Life Sciences and Agriculture

Journal of Plant Protection Research

Content

Journal of Plant Protection Research | 2003 | vol. 43 | No 2

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Abstract

In 1999-2001 the occurrence of thrips was analysed on seven cultivars of pea. The samples of leaves, then leaves and flower buds and the flowers were collected from plots. The analyses were initiated when the earliest cultivar (Sześciotygodniowy) began flowering and were repeated every 4-7 days, until the end of flowering. The following species of th rips were found: Franklinie/la intonsa Trybom, Thrips major Uzel, Thrips fuscipennis Hal., Thrips tabaci Lind. and Kakothrips robustus Uzel. The clear differences between the number of thrips on the particular cul tivars of pea were noticed. The most attractive were late cultivars Nike and Telefon as well as middle late Delisa II. It seems that the most important factor effecting on the number of thrips on particular cultivars was rather the start and the end of flowering than the length of the flowering period. The greatest number of thrips was noticed on flowers, from 50% to 77%. The thrips initially were found on leaves and then, as the pea was growing, on the flower buds and flowers. After the emergence of thrips, the analyses should be first initiated on leaves.
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Authors and Affiliations

Andrzej Wnuk
Maria Pobożniak

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Abstract

The antifeedant activity of lactones with di- and trimethylcyclohexane system was assessed in choice and no-choice bioassays against Leptinotarsa decemlineata and Alphitobius diaperinus larvae and beetles. The results showed that feeding deterrent activity depends on the structure of the tested compounds. Additional methyl group in the molecule of some compounds influences their activity increase or changes their properties from attractant to deterrent ones. The present results also demonstrate the species and developmental stage dependence of antifeedant activity.
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Authors and Affiliations

Maryla Szczepanik
Małgorzata Grabarczyk
Antoni Szumny
Czesław Wawrzeńczyk
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Abstract

The purpose of the presented studies was to determine the species composition of the fungi occurring on the underground parts of potato at an thesis and to establish the qualitative and quantitative composition ofmicroorganisms living in the soil environment of this plant. Besides, the studies aimed at finding antagonistic microorganisms inhibiting potato infection by soil-borne phytopathogens. The mycological analysis showed that the symptoms of necrosis on the roots and the stem base of potato were caused by Alternaria alternata, Fusarium spp., Colletotrichum coccodes and Rhizoctonia so/ani. The microbiological analysis of the potato rhizosphere gave twice as many bacteria and fungi as from the non-rhizosphere soil. The dominating pathogenic fungi in the examined soil samples were Fusarium spp., A. alternata and R. so/ani. Three times as many antagonistic bacteria Pseudomonas spp. and Bacillus spp. and more than twice as many antagonistic fungi (Penicillium spp., Trichoderma spp., Gliocladium spp.) were obtained from the potato rhizosphere as compared to the non-rhizosphere soil.
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Authors and Affiliations

Danuta Pięta
Elżbieta Patkowska
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Abstract

This paper presents the results of observations on occurrence of Tetranychidae. During 1995-2001 investigations a total of 10 species, namely Bryobia praetiosa, Eotetranychus carpini, E. cary/i, E. pruni, E. tiliarum, Eurytetranychus buxi, Panonychus ulmi, Schizotetranychus schizopus, Tetranychus viennensis and T. urticae were collected in ornamental nurseries in Poland. The T. urticae was the most frequent species ofmites and it was found on 60 different species of plants belonging to 1 7 families. This species caused severe damage on Spiraea japonica (Rosaceae), Ulmus minor 'Jacqueline Hillier' (Ulmaceae), Magnolia spp. (Magnoliaceae), Buddleja davidii (Buddlejaceae), Sambucus nigra (Caprifoliaceae), Laburnum xwatererii (Fabaceae) and Daphne mezereum (Thymelaceae). Among ocher tetranychids, S. schizopus is also dangerous pest of grafted willows.
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Authors and Affiliations

