Plant Protection Science, 2007 (vol. 43), issue 3
Severity of powdery mildew on winter barley in the Czech Republic in 1976-2005
Antonín Dreiseitl
Plant Protect. Sci., 2007, 43(3):77-85 | DOI: 10.17221/2247-PPS 
Results of scoring the reaction to powdery mildew of 240 winter barley varieties that were gradually included in 392 Czech Official Trials conducted at 21 locations were analysed. The reaction of the varieties was determined on the basis of the level of infection by the disease. Therefore, the data can also be used to assess the disease severity in years and at locations. Several characteristics indicative of disease severity were considered, including the disease severity coefficient (= average infection of susceptible varieties in trials with a high disease severity/the proportion of such trials). The value of the coefficient is inversely proportional...
Fungal infection of malt barley kernels in Slovak Republic
Tibor Roháčik, Kamil Hudec
Plant Protect. Sci., 2007, 43(3):86-95 | DOI: 10.17221/2249-PPS
The influence of agro-environmental factors (year, cultivar and climatic factors) on the occurrence of fungi on kernels of malt barley, species spectrum and seedling viability were evaluated during 2004 and 2005. The seeds (asymptomatic, fraction above 2.5 mm) originated from different cultivars and locations of the Slovak Republic. Surface sterilisation of the kernels before isolation of the fungi was the key factor for objective results on the occurrence of Fusarium species. Screening of non-sterilised kernels gave a different spectrum of fungal species and their frequency and may lead to distorted results. The most frequent species isolated...
Influence of baculovirus AdorGV on the mortality of larvae and pupae of summer fruit tortrix Adoxophyes orana in laboratory conditions
Karel Pepperný
Plant Protect. Sci., 2007, 43(3):94-102 | DOI: 10.17221/2245-PPS
The mortality of larvae and pupae of Adoxophyes orana was examined by keeping larvae of each larval instar (L1-L5) on an artificial diet in laboratory conditions. Larvae were infected by using an artificial diet containing AdorGV-based CAPEX® 2. Samples of uninfected larvae from each instar served as controls. The mortality of larvae infected in the 1st instar was 100%, compared to a mortality of 68% in the control. In both, the larvae died before the 5th larval instar. With larvae infected in subsequent instars the mortality rate declined gradually (96%-72%-40%-12%) and death occurred predominantly in the 5th...
Toxicity and spraying schedules of a biopesticide prepared from Piper guineense against two cowpea pests
Alphonsus Mbonu Oparaeke
Plant Protect. Sci., 2007, 43(3):103-108 | DOI: 10.17221/2251-PPS
The toxicity of three concentrations (5%, 10% and 20% w/v) and spraying schedules (2, 4 and 6 weekly applications) of an extract from West African black pepper, Piper guineense, for managing two major post-flowering pests of cowpea, Vigna unguiculata, was investigated in two cropping seasons at the Research Farm of the Institute for Agricultural Research, Ahmadu Bello University, Zaria, Nigeria. The insect pests were the larvae of Maruca vitrata (Lepidoptera: Pyralidae) and the cowpea coreid bug, Clavigralla tomentosicollis (Hemiptera: Coreidae). The higher concentrations (10% and 20% w/v) and more frequent applications...
Differences in growth and yield responses to Aphis gossypii Glover between different okra varieties
Hail K. Shannag, Jafer M. Al-Qudah, Ibrahim M. Makhadmeh, Nawaf M. Freihat
Plant Protect. Sci., 2007, 43(3):109-117 | DOI: 10.17221/2250-PPS
The reactions of five commercial varieties of okra, Abelmoschus esculentus, to A. gossypii were evaluated under semiarid field conditions. Each experimental plant of varieties Clemson spineless, Clemson spineless 80, Lee, Perkins dwarf, and Local was infested 60 days after emergence by three late-nymphal instars of the aphid. The results showed that aphid populations increased constantly on the varieties, except for days 42 and 49 after infestation, attaining a peak at about the end of the growing season. Differences in aphid densities were recorded between varieties. The aphids were most numerous on var. Local, while lowest in number...
Effect of soil applied herbicides and depth of sowing on common cocklebur (Xanthium strumarium L.) and maize (Zea mays L.) emergence and early growth
Zvonko Pacanoski, Tasko Kostov, Gordana Glatkova, Branislav Knežević
Plant Protect. Sci., 2007, 43(3):117-121 | DOI: 10.17221/2246-PPS
Greenhouse trials were conducted during 2005 to investigate the effect of six soil applied herbicides on common cocklebur (Xanthium strumarium L.) sowed at a depth of 4 cm and 7 cm, and determine the potential injury to maize by the herbicides and the influence of sowing depths. The efficacy of all herbicides was high, regardless of sowing depth and, generally, the coefficient of efficacy ranged from 86.3% to 100.0%. Most of the herbicides had no significant phytotoxic effect on maize plant density/container, height and fresh weight of maize. Exceptions were Atranex-90WDG and Cyatral-SCZ, which caused serious injury to maize (33% and 37%,...
Cryptocline taxicola (All.) Petr. - A new plant pathogen reported in Slovak Republic - Short Communication
Nadežda Bukvayová
Plant Protect. Sci., 2007, 43(3):122-124 | DOI: 10.17221/2248-PPS
Symptoms of fungal infection were observed on a plant of Taxus baccata in an urban park. Diagnosis of the pathogen showed the presence of the fungus Cryptocline taxicola. This is the first report of this fungus in Slovak Republic. Characteristics of visual symptoms and microscopic features are described.
A. Lebeda, P. T. N. Spencer-Phillips (eds): Advances in Downy Mildew Research. Vol. 3 (Proceedings of the 2nd International Downy Mildews Symposium) - Book Review
Karel Veverka
Plant Protect. Sci., 2007, 43(3):125-126 | DOI: 10.17221/2252-PPS