Plant Protection Science, 2004 (vol. 40), issue 2
Characteristics of a potyvirus associated with a mosaic-like disease of yellow oat-grass
Lenka Širlová, Josef Vacke, Milan Jokeš
Plant Protect. Sci., 2004, 40(2):37-41 | DOI: 10.17221/462-PPS 
The properties of a new filamentous virus found on yellow oat-grass (suggested name Trisetum flavescens mosaic virus - TFMV) were compared with those of the two potyviruses Oat mosaic virus (OMV) and Oat necrotic mottle virus (ONMV). The latter viruses were chosen because their host range, virus particles and some other characteristics are similar to TFMV. Mechanical transmission of TFMV to some OMV and ONMV host plants, drop precipitation, indirect-ELISA, DAS-ELISA, SSEM and RT-PCR were used in the study. However, there was no proof that TFMV is identical with OMV or ONMV. Avena abyssinica and Bromus mollis...
Scab disease of firethorn at selected localities in Slovakia
Gabriela Juhásová, Helena Ivanová, Katarína Adamčíková, Marek Kobza, Andrea Čerevková
Plant Protect. Sci., 2004, 40(2):42-48 | DOI: 10.17221/461-PPS
The health state of firethorn, Pyracantha coccinea, was evaluated in different types of functional urban greenery at locations in Slovakia during 2001 (34 sites) and 2002 (18 sites). The occurrence of scab disease, caused by the fungus Spilocaea pyracanthae, was recorded. The degree of damage to firethorn fruits was evaluated; it ranged from 3.6% to 98.8% (2001) and from 9.1% to 38.5% (2002). Germination of conidia of the fungus ranged between 42 and 50% at 24-25°C after 24 h, and from 49% to 61% after 48 h. The germination of conidia collected on different parts of the plants from July to September was compared. Conidia taken from...
Influence of parasitisation on cereal aphids (Sternorrhyncha: Aphidoidea) in various field management
Ján Praslička, Timotej Miština
Plant Protect. Sci., 2004, 40(2):49-53 | DOI: 10.17221/460-PPS
The level of parasitism of cereal aphids on winter wheat at growth stage 69 DC (end of bloom) differed between two field management used (integrated and ecological) and between individual years of the experiment (1999-2001). Parasitism was always higher in the ecological field management. The average number of parasitised aphids per tiller was 1.84 in the integrated field management but 2.63 in the ecological field management. The average rate of aphid parasitisation was 8.31% in the integrated system, but 16.15% in the ecological field management and thus 94.33% higher.
Mortality of Metopolophium dirhodum (Homoptera: Aphididae) caused by strains of Erynia neoaphidis (Entomophthorales: Entomophthoraceae) from Slovakia and Greece
Marian Eliašová, Bernard Papierok, Ľudovít Cagáň
Plant Protect. Sci., 2004, 40(2):54-62 | DOI: 10.17221/2724-PPS
The aim of the study was to test isolates of Erynia neoaphidis originating from Slovakia and Greece for infectivity to Metopolophium dirhodum, and evaluate selected strains for their infectivity at different temperatures. For alatae, an LC50 (number of spores/mm2) from 109.97 to 230.90 was calculated for the Slovakian strain and of 218.9 for the Greek strain. For apterae, the LC50 was 82.2-194.5 for the Slovakian strain and 367.2 for the Greek strain. The temperature during the incubation period influenced mortality and length of life cycle of the fungus. Lower temperature decreased the mortality and...
Mycoparasitic fungi Trichoderma spp. in plant protection - Review
Jana Brožová
Plant Protect. Sci., 2004, 40(2):63-74 | DOI: 10.17221/459-PPS
Trichoderma harzianum is a worldwide soilborne anamorphic fungus. It is a facultative parasite of a wide spectrum of fungi, but can also live as a saprophyte. The manifestation of its antagonism displays as support competition, parasitism and antibiosis. Some species of the genus Trichoderma can be utilised in plant protection because of their mycoparasitic and other properties. The biofungicide Supresivit containing conidia of T. harzianum is registered in the Czech Republic. A commercially prepared mixture of the biopreparation and granulated mineral fertiliser is a novel way to introduce it into the plant environment....