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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The plate wells were initially scored visually as they developed, and later, after fixing, the enzyme reaction was read with a plate reader E-max ; Molecular Devices, Sunnyvale, CA at nm. This paper reports the results of studies conducted to determine the overwintering capabilities of D.

The leafhoppers and planthoppers. Knowledge Bank home Change location. To produce an increased amount of silage, plantings are established earlier March and later August or September than before. 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 dalbulsu where maize is grown throughout the year, with irrigation during the dry season.

Maize response to corn leafhopper Homoptera: Adult leafhoppers were captured on yellow sticky cards throughout the winter in all 3 yr Fig.

maize leafhopper (Dalbulus maidis)

Corn leafhopper reappeared inand corn stunt was apparently present in at least some fields Kloepper et al. Evolutionary relationship between maize leafhoppers and their host plants. Overwintering biology of Dalbulus leafhoppers Homoptera: In actuality, the host-free period is much shorter in most years because volunteer corn plants, arising from seeds remaining in the field after harvest, appear after the first fall rains or an irrigation.


Crop rotations maiddis new trapping locations in Fig. Because there are no overwintering hosts for D. In cross-section, it has a thumbtack shape, except in the anterior and posterior regions, where it is oval. Transmission biology of maize bushy stunt phytoplasma by the corn leafhopper Homoptera: After the leafhopper outbreaks, D.

Overwintering of Corn Leafhopper, Dalbulus maidis Homoptera: Corn leafhopper overwintering biology was never investigated. View large Download slide. Beginning in October or November, the sticky cards were placed adjacent to corn fields in Fresno, Kings, and Tulare Counties that had high numbers of corn leafhopper during the previous summer, next to alfalfa fields, and in riparian areas next to fields previously planted to corn.

At the end of 2 wk, plants were transported to the laboratory and placed in the greenhouse, and new potted corn plants were dalulus in the field. A portion of the tassel rachis was used in mature plants.

In a Mediterranean climate such as California, diapause or hibernation is not essential for surviving the mild winters.

Spiroplasma kunkelii new-species characterization of the etiological agent of corn stunt disease. Currently in California, of the three entities, only S.

Continuing to use www. Damage caused directly by D.

Close Find out more. Leafhopper vectors and plant disease agents. Double-sided yellow sticky cards, 7. We found maidus D. This study amidis three very different winter conditions. However, the description is imprecise, requiring certain rectifications.

At least one, if not all three, of these pathogens have been reported present wherever the corn leafhopper is found. Auchenorrhyncha in relation to migration. The number of hectares of corn grown for silage in the two counties increased from 18, in to 76, inmore than a 4-fold increase Kings and Tulare County Agricultural Daobulus and Livestock Reports 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.


Antibodies were made in rabbits using a CSS corn stunt spiroplasma -purified antigen and a standard alkaline phosphatase conjugate enzyme system.

Florida Entomologist

EU pesticides database www. Natwick, personal communication dqlbulus, despite that county’s large acreage of sweet corn, which is just across the border from Mexico. 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.

Cicadellidae infestation and achaparramiento disease. 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. Purcell concluded that regular spring migrations from Mexico might explain the reappearance of D.

However, the leafhopper is a significant pest as a vector of three stunting pathogens: The nucleus, which is linear and thin, measured from Adults were consistently collected from both alfalfa and weedy areas throughout the winter Fig. Areas adjacent to heavily infested corn fields were sampled beginning in October or November using a D-vac suction machine Rincon-Vitova, Ventura, CA with a 0.

Both stages were found throughout the winter into March, when leafhopper populations from volunteer plants Fig. During designated warm and drywarmer conditions prevailed, with temperatures 2. Plants were cut at ground level, transported to the laboratory where they were chilled to slow leafhopper movement, and examined for the presence of adults and nymphs.

Nymphs failed to survive the entire winter dwlbulus and were not recovered in March when new corn was being planted.