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A Waterhemp (Amaranthus tuberculatus) Population Resistant to 2,4-D
Herbicide resistance auxinic herbicides growth regulator herbicides
2015/12/21
A waterhemp population from a native-grass seed production field in Nebraska was no longer effectively controlled by 2,4-D. Seed was collected from the site, and dose-response studies were conducted t...
Distribution and population structure of the chestnut blight fungus in Romania
Cryphonectria parasitica European chestnut oak hypovirus vc types mating types
2015/7/28
The occurrence of chestnut blight (Cryphonectria parasitica) was studied in 2011–2012 at 13 locations in the main chestnut growing areas of Romania. Infections were detected at four localities. The sy...
Changes in virulence frequencies and higher fitness of simple pathotypes in the Czech population of Blumeria graminis f.sp. hordei
barley powdery mildew Hordeum vulgare population diversity specific resistances unnecessary virulences
2015/7/28
The employment of specific genes, which determine host resistance to avirulent pathotypes of the pathogen, is not recommended for protecting barley against powdery mildew (Blumeria graminis f.sp. hord...
Changes in the Population of Blumeria graminis f.sp. hordei in the Czech Republic from 2009 to 2010
barley Hordeum vulgare L. powdery mildew resistances
2015/3/6
Virulences to powdery mildew resistances in barley cultivars mostly carrying unknown resistances were determined in 2009 and 2010. Random spore samples of the airborne pathogen populations originating...
Genetic diversity of Cryphonectria parasitica population in the Štiavnicko-krupinská subpopulation in Slovakia
chestnut blight Cryphonectria parasitica vc group Castanea sativa
2015/2/6
The structure of C. parasitica populations was evaluated in Štiavnicko-krupinská subpopulation in Slovakia. A total of four vegetative-compatibility (vc) types were detected among the sample of 2...
Population dynamics of Chaetocnema tibialis Illiger and Phyllotreta vittula (Redtenbacher) on the weed Amaranthus retroflexus L. and cultivated Amaranthus caudatus L.
Amaranthus flea beetles Chaetocnema Phyllotreta
2015/2/6
In 1995–1997, the population dynamics of the flea beetles Chaetocnema tibialis and Phyllotreta vittula, associated with Amaranthus retroflexus (wild species) and Amaranthus caudatus (cultivated specie...
Comparison of Field Population Growths of Three Cereal Aphid Species on Winter Wheat
Metopolophium dirhodum Rhopalosiphum padi Sitobion avenae population dynamic pest monitoring winter wheat
2015/1/30
Population growths of three aphid species colonising winter wheat stands, Metopolophium dirhodum, Rhopalosiphum padi and Sitobion avenae, were analysed by regression method. The calculations were base...
Monitoring the population dynamics of the horse chestnut leafminer Cameraria ohridella with a synthetic pheromone in Europe
horse chestnut leafminer Cameraria ohridella Lepidoptera Gracillariidae female sex pheromone traps monitoring population density
2015/1/28
A monitoring system for Cameraria ohridella males based on a synthetic sex pheromone was tested in the Czech Republic, Germany, France and Greece. From the obtained data on the insect phenology we con...
The virulence spectrum of the wheat leaf rust population analyzed in the Czech Republic from 2002 to 2011
leaf rust pathotypes Lr genes resistance wheat
2014/12/1
The research report presents a summary of wheat leaf rust virulence surveys in the Czech Republic from 2002 to 2011. Determination of virulence was based on infection types on Thatcher near-isogenic l...
VARIETAL RESISTANCE AGAINST JASSID, AMRASCA DEVASTANS DIST. IN COTTON AND ROLE OF ABIOTIC FACTORS IN POPULATION FLUCTUATION
Gossypium hirsutum genotypes Amrasca pest resistance Pakistan
2009/9/30
Seven genotypes of cotton viz. BH-124, BH-121, BH-125, BH-147, SLH-257, SLH-244
and NIAB-98 were studied for resistance/susceptibility against jassid (Amrasca
devastans Dist.) during 2002. BH-125 sh...
ABIOTIC FACTORS EFFECT ON POPULATION FLUCTUATION OF ALATE APHIDS IN WHEAT
Triticum aestivum aphids population density temperature relative humidity Pakistan
2009/9/29
These studies were conducted at Daphar (Mandi Baha-ud-Din) and Bahawalpur
during 1997-2005 and at Ayub Agricultural Research Institute, Faisalabad, Pakistan
during 1999-2005 to determine the role of...
Population ecology and cultural control of Digitaria ciliaris in soybean
Digitaria ciliaris annual weed seed bank cover crop soybean
2009/3/10
Population ecology and cultural control of Digitaria ciliaris in soybean.
Investigations on Natural Enemies, Some Biological Characteristics and Population Fluctuations of Lepidosaphes ulmi（L.）（Homoptera, Coccidae）Harmful
Natural Enemies Some Biological Characteristics Population Fluctuations
2009/1/16
This study was carried out from 1991 to 1993, in Van province (Erciş, Edremit, Gevaş), which aimed to find out the population fluctations, some biological characteristics and natural enemie...
Population Densities of Liriomyza huidobrensis（Blanchard, 1926）（Diptera：Agromyzidae）in Insecticide-Treated and Non-Treated Cucumber Producing Greenhouses in the İzmir Region
Liriomyza huidobrensis population density insecticide-treated and non-treated cucumber Turkey
2009/1/13
Liriomyza huidobrensis (Blanchard) (Diptera: Agromyzidae) is an important pest in cucumber greenhouses in Çamönü (Menderes, İzmir), Turkey. This study was carried out during the sprin...
Evaluation of Some Selected Pesticides Against the Two Pod Borers Helicoverpa Armigera and Etiella Zinckenella Population Infesting Cowpea in the Newly Reclaimed Regions
Safe insecticides Cowpea bod borer Helicoverpa armigera Etiella zinckenella
2010/11/9
The two pod borers Helicoverpa armigera Hubner and Etiella zinckenella Treitschke are the most
destructive insect pests which infest several crops of leguminosae in Egypt. Field experiments wer condu...