共查询到12条相似文献,搜索用时 31 毫秒
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Ursula Timans 《European Journal of Forest Research》1986,105(1):471-477
Zusammenfassung In verschiedenen Gebieten Bayerns, die von den neuartigen Fichtensch?den betroffen sind, wurden gesch?digte, aber auch noch
intakte Fichten auf einen Befall durch Schadinsekten und insbesondere durch pflanzenparasit?re Nematoden untersucht. Ein Zusammenhang
zwischen forstsch?dlichen Insekten und den Fichtensch?den konnte weder bei gro?fl?chigen Beobachtungen noch bei Untersuchungen
von einzelnen B?umen festgestellt werden.
Die nematologischen Untersuchungen wurden anhand von Boden- und Holzproben sowie an Feinwurzeln gesch?digter und ungesch?digter
Fichten durchgeführt. Weder im Stammholz noch in den Feinwurzeln konnten pflanzenparasit?re Nematoden nachgewiesen werden.
In den Bodenproben waren zwar meist phytophage Nematoden vorhanden, jedoch in so geringer Anzahl, da? eine direkte Sch?digung
der Fichten ausgeschlossen werden konnte. Au?erdem waren die Nematoden sowohl bei gesch?digten wie bei ungesch?digten Fichten
gleicherma?en vertreten. Demnach k?nnen pflanzenparasit?re Nematoden als (Mit-)Verursacher der neuartigen Fichtensch?den ausgeschlossen
werden.
Herrn Prof. Dr.W. Schwenke, Leiter des Lehrstuhls für angewandte Zoologie, München, zum 65. Geburtstag gewidmet. 相似文献
Connection between the decline of spruce and occurrence of animal pests, especially nematodes
Summary In various regions of Bavaria, affected by the decline of spruce, attack by insects and especially nematodes was examined on diseased and healthy spruces. A connection between harmful forest insects and the decline of spruce did not become evident, neither over wide areas nor by examination of single trees. Attack by nematodes was examined in soil and wood samples and also in fine feeder roots of diseased and healthy trees. Plant-parasitic nematodes were not found in the wood and in feeder roots. Although root-parasitic nematodes were present in soil samples, their density was too little to account for a direct damage to spruce. They occurred likewise in samples from healthy and diseased trees. Plant-parasitic nematodes can thus be excluded as a possible causal agent for the decline of spruce.
Herrn Prof. Dr.W. Schwenke, Leiter des Lehrstuhls für angewandte Zoologie, München, zum 65. Geburtstag gewidmet. 相似文献
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W. Laatsch M. Alcubilla G. Wenzel H. v. Aufsess 《European Journal of Forest Research》1968,87(1):193-203
Ohne Zusammenfassung 相似文献
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Dr. F. M. Salem 《Journal of pest science》1979,52(1):13-14
Granular organophosphate nematicide, Nemacur 5% G was tested againstMeloidogyne javanica in tomato roots in sandy clay-loam soil at the rate of 1,5 kg a.i./feddan under three different methods of application. Results indicated that applying half of the nematicide dose two weeks pre-transplanting and the rest at transplanting time was the best method tested based on percent suppression in nematode population. Not much worse results gave the applying of all the nematicide dose simultaneously at transplanting. The effect was essential smaller when the half of the nematicide was given at transplanting time and the rest dose followed two weeks later. 相似文献
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M. Von Alcubilla M. P. Diaz-Palacio K. Kreutzer W. Laatsch K. E. Rehfuess G. Wenzel 《Forest Pathology》1971,1(2):100-114
Relationships between nutrition and heart rot attack of Norway spruce (Picea abies Karst.) and the fungistatic effect of its inner bark . The fresh inner bark of Norway spruce stems and roots inhibits mycelium growth of Fomes annosus on malt agar. Nearly all fungistatic substances of the inner bark can be extracted with chloroform and acetone. The acetone-soluble fraction, which amounts to 13–27% of bark dry matter, was analysed. Up to now 12 phenolic substances have been identified, 5 of them have proved to inhibit Fomes annosus in vitro. Open-air-experiments showed, that desiccation of the root-zone, manganese deficiency and nitrogen hypertrophy decrease the inhibitory effect of the inner bark as well as its content of fungistatic substances. The degree of heart rot attack in older spruce stands was found to be negatively correlated with the N-, Fe- and Mn-concentrations in needles. 相似文献
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Zusammenfassung Es wird über das Auftreten von 14 Vorratsschädlingen, darunter 9 Käfer- und 3 Mottenarten, in den Lägern der Senatsbevorratung bis zu deren Auflösung berichtet. Ferner wird die Rangfolge des Auftretens von über 33 Schädlingsarten in Haushaltungen dargestellt. Die häufigsten Schädlinge in der Großlagerhaltung waren Speichermotten (Ephestia elutella) und Brotkäfer (Stegobium paniceum). Für den Vorratsschutz interessante Fälle und besondere Arten werden ausführlicher behandelt. Außerdem wird ein Überblick über die Bekämpfungsmaßnahmen gegeben, bei denen neben den Begasungsmitteln Methylbromid und Phosphorwasserstoff auch Vernebelungsmittel auf der Grundlage von Dichlorvos, Pyrethrum und Piperonylbutoxid in verschiedenen Anteilen eingesetzt wurden. Vorbeugend wurden auch DDVP-Strips gegen Mottenbefall verwendet.
