Results 151 to 160 of about 227,604 (182)
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CORN STUNT: INVOLVEMENT OF A COMPLEX OF LEAFHOPPER-BORNE PATHOGENS
1979L.R. Nault, O.E. Bradfute
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Intraspecific competition and performance of Anagrus virlai parasitizing the corn leafhopper
Annals of Applied BiologyAbstractIntraspecific competition and avoidance of superparasitism are critical for biological control. In this study, we conducted behavioural and biological trials to assess intraspecific competition in the egg parasitoid Anagrus virlai, targeting the corn leafhopper Dalbulus maidis. Firstly, we investigated whether A.
Jorge G. Hill +4 more
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Maize Response to Corn Leafhopper (Homoptera: Cicadellidae) Infestation and Achaparramiento Disease
Journal of Economic Entomology, 1997To determine the effect that the timing of infestation of Dalbulus maidis (DeLong & Wolcott), a vector of 3 maize pathogens, known collectively as “achaparramiento,” has on stunt symptoms and maize yield, we conducted a field trial in the Sebaco Valley of Central Nicaragua.
Allan J. Hruska, Modesto Gomez Peralta
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Annals of the Entomological Society of America, 1998
Effects of temperature and vector age at the time of acquisition on the transmission of maize bushy stunt phytoplasma by the corn leafhopper, Dalbulus maidis (DeLong & Wolcott), were studied. Mean latent period in the leafhopper and transmission rate of the Tlaltizapan maize bushy stunt phytoplasma isolate had a quadratic relation with temperature ...
Gustavo Moya-Raygoza, Lowell R Nault
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Effects of temperature and vector age at the time of acquisition on the transmission of maize bushy stunt phytoplasma by the corn leafhopper, Dalbulus maidis (DeLong & Wolcott), were studied. Mean latent period in the leafhopper and transmission rate of the Tlaltizapan maize bushy stunt phytoplasma isolate had a quadratic relation with temperature ...
Gustavo Moya-Raygoza, Lowell R Nault
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Corn Stunt Spiroplasma in the Leafhopper Euscelidius variegatus
Journal of Phytopathology, 1987AbstractCorn stunt spiroplasma (CSS) multiplied in all leafhoppers Euscelidius variegatus injected with a culture of CSS, reaching titres of over 1x106 colony forming units (cfu) per insect and 2x104 cfu per salivary gland of each insect. CSS could be isolated from the haemolymph and the salivary glands at any time after injection. The growth of CSS in
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Journal of Economic Entomology, 1986
Aspects of field biology of the blackfaced leafhopper, Graminella nigrifrons (Forbes), were examined in conventional and no-tillage corn and pastures. Peak G. nigrifrons density was significantly higher in no-tillage than conventional tillage corn in early June 1981. In 1982, peak density in conventional tillage corn occurred in late May.
John D. Sedlacek, Paul H. Freytag
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Aspects of field biology of the blackfaced leafhopper, Graminella nigrifrons (Forbes), were examined in conventional and no-tillage corn and pastures. Peak G. nigrifrons density was significantly higher in no-tillage than conventional tillage corn in early June 1981. In 1982, peak density in conventional tillage corn occurred in late May.
John D. Sedlacek, Paul H. Freytag
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Environmental Entomology, 1986
Laboratory life tables were constructed for Graminella nigrifrons (Forbes) using Johnsongrass and corn as hosts. Daily mortality and fecundity schedules were established to estimate net reproductive rate and instantaneous rate of population increase on each host. Nymphal mortality on Johnsongrass was greatest in the fifth instar.
John D. Sedlacek +2 more
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Laboratory life tables were constructed for Graminella nigrifrons (Forbes) using Johnsongrass and corn as hosts. Daily mortality and fecundity schedules were established to estimate net reproductive rate and instantaneous rate of population increase on each host. Nymphal mortality on Johnsongrass was greatest in the fifth instar.
John D. Sedlacek +2 more
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Morinda citrifolia essential oil in corn leafhopper control and phytotoxic effect
2023O elevado valor socioeconômico do milho (Zea mays L.) e a necessidade de aumento da produtividade impulsionaram o crescimento das áreas cultiváveis, o que tem gerado grandes desafios no controle fitossanitário das lavouras. O complexo de enfezamento, transmitida pela cigarrinha do milho (Dalbulus maidis) é responsável por perdas significativas de ...
Oliveira Guilherme, Eduardo +3 more
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Field Corn, Blackfaced Leafhopper and Maize Chlorotic Dwarf Disease Control, 1978
Insecticide and Acaricide Tests, 1979Abstract Dekalb 1214 was planted on May 11 near Godfrey, Ga. and on May 30 near Calhoun, Ga. Soil type was sandy-clay-loam at both locations. Two 0.5 acre blocks were planted in each location with a 36 and 38-inch row width at Godfrey and Calhoun, respectively.
J. N. All, D. R. Alverson
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Antonie van Leeuwenhoek
Chromobacterium subtsugae is the only species in this genus exploited for biological pest control. In this study, we demonstrated the insecticidal properties of Chromobacterium piscinae ESALQ6200 against Dalbulus maidis, even at low concentrations, using treatments with only bacterial cells and cell-free filtered supernatant containing secreted ...
Natasha Sant Anna, Iwanicki +3 more
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Chromobacterium subtsugae is the only species in this genus exploited for biological pest control. In this study, we demonstrated the insecticidal properties of Chromobacterium piscinae ESALQ6200 against Dalbulus maidis, even at low concentrations, using treatments with only bacterial cells and cell-free filtered supernatant containing secreted ...
Natasha Sant Anna, Iwanicki +3 more
openaire +2 more sources