Grażyna Soika
Gabriel Łabanowski
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Abstract

The studies conducted in two different localities revealed variable time of occurrence and severity level of potato early blight (Alternaria spp.). Each year at Stare Olesno the early blight caused considerable destruction of potato plants (90.2%-95.4%) while at Bonin the disease severity differed in particular years and ranged from 50.0% to 97.5% of destructed plants at the end of the growing season. Field trials showed good efficacy of fungicides selected for controlling the early blight compared with an untreated control. Spraying with fungicides limited development of the disease and increased tuber yield in the range from 21.9% to 60.9% for Bonin and from 13.0% to 101.9% for Stare Olesno surveys. The mixture of zoxamide with mancozeb showed the greatest efficacy.
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Authors and Affiliations

Józefa Kapsa
Jerzy Osowski
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Abstract

A characteristics of three extracellular metabolites produced by Bacillus coagulans strain that were supposed to be responsible for its fungistatic activity against Trichothecium roseum has been done by TLC, GC-MS and Western blotting methods. It was shown that these compounds of molecular weights as 41, 45 and 65 kDa secreted to the medium by bacteria had glycoprotein properties and did not become inactive when boiled for 20 min., as characteristic for glycoprotein.
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Authors and Affiliations

Wojciech Folkman
Bogumiła Lisiecka
Barbara Stachowiak
Krystyna Trojanowska
Krzysztof Gulewicz
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Abstract

The deterrent effect of limonene enentiomers and limonene derivative: ( + )-(1S,4S,6S)-4-(1-methylethenyl)-9-oxabicyclo[ 4.3.0]nonan-8-one, on Myzus persicae was investigated. Only S-enantiomers of limonene and its derivative showed feeding deterrent properties. S-limonene inhibited phloem sap ingestion and reduced the number of phloem sap ingestion phases during aphid stylet penetration of plant tissues. Aphids spent twice less time on leaves painted with ( + )-1S,4S,6S-4-(1-methylethenyl)-9-oxabicyclo[ 4.3.0]nonan-8-one than on control and S-limonene-treated leaves and the probes were shorter than 2 minutes on these leaves. Our studies confirmed that the chiral centre configuration of the lactones was important in expression of feeding deterrent activity.
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Authors and Affiliations

Aleksandra Halarewicz-Pacan
Beata Gabryś
Katarzyna Dancewicz
Czesław Wawrzeńczyk
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Abstract

In different plant species maternal factors influence the germinability of seeds. It can also be modified by environmental factors occurring during development and maturation. Achenes ofMatricaria maritima subsp. inodora were collected in summer 1995. Some of seeds were tested under controlled conditions in autumn the same year. The other part of seeds was buried. After 6-month stratification in the soil, diaspores were tested under the same conditions as a sample examined in autumn. It was shown a difference in germination, which was dependent on stage ofmaturation seed, position of inflorescence on the mother plant and the position of seeds in inflorescence. It was observed that seeds germinated much better in autumn than diaspores stored in the soil during winter.
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Authors and Affiliations

Magdalena Kucewicz
Czesław Hołdyński
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Abstract

Bionomy of spruce spider mite (SSM) (Oligonychus ununguis Jacobi) on five species/cultivars of spruce and two species of cypress was studied under laboratory conditions during rwo consecutive growing seasons. The study showed influence of host-plant food on development time, fecundity and longevity of SSM. The comparison of intrinsic rate of natural increase (r,J indicates the highest reproduction potential of SSM on Picea pungens (0.18), P. abies 'Nidiformis' (0.17), and P. glauca 'Conica' (0.14). SSM had much lowest rm on P. omorica (O.OS) and P abies 'Virgata' (O.Ol). The reproductive potential of SSM on rested species of cypresses was similar: 0.12 and 0.10 on Chamaecyparis lawsoniana 'Golden Wonder" and C. pisifera 'Nana Aureovariegata', respectively. The results obtained clearly indicate that the population parameters can be a proper indicator ofrelative susceptibility/resistance of commercially available species/cultivars of spruce and cypress plants to SSM.
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Authors and Affiliations

