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  • 1
    Language: English
    In: Archives of Phytopathology and Plant Protection, 01 July 2012, Vol.45(12), pp.1499-1500
    Description: Archives Of Phytopathology And Plant Protection Professor Dr. Theo Wetzel celebrates his 80th birthday
    Keywords: Agriculture
    ISSN: 0323-5408
    E-ISSN: 1477-2906
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  • 2
    Language: English
    In: Gesunde Pflanzen, 2011, Vol.63(4), pp.159-165
    Description: Effects of temperature, rainfall and solar radiation on frit fly ( Oscinella frit ) population and infestation level were evaluated in two wheat varieties in central Germany during 2008–2010. The effect colour of water traps (blue, white and yellow) -used in population determination- on their efficiency was also evaluated. Strong correlation was found between weather parameters and trap catches (R 2 between 0.8 and 0.98). Infestation percents were calculated by counting the infested plants at different growth stages 10–30. The weather conditions in 2008 and 2009 were drier, warmer and sunnier than 2010, which affected trap catches as well infestation percents. There was a positive correlation between blue trap catches and solar radiation and negative correlation with white and yellow traps. Infestation percents were higher in 2008 & 2009 than in 2010; although trap catches were higher in 2010 than 2008 & 2009, because weather conditions affected adult negatively ovipositon and newly larvae survival in 2010. The results indicate that weather can play a precise role in frit fly activity and its infestation levels. In einem dreijährigen Parzellenversuch am Standort Halle (Saale) wurde der Einfluss von Witterungsbedingungen (Temperatur, Niederschlag und Globalstrahlung) auf die Aktivität und das Schadausmaß der Fritfliege untersucht. Zur Überwachung der Aktivität kamen Farbschalen (blau, weiß und gelb) zum Einsatz und der Infektionsgrad wurde mittels Sichtbonituren zu unterschiedlichen BBCH-Stadien ermittelt. Die Witterungsbedingungen beeinflussten die Aktivität und das Infektionsniveau. Es bestand eine positive Korrelation zwischen den Blauschalenfängen und der Globalstrahlung und die Fänge in den Weiß- und Gelbschalen zeigten einen negativen Zusammenhang. Die Schädigung der Pflanzen (%) war 2008 und 2009 höher als 2010, offensichtlich beeinflussten die ungünstigen abiotischen Bedingungen 2010 das Befallsgeschehen negativ. Die dreijährigen Befunde zeigen, dass die Wetterbedingungen im Frühjahr zu BBCH 10–20 entscheidend sind für die Ausprägung des Schadausmaßes an Sommerweizen.
    Keywords: infestation ; Wheat ; Temperature ; Rainfall ; Solar radiation ; Water traps
    ISSN: 0367-4223
    E-ISSN: 1439-0345
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  • 3
    Language: English
    In: Gesunde Pflanzen, 2011, Vol.63(1), pp.49-49
    Description: The intensity of thrips and wheat blossom midges (WBM) infestations in twelve wheat cultivars was evaluated at the Plant Breeding Station, Silstedt, central Germany in 2008 & 2009 growing crop seasons. The research aimed at selecting the least infested cultivar to be profitably used in the forthcoming cultivation. Infestation levels were studied in flowering and milky stages (GS 65 and 73) of each cultivar in every single-spikelet in sample of 10 ears in both years.