Mit einer Abbildung und 3 Tabellen 相似文献
Stored products activities of the Plant Protection Service Berlin. Insect-pests of foodstuffs, luxury goods and materials in warehouses and private households as well as pest-control measures from 1987–1991
It is reported about 14 stored-product insects, among them 9 species of beetles an 3 species of moths appearing in the warehouses of the stock-piling division of the provincial government of Berlin (West) from 1987 up to the dissolution of the stocks in 1991. Additionally it is given an account of the appearance of more than 33 species of stored product pests in private households.The most common pests in the stocks and warehouses respecitively were warehouse moths (Ephestia elutella Hbn.) and the drugstore beetle (Stegobium paniceum L.). Particular cases and species of special interest are described in detail.Moreover a survey is given about the pest control activities in the stored products protection, which are carried out both with poison-gas as Methyl bromide and Phosphine as well as with aerosols on basis of Dichlorvos and Pyrethrum plus Piperonylbutoxide in different percentages. Dichlorvos slow resin strips are used prophylactically against stored-product moths in warehouses.
Mit einer Abbildung und 3 Tabellen 相似文献
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Zusammenfassung Es wurden in Kiefernkulturen Untersuchungen über die Tagesdynamik des Harzdruckes und der Intensität der Harzabsonderung geführt und die Ergebnisse in Beziehung zum Befallsgrad des KiefernknospentriebwicklersRhyacionia buoliana Schiff. gesetzt.Im Verlauf eines Tages variierte der Harzdruck wenig, die Intensität der Harzabsonderung dagegen stark. Die höchste Harzfluß-Intensität fällt in den Zeitraum zwischen 13 und 16 Uhr. Die Flugzeit des Wicklers, nach 18 Uhr, liegt somit außerhalb der Zeit des stärksten Harzflusses.Weder der Index der Harzfluß-Intensität noch jener des Harzdruckes zeigten eine Beziehung zur Stärke des Wicklerbefalls. Sie sind daher als Kriterien der Widerstandsfähigkeit einer Kulturkiefer gegenRh. buoliana, zumindest unter den Verhältnissen der Süd-Ukraine, nicht verwendbar.
Summary Studies on the diurnal rhythm of resin pressure and resin secretion in connection with the degree of pine-infestation byRhyacionia buoliana Schiff.In the course of one day pines in the age of 15 years showed only a small variation in resin pressure but a great one in secretion of resin. The maximal intensity of secretion was observed early in the afternoon. The moths ofRh. buoliana are flying after this time when the secretion of resin is low.There was no connection between resin pressure and secretion of resin on the one hand and the degree of pine-infestation byRh. buoliana on the other. The two factors are not suitable for indicating the degree of pine-infestation by this tortricid.
- . / 0 26 / /., , . , 13 15 . , , , , .相似文献
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Correlation between root starch content and crown damage of European beech (Fagus sylvatica L.). During a research project on forest decline in European beech stands the starch content of woody roots apparently of healthy and trees with dieback symptoms were examined by a histochemical method developed by Wargo . A comparison of affected and apparently healthy trees indicated no correlation between starch content of coarse roots and damage class derived from crown symptoms. However, results of these preliminary studies on distribution of starch in the root system of European beech confirmed the data reported in the literature. 相似文献
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Dr. S. A. Temerak 《Journal of pest science》1984,57(1):7-9
Laboratory experiments were undertaken to study the interrelationships which may be detected when rearing the ectoparasitoid,Bracon brevicornis onSesamia cretica larvae after being injected with the bacterial pathogen,Serratia marcescens at five constant temperatures. Many effects detrimental to the parasitoid were found through rearing onSerratia-infected larvae ofSesamia e.g. decreased the deposited eggs especially at 35°C; reduced the formed cocoons and produced adults at all temperatures (15–35°C); and prolonged developmental, repriod especially at 20 or 25°C. Number of infected host larvae which allowed complete successful development for the parasitoid was significantly decreased especially at the extremes of temperatures. 相似文献
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