Plant Protection Science, 2005 (vol. 41), issue 1
Reaction of selected winter wheat varieties to autumnal infection with Wheat dwarf virus
Lenka Širlová, Josef Vacke, Michala Chaloupková
Plant Protect. Sci., 2005, 41(1):1-7 | DOI: 10.17221/2732-PPS 
The response of 25 registered winter wheat varieties to autumnal infection with Wheat dwarf virus (WDV) was studied in small plot trials in two years. The materials were infected by vectors, leafhopper Psammotettix alienus Dahlbom, 1851 from three-leaf stage to tillering. The symptoms expression was monitored in spring and plant height, weight of above ground biomass and grain yield were observed in summer. All tested varieties were evaluated as susceptible and divided into three groups: varieties Banquet and Svitava with 87.3-93.1% grain yield reduction as moderately susceptible, varieties Clever, Drifter, Niagara and Rialto with 95.6-97.68% grain...
Determination of seasonal activity of the sweetpotato whitefly (Homoptera: Aleyrodidae) and leafhoppers (Homoptera: Cicadellidae) by plastic cup traps on the Çukurova Plain, Turkey.
Kamil Karut, Chang-Chi Chu, Thomas J. Henneberry, Cengiz Kazak
Plant Protect. Sci., 2005, 41(1):8-13 | DOI: 10.17221/2735-PPS
The flight activities of adult sweetpotato whitefly, Bemisia tabaci, and leafhoppers were monitored by plastic cup traps at Boğali, Taşçi, Haciali, Doğankent and Balcali in the Çukurova Plain, Turkey, in 2001 and 2003. Activity of B. tabaci, expressed as numbers of adults caught in traps, was low from May to early July in both years. Numbers of B. tabaci caught at Tasçi were higher than at Boğali from 10 July and 21 August in 2001. Its numbers were also higher at Doğankent than at Haciali and Balcali during August of 2003. The numbers of leafhopper adults caught fluctuated greatly in both years. Numbers remained low until late...
Field evaluation of extracts of five Nigerian spices for control of post-flowering insect pests of cowpea, Vigna unguiculata (L.) Walp.
Alphonsus Mbonu Oparaeke, Michael Chidozie Dike, Christopher Iheanyi Amatobi
Plant Protect. Sci., 2005, 41(1):14-20 | DOI: 10.17221/2737-PPS
The insecticidal efficacy of aqueous extracts of five Nigerian spices (Piper guineense Schum and Thonn., Aframomum melegueta (Roscoe), Xylopia aethiopica (Dunal) A. Rich., Zingiber officinale L. and Capsicum annuum L.) was tested in a field study for the control of two important post-flowering insect pests, Maruca vitrata Fab. (Lepidoptera: Pyralidae) and Clavigralla tomentosicollis Stal. (Hemiptera: Coreidae) of cowpea. The extracts were applied at 10% (w/v) and sprayed every week for 4 weeks. P. guineense, followed by A. melegueta, significantly reduced (P < 0.01) abundance of the pests and decreased the damage to cowpea pods. Grain yields were...
Insect injury and mortality of seedlings of field penny-cress (Thlaspi arvense L.).
Jindra Štolcová
Plant Protect. Sci., 2005, 41(1):21-26 | DOI: 10.17221/2736-PPS
During 1997-1999 the injury caused by insect herbivors and mortality of plants of field penny-cress (Thlaspi arvense L.) was studied on an early fallow field at Prague-Ruzyně. The highest abundance of the weed (102 plants per m2) was recorded in 1999, the lowest (27 plants/m2) in 1998. Nearly all plants (100% in 1997 and 1998, 94% in 1999) were injured by flea beetles (Phyllotreta spp.). Injury was greatest (> 50%) in younger seedlings. Mortality was low in 1997 (17.1%) and 1999 (15.8%), but high in 1998 (94%) because of concurrent drought. Herbivory and drought may kill a large proportion of seedlings and thus change the composition of the weed...
Occurrence of fruit doubles in the 2004 season associated with heat and drought stress in previous year - New and Unusual Report
Václav Kůdela, Václav Krejzar
Plant Protect. Sci., 2005, 41(1):27-32 | DOI: 10.17221/2734-PPS
A higher than normal incidence of fruit doubles occurred in the Czech Republic in the 2004 season. Fruit doubles or twinning was most frequently observed among plum fruits sold in town markets, in mirabelle in small gardens in Prague and environs, and in apple, variety James Grieve, on the experimental plots of the Research Institute of Crop Production, Prague-Ruzyně. In other cases, only the terminal fruits were fully developed, usually in one apple spur, while basal fruits were retarded. Based on meteorological data and literature reports, it can be concluded that the higher incidence of fruit doubles in the CR in 2004 is correlated with heat and...
First report of Pseudomonas savastanoi pv. nerii on oleander in the Czech Republic
Václav Kůdela, Ivana Šafránková, Václav Krejzar, Josef Korba
Plant Protect. Sci., 2005, 41(1):33-37 | DOI: 10.17221/2733-PPS
The bacterium Pseudomonas savastanoi pv. nerii was identified as the causal agent of parenchymatous galls on leaves of potted oleander plants grown at Brno, Moravia, in 2004. The plants had originated from cuttings made from firm shoots of a supposedly asymptomatic plant grown in and introduced from the Mediterranean region. The Biolog GN microplate system was used to identify the isolated bacterial strains. Successful inoculation of Nerium oleander seedlings proved the pathogenicity of the isolates. This is the first record of P. savastanoi pv. nerii in the Czech Republic. :
First records of the rhododendron leafhopper (Graphocephala fennahi) (Hemiptera: Auchenorrhyncha: Cicadellidae) from the Czech Republic
Pavel Špryňar
Plant Protect. Sci., 2005, 41(1):38-41 | DOI: 10.17221/2731-PPS
In summer and autumn of 2004 the cicadellid leafhopper species Graphocephala fennahi was detected in the Czech Republic for the first time as a new alien insect species feeding on Rhododendron. The species is native to North America and was introduced in the 1930's to Great Britain and in the 1970's to continental Europe, where its invasion and relationship to the rhododendron bud blast disease have been studied in detail. At present, the Czech populations of G. fennahi appear to be restricted to the Prague city area and near surroundings, but further spread of G. fennahi can be expected.
Trogoderma longisetosum and Trogoderma variabile (Coleoptera, Dermestidae) as two new stored product pests for the Czech Republic
Václav Stejskal, Zuzana Kučerová, Jiří Háva
Plant Protect. Sci., 2005, 41(1):42-45 | DOI: 10.17221/2738-PPS
A revision of material from the stored product pest collection of the Research Institute of Crop Production, Prague, was carried out. While so far five species of Trogoderma (all synanthropic) have been known from the Czech Republic, the revision revealed two new species and two new stored product pests for the Czech Republic: T. longisetosum and T. variabile. A key to determine T. longisetosum and T. glabrum is given. Faunistic records of the former quarantine species T. granarium are listed.