Plant Protection Science, 2008 (vol. 44), issue 3
Electron microscopy of structures present in embryonic cells of plants infected with Plum pox virus
Jaroslav Polák, Milan Jokeš, Miloslava Ducháčová, Alena Hauptmanová, Petr Komínek
Plant Protect. Sci., 2008, 44(3):81-84 | DOI: 10.17221/28/2008-PPS 
Electron microscopy was used to detect the presence of virus particles or inclusions in growth tips and parenchymatic cells of leaves of plum, apricot and peach trees artificially infected with Plum pox virus (PPV). Typical pinwheels were found in ultrathin sections of leaves of PPV infected plums, apricots and peaches. Filamentous particles or their aggregates approximately 750 nm long were found in ultrathin sections of growth tips of plum, apricot, and peach shoots with a diameter of 0.5 mm. Pinwheels were never present in embryonic cells. No virus particles were found in ultrathin sections of growth tips of PPV infected plum, apricot and...
Pseudomonas marginalis associated with soft rot of Zantedeschia spp.
Václav Krejzar, Josef Mertelík, Iveta Pánková, Kateřina Kloudová, Václav Kůdela
Plant Protect. Sci., 2008, 44(3):85-90 | DOI: 10.17221/16/2008-PPS
For the first time in the Czech Republic, bacteria identified as Pseudomonas marginalis, Pectobacterium carotovorum subsp. carotovorum and Pseudomonas putida were isolated from tubers of Zantedeschia spp. with symptoms of tuber soft rot. The symptoms occurred on mother tubers as well as on new daughter tubers of different calla lily hybrids with yellow spathe, calla lily cv. Mango with bright orange spathe and Zantedeschia rehmanii with pink spathe. The percentage of diseased plants of the total plants in the plot was around 10%. When inoculated into potato tuber slices, strains of P. marginalis...
Resistance of apple varieties and selections to Erwinia amylovora in the Czech Republic
Josef KORBA, Jana ŠILLEROVÁ, Václav KŮDELA
Plant Protect. Sci., 2008, 44(3):91-96 | DOI: 10.17221/19/2008-PPS
Sixty-four apple cultivars and selections of potential interest to apple producers and plant breeders in the Czech Republic were tested for their relative resistance to the fire blight pathogen over six years. Level of fire blight resistance was evaluated according to the extent of lesion development on the shoots tips after artificial inoculation in experimental plots under insectproof nets. Cultivars Quinte (resistant) and Yellow transparent (high susceptible) were included in the tests. Of 64 apple cultivars and selections tested, none were high resistant, 3.1% were evaluated as resistant, 10.9% moderately resistant, 57.8% moderately susceptible,...
New records of Chrysomyxa rhododendri on Rhododendron species
Ivana Šafránková
Plant Protect. Sci., 2008, 44(3):97-100 | DOI: 10.17221/27/2008-PPS
In the spring of 2008, leaf spot was observed on Rhododendron hippophaeoides and Rhododendron obtusum; the causal agent was identified as the rust Chrysomyxa rhododendri. The rust occurs primarily in mountain regions and in the Czech Republic was first observed 105 years ago. In the present study we describe pathogen morphology and symptoms on the two new host species.
Disease suppression in Ganoderma-infected oil palm seedlings treated with Trichoderma harzianum
Mohd Zainudin Nur Ain Izzati, Faridah ABDULLAH
Plant Protect. Sci., 2008, 44(3):101-107 | DOI: 10.17221/23/2008-PPS
Disease suppression in Ganoderma-infected oil palm seedlings treated with a conidial suspension of Trichoder-ma harzianum FA 1132 was tested in plant house conditions to determine the effectiveness of the fungus as a biocontrol agent. The highest efficacy of control was achieved by treatment right after artificial infection; the total number of infected plants was reduced to give the lowest disease severity index (DSI) value of 5.0%, compared to the infected and non-treated control that had the highest DSI of 70.0%. After conidia suspension of FA 1132 was applied, the colony forming ability by Trichoderma in the soil was...
Parasitoids of cereal leaf beetle, Oulema gallaeciana (Heyden, 1879)
Monika JELOKOVÁ, Ján Gallo
Plant Protect. Sci., 2008, 44(3):108-113 | DOI: 10.17221/1260-PPS
Cereal leaf beetles are serious animal pests of crops in many areas of western and eastern Slovakia. Research was carried out in these areas in order to receive knowledge on occurrence of natural enemies of Oulema gallaeciana. We were detecting particular species of parasitoids parasitising Oulema gallaeciana and their spreading in particular area. The results showed that dominant parasitoid was Necremnus leucarthros. Other parasitoids with bigger proportion on parasitisation were Pteromalus vibulenus and Diplazon spp. with parasitisation up to 30%. In respect of significant parasitisation of Oulema...
Hercinothrips femoralis (Reuter, 1891) - a new pest thrips (Thysanoptera: Panchaetothripinae) in Slovakia
Lukáš Varga
Plant Protect. Sci., 2008, 44(3):114-118 | DOI: 10.17221/13/2008-PPS
Monitoring of pest species in plant production and extended trade on ornamental plant material, including precise identification, are the main goals of modern plant protection. As a result, a new species of phytophagous thrips - Hercinothrips femoralis (Reuter, 1891) was recorded in Slovakia (experimental greenhouse in Comenius University, Bratislava) in mid 2007. Some plant specimens infested by this pest showed signs of lesions especially on young leaves. The species has been reported in more European countries recently. Due to the potential damage it can cause, increased attention should be paid to pest monitoring.
Obituary of Associate Professor RNDr. JOSEF ŠEDIVÝ, DrSc. (1925-2008)
František Kocourek
Plant Protect. Sci., 2008, 44(3):119-120 | DOI: 10.17221/1266-PPS