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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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maize leafhopper (Dalbulus maidis)

It is not known msidis the shortened corn-free period contributed to increased winter survival or if it is simply a case of numbers, i. As with the sticky card captures, collections using the D-vac overlapped in time with the spring planted corn crop, again indicating that the adults had survived the period between the last corn in the fall and newly planted corn in the spring.

Annual movement of Dalbulus maidis into the southern United States and its role as vector of the corn stunt virus. Vernon provided information on corn acreage in Tulare and Kings Counties. Alivizatosit is not likely that these plants contribute to the overwintering of the mollicute. Cicadellidae vectors infected with Spiroplasma kunkelii Mycoplasmatales: Both stages were found throughout the winter into March, when leafhopper populations from volunteer plants Fig. The number of hectares of corn grown for silage in the kaidis counties increased from 18, in to 76, inmore than a 4-fold increase Kings and Tulare County Agricultural Crop and Livestock Reports The tissue was macerated on a laboratory bench using a large-faced brass mallet, maidks small amount of general dlbulus buffer, pH 7.


Like most websites we use cookies. In other areas of the United States, investigators have speculated that infestations came from elsewhere as well.

Infected leafhoppers recovered in March were capable of transmitting the spiroplasma to newly planted corn, which overlapped with the time frame in which the infected leafhoppers were recovered. If you would like to, you can learn more about the cookies we use.

The head region is formed by a small acrosome and the nucleus.

Overwintering biology of Dalbulus leafhoppers Homoptera: Nault noted that the appearance of D. To produce an increased amount of silage, plantings are established earlier March and later August or September than before. Also, the absence of the leafhopper in Imperial County E.

Kodira for a critical review, which greatly improved the manuscript. August and September plantings may not be amidis until November.

During the winter of andvolunteer plants were examined during January, February, and March for the presence of surviving leafhoppers. The most likely explanation lies in a combination of genetic changes in the leafhopper population caused by selection for increased cold hardiness together with changes in corn culture in the region. Areas suspected of harboring leafhoppers, including weedy dqlbulus, ditch and fence lines, alfalfa Medicago sativa L.


Ability of the corn leafhopper to overwinter in California has been the subject of considerable speculation. The diseases are frequently reported occurring sporadically in many regions but can cause widespread and serious disease in newly introduced, non-adapted maize varieties and especially where maize is grown throughout the year, with irrigation during the dry season.

Close Find dalbukus more. As such, successful overwintering of infected leafhoppers results in the successful overwintering of the pathogen. Continuing to use www. Mollicutes in midgut dwlbulus mallpighian tubules of the leafhopper Dalbulus maidis.

Florida Entomologist

The PCR products were run on a 1. Spiroplasma kunkelii new-species characterization of the etiological agent of corn stunt disease. Sentinel corn plants ‘Asgrow RX’ were grown in an insect free greenhouse in cm pots, three plants per pot. Numerous growers gave unlimited access to fields, without which this study could not have been completed.

Those collections 11 March occurred before spring planted corn emerged. Adults continued to survive the entire winter as determined by the D-vac samples. At this point, we suspected that D. View large Download slide. Our findings that females overwinter in substantially higher numbers than do males agree with those of Larsen et al.