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A total of 94 pectolytic and 60 nonpectolytic Pseudomonas isolates were obtained from 250 samples of rotted vegetable specimens representing various economically important vegetables. The isolates were identified on the basis of standard biochemical tests. Pseudomonas fluorescens biovar V and II and Pseudomonas putida were the most abundant species among pectolytic isolates and Pseudomonas fluorescens...
Studies carried out for many years in the experimental field in Winna Góra refer to the biocenotic regulation of aphids in agricultural cultivations by aphidophagous Diptera of Syrphidae. Experiments were carried out in conditions of an agricultural lanscape differentiated by the presence of field afforestation.
The quantity and quality of spears from asparagus plants infected with Asparagus virus 2 was lower in comparison to healthy plants. The total number of spears was decreased in 16% and mass of spears in 24.7%. Asparagus virus 2 reduced the number of marketable spears in 31.9%, and increased the number of unmarketable spears in 20.2%. The green mass of stem brushes of infected plants was reduced in...
Experimental cucumber and tomato plants were cultivated under glasshouse conditions with or without PGPR. Young plants were infested with spider mites (T. urticae - cucumber and T. cinnabarinus - tomato). Leaves were analysed for protein and amino acid concentration. In infested leaves of the cucumber cultivar, susceptible to spider mites (Corona), an important decrease in protein content occurred...
Three Polish, four other European and three tropical isolates of the nematophagous fungus Verticillium chlamydosporium were screened for their ability to colonise the surface of barley roots, produce chlamydospores and infect eggs of Meloidogyne incognita in laboratory tests. PCR-fingerprinting of different Polish isolates and Vc10 was used to detect differences between isolates. Among the European...
The numbers of Curculionoidea showed a growing tendency during the initial four years of alfalfa crop use for green fodder, but in the subsequent years they decreased significantly. The number of species increased with the plantation age.
Sitona humeralis Steph. has one generation per year. Adults survive through the winter. Full life cycle from egg to adult lasts 54 days on average, including about 10 days for embryo, 30 days for larval and 14 days for pupa stage.
The research on the occurrence of Curculionoidea carried out in 1990-1995, in south-eastern Poland showed that Sitona humeralis Steph. was the most numerous species. Its participation among all the collected Curculionoidea was 69.4%. Other species occurring on alfalfa crops were: Hypera postica (Gyll.)- 7.7%, Sitona lineatus (L.)- 5.0%, Sitona hispidulus (Fabr.) - 4.7% and Apion tenue Kirby 4.4% of...
Disappearance of chlorothalonil, dichlofluanid, vinclozolin and carbendazim, as active ingredients of agrochemicals commonly used for the protection of greenhouse vegetables against fungal diseases, was studied comparatively. It was found that initial residues of chlorothalonil and dichlofluanid dropped by half within 4 and 2 weeks after treatment, respectively, while the deposits of vinclozolin and...
The research was conducted to evaluate the impact of sulphur compounds on the sex of Colorado potato beetle in the region of sulphur factory in Chmielów near Tarnobrzeg in 1995. The control plantations were situated in the village of Zarębki, about 30km from Chmielów. The object of the study was the average body mass of female and male specimen of the insect after full spring beetle appearance in...
Adults of Sitona humeralis Steph. damage leaves of alfalfa, causing bay-shaped leaf holes characteristic for the Sitona spp. The larvae damage root nodules, taproots and open the infection paths for pathogenic fungi which occur in soil and on the root surface which results in the withering of plants.
The influence of oilseed rape glucosinolates on the grown in vitro pathogenic fungi was studied. Two pathogenic to oilseed rape fungi species: Fusarium roseum and Rhizoctonia solani were taken into consideration. It was observed that glucosinolates added to the medium limited the growth of both tested fungi to some extent, especially when higher concentrations of glucosinolates was supplied.
Piesma quadratum is the only vector of beet leaf curl - virosis affecting sugar beet. The sugar content of beets infected by beet leaf curl is reduced by an average of 9% and the root weight is decreased by an average of 58.4%. P. quadratum appeared in Poland in the beginning of this century after migration from the territory of Germany. This bug has one generation a year. lts occurrence is characterised...
Investigations were carried out in 1996-1998 on experimental plots sown with different oat cultivars and lines. Symptoms of the fusarium panicle blight developed on 0.5-15% of oat plants. Results of this studies showed that fusarium blight of oat panicles is widespraed in Lublin region. Fusarium avenaceum and F. poae proved to be the cause of the disease. Also F. culmorum, F. crookwellense, F. equiseti,...
This work presents some properties of Sunn-hemp mosaic tobamovirus (SHMV) orginally isolated from bean plants. Virus infected host range and induced symptoms that were typical for SHMV. Following plant species distinquished SHMV from tobacco mosaic tobamovirus (TMV): Phaseolus vulgaris, Pisum sativum, Lupinus albus and Lycopersicon esculentum. In immunoblotting the serum against SHMV did not react...
The aim of the experiments was to evaluate the effect of Sekator 6,25 WG used for broad leaved weeds control in winter and spring cereals. Sekator 6.25 WG herbicide is composed of iodosulfuron 1.25%, amidosulfuron 5% and mephenpyr diethyl 12.5%. The field trials were conducted over the period 1997-1999 at experimental station, which belonged to the Institute of Plant Protection. The results showed...
The purpose of the studies conducted in the years 1996-1998 was to determine the quantitative and qualitative composition of bacterial and fungal communities in rhizosphere of soybean cultivated in monoculture and non-rhizosphere soil. Besides, the proportion of bacteria and fungi, which were distinguished by their antagonistic effect towards soil-borne pathogens was established. A microbiological...
Phoma exigua var. inoxydabilis var. nov. predominated among fungal isolates obtained from diseased stem runners and leaves of periwinkle (Vinca minor). The growth of the fungus was observed at temperaturę ranges from 7.5 to 30°C with optimum at 25°C. Abundant formation of picnidia was noticed mainly on malt extract agar at temp. 15-25°C. On potato-dextrose agar picnidia were observed 3-5 days later...
The purpose of the studies carried out in the years 1996-1998 was to establish the composition of bacteria and fungi communities in the potato rhizosphere and non-rhizosphere soil. Besides, in the examined samples the studies established the proportion of bacteria and fungi antagonistic towards soilborne pathogens. The microbiological analysis of 1 g of dry weight of soil coming from the rhizosphere...
The paper present results from the studies carried out in the years 1999-2000 on the effectiveness of seed dressing of spring barley with the insecticide Gaucho 350 FS (a.i. imidachloprid) to control frit flies, gout flies, aphids and thrips in piedmont conditions.
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