Barbara Czajkowska
Małgorzata Kiełkiewicz
Ewa Puchalska
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Abstract

In the years 1996-2002 evaluation of herbicides' efficacy used in low doses was tested. For investigations several herbicides recommended for weed control in cereals were selected. The results of experiments indicate on possibility of reducing of herbicides' doses by about 25 to 3 7.5%, and still obtaining good effects ofweed control without significant decrease of yielding of cultivation plants. The dose is depended upon sensitivity of weed species, growth stage of weeds and their infestation, density of crop and the weather conditions. Low doses of herbicide can be applied where weeds are in early growth stage, where there is low infestation ofweeds, and weeds show susceptibility to used herbicides, moreover under correct crop density and good weather conditions.
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Authors and Affiliations

Krzysztof Domaradzki
Henryka Rola
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Abstract

The NegFry model used for timing the chemical control of potato late blight was validated in field trials at Bonin in the years 2001-2002 (4 trials). In these trials the number of fungicide treatments recommended by NegFry was about 34.5% lower (on average) than the number of treatments in a routine spraying scheme. This reduction was mostly the results of a delay in the time of the initial fungicide application and longer spraying intervals recommended by Negfry.
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Authors and Affiliations

Józefa Kapsa
Jerzy Osowski
Edward Bernat
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Abstract

The influence of different nozzle types and adjuvants on the biological efficacy of fungicides in potato was investigated in four growing seasons in the years 1997-2000. The studied foliar plant disease was late blight (Phytophthora infestans). The biological efficacy of fungicides (alone or with adjuvants) applied with coarse air induction nozzles was comparable to fine standard flat fan nozzle. The differences between the nozzle types tested were small in control oflate blight in potato with systemic and contact fungicides. Coverage of upper side of leaf blades was from three to four times higher than lower side of leaf blades. In general, the highest coverage of upper and lower side of leaf was achieved when the full dosage rate of fungicide (copper oxychloride) was used with both the flat fan XR 110-03 and air induction DB 120-03 nozzle. Adding Atpolan 80 EC and Zero Piany 62 SL to 50% dosage rate of copper oxychloride decreased the spray coverage on lower side ofleaf as well as with both the XR 110-03 and DB 120-03 nozzles. However, addition of adjuvants to spray solution did not decrease the deposition on upper side of leaf blade. In general, adjuvants did not considerably influence the biological efficacy of the fungicide treatments sprayed with both the flat fan and the air induction nozzles but had favourable influence on potato yield.
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Authors and Affiliations

Roman Kierzek
Marek Wachowiak
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Abstract

In Poland, about sixty fungicides are registered for chemical protection of potato crops against late blight (Phytophthora infestans) and some of them are effective against early blight (Alternaria spp.). Time of appearance of pathogens in potato crops depends on climatic conditions. In Bonin climatic conditions in the years 1998-2002, early blight was observed at the earliest date i.e. 41-56 days after potato planting. Trials carried out at the Plant Breeding and Acclimatization Institute Bonin have shown different usefulness of fungicides in control of some pathogens of potato. The tested fungicides varied in their mobility (contact, translaminar, systemic) and activity against pathogens (protectant, curative, eradicative). All tested fungicides were effective in control of late blight in potato crops. They inhibited the rate of late blight development and in most cases the differences of their effectiveness were not significant. Systemic fungicides with slower mobility have the best efficacy in control of late blight infections occurring on potato stems. In laboratory tests, mancozeb, propineb and mixture of metalaxyl and mancozeb were significantly more effective in inhibiting the development of Alternaria. Fungicides, which are effective in the control of different pathogens, are particularly useful in potato protection programs.
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Authors and Affiliations

Józefa Kapsa

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