiroplasma in Dalbulus maidis and transmission in vitro following injections. Leafhoppers captured on the sticky cards and those collected in D-vac samples were examined for the presence of S. Teosintes do not occur in California, and corn does not usually survive throughout the winter here.

C Casela, R Renfro, A.

EU pesticides database www. Ability of the corn leafhopper to overwinter in California has been the subject of considerable speculation.

Go to distribution map Dalbulus maidiscorn leafhoppercorn stuntSpiroplasma kunkeliispiroplasma. Adult leafhoppers were captured on yellow sticky cards throughout the winter in all 3 yr Fig. The mild winter of resulted in the survival of large numbers of volunteer corn plants throughout the entire winter. However, the description is imprecise, requiring certain rectifications. Although the corn stunt spiroplasma has been found in mustard, Sinapis alba L.

Temperatures in the SJV generally begin a downward trend during September through November, well in advance of freezing conditions, allowing ample time for adults to become preconditioned to colder temperatures. Alivizatosit is not likely that these plants contribute to the overwintering of the mollicute.