    Keywords: Agriculture;
    ISSN: 0367-4223
    E-ISSN: 1439-0345
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  • 4
    Language: English
    In: Gesunde Pflanzen, 2011, Vol.62(3), pp.107-115
    Description: The intensity of thrips and wheat blossom midges (WBM) infestations in twelve wheat cultivars was evaluated at the Plant Breeding Station, Silstedt, central Germany in 2008 & 2009 growing crop seasons. The research aimed at selecting the least infested cultivar to be profitably used in the forthcoming cultivation. Infestation levels were studied in flowering and milky stages (GS 65 and 73) of each cultivar in every single-spikelet in sample of 10 ears in both years. There were significant differences in thrips and (WBM) densities among different cultivars in both years. Thrips numbers were the highest in Türkis, Global and Esket cultivars, while the lowest values were recorded in Robigus, Brompton and Carenius. The results showed that the highest WBM infestation was observed in Türkis, Tommi and Potenzial; on the other hand the lowest WBM infestation was found in some insect resistant cultivars (Brompton, Skalmeje, Robigus, Welford and Glasgow). The infested ears were positively correlated with the numbers of WBM among cultivars. The obtained results would give a good guide for choosing the proper cultivars which proved highly resistant to their specific pests. Die Weizengallmücken (Géhin) und (Kirby) sowie die Thripsarten (Halieus) und (Halieus) zählen zu den wichtigsten Schadinsekten am Getreide. Das mitteldeutsche Trockengebiet wurde durch die Zuchtstation der RAGT 2n Silstedt (12 Sorten) repräsentiert. In der vorliegenden Arbeit wurden in den Jahren 2008 und 2009 in Freilandversuchen untersucht, welchen Einfluss die Koinzidenz (Zusammentreffen der Mücken mit dem sensiblen Entwicklungsstadium des Weizens) auf das Schadausmaß nimmt. Zum Einsatz kam die Methode der Ährenuntersuchung. Der Befall wurde in der Blüte und Milchreife des Getreides (BBCH 65 und 73) untersucht. Von jeder Prüfsorte wurden in jedem Jahr 10 Ähren auf Befall mit Weizengallmückenlarven und Thripsen untersucht. Es zeigten sich signifikante Unterschiede bei den Befallswerten von Weizengallmücken und Thripsen zwischen den Prüfsorten in beiden Jahren. Die Sorten Türkis, Global und Esket waren am stärksten mit Thripsen besiedelt (4.5, 4.3 und 4.1 Thripse/Ähreteil), während die Sorten Robigus und Carenius geringe Befallswerte aufwiesen (2.0 und 1.9 Thripse/Ähreteil). Die Ergebnisse zeigen, dass der höchste Befall mit Weizengallmückenlarven in der Sorte Türkis, (5.3 Larvae/Ähreteil) zu beobachten war. Die niedrigsten Befallswerte zeigten die resistenten Sorten (Brompton, Skalmeje, Robigus, Welford und Glasgow). Die Resultate belegen eine positive Korrelation zwischen den befallenen Ähren und den Zahlen der Weizengallmückenlarven pro Ähre. Im Rahmen dieser Arbeit konnten Sorten ermittelt werden, die geringe Befallswerte zeigen und somit geeignet sind in der landwirtschaftlichen Praxis dazu beizutragen Ertragsverluste zu vermindern und den Einsatz von Pflanzenschutzmitteln auf ein notwendiges Maß zu beschränken.
    Keywords: Winter wheat cultivars ; Insect resistance ; Wheat blossom midge ; Thrips ; Silstedt
    ISSN: 0367-4223
    E-ISSN: 1439-0345
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  • 5
    Language: English
    In: Archives of Phytopathology and Plant Protection, 01 August 2013, Vol.46(13), pp.1523-1532
    Description: Beneficial arthropods and wheat insects were monitored using sticky traps through large-scale field in Saxony, Germany before and after insecticide applications. The tested compounds (Karate, Biscaya and NeemAzal T/S) were sprayed twice at Elongation stage (GS 32) and at the heading stage (GS...
    Keywords: Aphids ; Leafhoppers ; Thrips ; Wasps ; Predators ; Spiders ; Sticky Traps ; Insecticides ; Agriculture
    ISSN: 0323-5408
    E-ISSN: 1477-2906
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  • 6
    Language: English
    In: Agricultural Sciences, 2010-08-01, 1卷2期 (Vol.1, Issue 2), pp.68-75
    Description: Wheat ear insects in large scale winter wheat field in Salzmünde (Saxsony-Anhalt) central Germany were evaluated. The present study aimed at studying the abundance of wheat blossom midges WBM, Sitodoplosis mosellana (Géhin), Contarinia tritici (Kirby) and thrips, Limothrips cerealium (Haliday) and Haplothrips tritici (Kurdjumov). Infestation in winter wheat during the growing seasons 2007, 2008 and 2009 was evaluated. Three methods were used to determine population densities and damage of wheat midges and thrips; pheromone traps, inspection of ear insects and water traps. A strong correlation between midge's catches and weather conditions was obtained in field observations. A positive correlation between pheromone catches and ear infestation levels was recorded; it was higher in 2008 than in 2009. On the other hand, in 2007 there was no synchronization; S. mosellana hibernated emerged too late to coincide with the susceptible wheat growth stages. The chemical treatment applied at 2008 for highly infestation; there were significant differences in thrips and midge numbers between treated and untreated. Thrips and midge numbers were lower in the treated than in control. The high midge populations in water traps were recorded at growth stages 77-79 and 83 and the low populations were recorded at GS 75 and 75-77. This gives a reliable base for decision making to midges control.
