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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Adults were consistently collected from both maicis and weedy areas throughout the winter Fig. Thus, the period of time when corn is not available may be as little as 2 mo. Close mobile search navigation Article navigation. Corn leafhopper populations maaidis sampled from November to March using yellow sticky cards, D-vac suction samples, and inspection of volunteer corn plants and spring planted corn.
To produce an increased amount of silage, plantings are established earlier March and later August or September than before. C Casela, R Renfro, A.
Mollicutes in midgut and mallpighian tubules of the leafhopper Dalbulus maidis. Ebbert and Nault also found that S.
These volunteer plants are present until the first killing frost, which, in some years, may not occur until late December or not at all. The corn leafhopper, Dalbulus maidis, which is one of the most important vectors of maize diseases, had the morphology of its spermatozoa described more than 40 years ago.
Antibodies were made in rabbits using a CSS corn stunt spiroplasma -purified antigen and a standard alkaline phosphatase conjugate enzyme system. Experimental analysis of flight activity of three Dalbulus leafhoppers Homoptera: Areas suspected of harboring leafhoppers, including weedy fields, ditch and fence lines, alfalfa Medicago sativa L.
D-vac suctions proved a reliable technique for recovering leafhoppers. We have no evidence that any of these plants serve as feeding hosts for the leafhopper.
maize leafhopper (Dalbulus maidis)
Adults continued to survive the entire winter as determined by the D-vac samples. For further information, we recommend you visit the following resources: 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.
Teosintes do not occur in California, and corn does not usually survive throughout the winter here. Differential pathogenicity of corn stunt spiroplasma to its Dalbulus leafhopper vectors: Maize response to corn leafhopper Homoptera: All three stunting pathogens are persistently transmitted by the corn leafhopper; once an insect becomes a vector, it transmits for life.
Close Find out more. Chemical Control Due to the variable regulations around de- registration of pesticides, we are for the moment not including any specific chemical control recommendations. The tissue was macerated on a laboratory bench using a large-faced brass mallet, a small amount of general extract buffer, pH 7.
Control tactics can be directed at the vector, the pathogens, or both. Little information has been published on the control of the corn leafhopper and the corn stunting diseases it transmits. In the early season, the PCR product of the reaction was used in a second reaction, and distinct bands were observed. The PCR products were run on a 1. Leafhoppers appeared earlier each year, and bythey commonly were found in March and April. Immigration from Mexico seemed to be an unlikely because the distance from D.
When testing immature corn, a portion of the mid-rib, found to contain a high titer of spiroplasma, was removed from symptomatic leaves. The corn leafhopper was first reported causing injury to field corn in Fresno and Tulare counties in Frazier At least one, if not all three, of these pathogens have been reported present wherever the corn leafhopper is found.
At this point, we suspected that D. 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. Dalbulus maidis does not enter diapause or another state of dormancy during the Mexican winter Dalbbulus et al. Infected leafhoppers were recovered throughout the winter and spring in all 3 yr.
Dalgulus plants with MBSP-like symptoms have been observed, recent maicis to recover this pathogen have been unsuccessful C. The head region is formed by a small acrosome and the nucleus.
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. Transmission biology of maize bushy stunt phytoplasma by the maaidis leafhopper Homoptera: The amounts of reagents used in the preparation were determined by the number of leafhoppers in the sample.