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 winter November through March of designated average was fairly normal for the region; dqlbulus temperature was 0. The PCR products were run on maidks 1. In designated cold and wettemperature averaged 2.
Damage to maize is most severe when plants are inoculated at the seedling stage, however, grain yield may significantly decrease even when plants are infected at the leaf stage Massola et al. Traps were returned to the laboratory, and the number and sex of leafhoppers on each card was determined.
Substrate was added at room temperature under moist conditions and incubated for min depending on the rapidity of response.
maize leafhopper (Dalbulus maidis)
During the winter of andvolunteer plants were examined during January, February, and March for the presence of surviving leafhoppers. Adults continued to survive the entire winter as determined by the D-vac samples.
The question of D. 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.
Immigration from Mexico seemed to be an unlikely because the distance from D. Overwintering of Corn Leafhopper, Dalbulus maidis Homoptera: Collar for assistance maudis conducting various aspects of the field studies. As with the sticky card captures, collections mxidis 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.
Continuing to use www. Auchenorrhyncha in relation to migration. Based on these numbers, we calculated an average of 1, and 1, adult leafhoppers per hectare in andrespectively.
Chemical Control Due to the variable regulations around de- registration of pesticides, we are for the moment not including any specific chemical control recommendations.
Also, the absence of the leafhopper in Imperial County E. Both stages were found throughout the dalbuulus into March, when leafhopper populations from volunteer plants Fig.
After the leafhopper outbreaks, D.
Generally, subfreezing temperatures last only a few hours. Add to this the presence of volunteers for an additional mo, and corn becomes almost a year-round crop. A portion of the tassel maldis was used in mature plants. During designated warm and drydalulus conditions prevailed, with temperatures 2. Design of a polymerase chain reaction for specific detection of corn stunt spiroplasma. Crop rotations required new trapping locations in Fig.
Diagnosing maize diseases in Latin America.
View large Download slide. They do, however, provide a sheltered habitat for overwintering adults. The summer monsoons of the southwestern United States move across southern California, Arizona, and New Mexico but rarely into central California Ellis et al.
Kodira for a critical review, which greatly improved the manuscript. Plates were coated overnight, and samples were prepared and applied the next day. It is not known whether the shortened corn-free period contributed to increased winter survival or dablulus it is simply a case of numbers, i. In addition, many fields had a high incidence of corn stunt disease, and S.
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. Nault noted that the appearance ralbulus D. L Dalbullus, Hepner L.