    Keywords: Winter Wheat ; Thrips ; Wheat Midges ; Population Densities
    ISSN: 2156-8553
    E-ISSN: 21568561
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  • 7
    Language: English
    In: Journal of Plant Diseases and Protection, 2010, Vol.117(6), pp.261-267
    Description: Susceptibility of spring wheat to infestation with wheat blossom midges (WBM) and thrips was studied in Central Germany in the two seasons, 2008 and 2009. WBM Sitodiplosis mosellana, Contarinia tritici and the thrips species Limothrips denticornis and L. cerealium are among the major pests of wheat ears. Pheromone traps were used for surveying S. mosellana adults. Ear-infestations in the wheat varieties Triso (high quality in Germany) and Sakha 93 (resistant to drought in Egypt) were evaluated by counting insects at flowering stage (GS 65) and the milk-ripe stage (GS 73). Migrating WBM larvae were evaluated using water traps. In the pheromone traps, density of S. mosellana adults started high and then the population steadily declined until the end of the season. There was no significant difference in the total number of thrips and WBM larvae between varieties at GS 65 in either year, while differences between varieties at GS 73 were significant. Thrips and WBM larvae numbers were significantly higher in Triso than Sakha 93 in 2008 and 2009. The infested ears were positively correlated with WBM counts in both varieties. Numbers of migrated yellow midge larvae were higher in 2008, but lower in 2009 than orange midge. Yield was higher in Triso than Sakha 93 in both seasons.
    Keywords: Contarinia tritici ; Limothrips denticornis ; Sitodiplosis mosellana ; thrips ; varieties ; yield
    ISSN: 1861-3829
    E-ISSN: 1861-3837
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  • 8
    Language: English
    In: Journal of pest science, 2011, Vol.84(1), pp.49-59
    Description: Population densities of wheat ear insects infesting different winter wheat varieties (n = 50) were estimated during 2008 and 2009 seasons near Halle, central Germany. The research was aimed at identifying wheat varieties most resistant to wheat ear insect pests. Two methods were used to evaluate the degree of insect infestations in different wheat ear varieties. Wheat ears were dissected when kernels were in Zadoks stage 73 and examined using a binocular microscope to count the number of spikelets and infested kernels, and to identify the insect pests present. In addition, white water traps were placed on the soil underneath each variety to collect mature larvae of wheat blossom midges (WBMs) as an indicator of potential crop risk for the next year. There were significant differences in the number of thrips and WBM infesting wheat ears among varieties in both years. Thrips numbers were the highest in Akratos, Limes and Ritmo varieties in 2008 and in Michigan Amber, Elegant and Kontrast in 2009. Thrips were the lowest in Thuareg in 2008 and Robigus varieties in 2009. The results showed that the highest WBM infestation level was observed in Michigan Amber in both years. The lowest WBM infestations were found in Türkis, Cubus, Capo, Welford and Robigus in both years. The number of infested kernels was positively correlated with WBM among varieties. In the water traps, the highest numbers of WBM larvae were recorded in Saladin and Bussard in 2008 and Orlando, Julius and Glasgow varieties in 2009. The lowest values were recorded in Victo, Enorm, Robigus and Welford varieties in both years. The results provide a guide for selecting winter wheat varieties with resistance to these wheat ear pests. ; Includes references ; p. 49-59.
    Keywords: Pest Management ; Wheat Blossom Midge ; Resistance ; Thrips ; Winter Wheat Varieties
    ISSN: 1612-4758
    E-ISSN: 16124766
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  • 9
    In: Pest Management Science, October 2016, Vol.72(10), pp.1888-1896
    Description: Byline: Maria Tackenberg, Christa Volkmar, Karl-Heinz Dammer Keywords: biomass; camera sensor; fungicide application; leaf area index; precision agriculture; variable-rate spraying Abstract BACKGROUND Currently, no technology for the automatic detection of diseases while moving agricultural equipment through fields is available on the market. An alternative approach of target-oriented fungicide spraying was tested to adapt the local dose rates of spray liquid in winter wheat to local differences in the plant surface and biomass by using a camera sensor. RESULTS A linear correlation was found between the sensor values and two plant parameters, namely the leaf area index and biomass. The spray volume was linearly adapted to the local sensor value in a field trial. The camera sensor was used to operate the dosing system (gauge) at the field boom sprayer. A total of 8% of spray liquid was saved compared with common uniform spraying. CONCLUSIONS Because no differences exist in yield and disease incidence between the sensor-based and uniformly sprayed plot, this new technology, which uses plants as targets for fungicide dosages, could be an alternative to the present common dosage practices on a hectare basis. [c] 2016 Society of Chemical Industry
    Keywords: Biomass ; Camera Sensor ; Fungicide Application ; Leaf Area Index ; Precision Agriculture ; Variable‐Rate Spraying
    ISSN: 1526-498X
    E-ISSN: 1526-4998
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  • 10
    Language: English
    In: Gesunde Pflanzen, 2012, Vol.64(3), pp.141-141
    Keywords: Life Sciences ; Agriculture ; Plant Pathology ; Agriculture;
    ISSN: 0367-4223
    E-ISSN: 1439-0345
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