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1
Artykuł dostępny w postaci pełnego tekstu - kliknij by otworzyć plik
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Occurence of aphids on Cornus alba L.

100%
Jaskiewicz B.
Acta Scientiarum Polonorum. Hortorum Cultus
|
2003
|
tom 02
|
nr 1
The studies were conducted on Cornus alba L. in the years 1999–2001 in the green areas on two sites: with heavy traffic (site A) and no traffic (site B). C. alba was the host plant for two species of aphids: Anoecia corni (F.) and Aphis salicariae Koch. A. corni was dominating in the years of observations and it was most numerous in 2000, while A. salicariae in 1999. The weather had a significant effect on the aphid population. After a mild winter and warm spring aphids were more numerous. High temperatures (over 30°) and stormy rainfalls as well as autumn ground frosts limited their population. On the other hand, aphidophagous species did not limit the population of aphids in any considerable manner. A. corni lowered the ornamental values of C. alba shrubs, especially in autumn.
2
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The biology of flowering and structure of selected elements of Cornus alba L. flowers

84%
Konarska A.
Acta Agrobotanica
|
2009
|
tom 62
|
nr 1
The biology of flowering and the micromorphology of Cornus alba flowers were studied using light and scanning electron microscopy. The flowering of white dogwood in 2008 lasted 35 days, and the lifespan of a single flower was 3 days. The number of flowers per inflorescence was variable (on the average, it was 89). The largest group of insects visiting the flowers of C. alba comprised Hymenoptera (mainly bees and andrenids), then ants, dipterans and beetles. They foraged the dogwood flowers most intensively between 11.00 and 15.00. The inconspicuous four-petalled flowers of C. alba were characterised by the occurrence of T-shaped, two-armed non-glandular trichomes covering the receptacle as well as observed on the petals of the corolla, the style of the pistil and the anthers in a smaller number. The trichomes were covered by a thick cuticle with characteristic outgrowths. They contained a living protoplast, and plastids were observed in the cytoplasm of the trichome cells. In addition, anomocytic stomata were found in the epidermis of the receptacle and in the epidermis of the corolla petals. The stigma of the pistil and the adaxial epidermis of the petals were composed of very numerous conical papillae.
3
Artykuł dostępny w postaci pełnego tekstu - kliknij by otworzyć plik
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Deren, dereniowka oraz swidwa

67%
Karczmarczuk R.
Wszechświat
|
2010
|
tom 111
|
nr 10-12
260-265
4

Derenie krzewy na wszystkie pory roku

67%
Bielenin M.
Działkowiec
|
1998
|
nr 11
14-15
5

Krzewy na dobry poczatek

67%
Szydlo W.
Kwietnik
|
2003
|
nr 01
54-55
6

Moda na lisciaste - towarzystwo dla kolkwicji

67%
Lazucka-Ceglowska K.
Kwietnik
|
2003
|
nr 05
70-71
7
Artykuł dostępny w postaci pełnego tekstu - kliknij by otworzyć plik
Content available

Rhizogenesis and gas exchange in dogwood stem cuttings as affected by two biostimulators

67%
Pacholczak A., Pietkiewicz S.
Dendrobiology
|
2014
|
tom 72
The UE-imposed restrictions on the manufacture and use of plant protection chemicals necessitate screening for new substances that are more environmentally friendly. Biopreparations may constitute such a group; therefore, studies on their efficiency in the production of plant material are needed. This study evaluated the effects of two biostimulators on rhizogenesis and the gas exchange rate (respiration, photosynthesis, transpiration) of stem cuttings of dogwood (Cornus alba) as compared to conventional treatments with a rooting powder containing 2% auxin IBA and with aqueous IBA solution. Both biopreparations enhanced rhizogenesis; their efficiency varied depending on the cultivar, biostimulator applied, and the number of treatments. There was no relationship between rhizogenesis and physiological parameters tested. The experiments demonstrated that at least some biopreparations have potential in commercial production but their effectiveness may be different in different species and under different conditions.
8

Kolumnowy cis

59%
Widaj J.
Kwietnik
|
2012
|
nr 01
9

Rosliny barwne zima

59%
Kwietnik
|
2004
|
nr 12
54-55
10

Ozdobne pedy

59%
Frazik-Adamczyk M.
Działkowiec
|
2001
|
nr 12
14-16
11

Kolorowa zima

59%
Mój Piękny Ogród
|
2005
|
nr 12
4-7
12

Na kazda pore roku

59%
Latocha P.
Działkowiec
|
2010
|
nr 11
22-23
13

Kolorowe derenie

59%
Mój Piękny Ogród
|
2011
|
nr 01
4-6
14

Barwna kora drzew i krzewow

59%
Mój Piękny Ogród
|
1998
|
nr 12
22-25
15

Styczniowe ozdoby ogrodu

59%
Gawrys W.
Ogrody, Ogródki, Zieleńce
|
2008
|
nr 01
16

Rosliny zdobne purpura

59%
Gursztyn L.
Kwietnik
|
2007
|
nr 02
50-51
17

W zimowym nastroju

51%
Penar E.
Aura
|
2000
|
nr 02
28-29
Winter garden, covered with snow, is as beautiful as autumn or spring garden. One should only take a look to appreciate it. The author focuses on colourful fruit of trees and shrubs, such as the firethorn, cotonoeaster, barberry, as well as the witch hazel and winter blooming hellebore, and the colourful shoots of cornels. A garden in its winter cloak is quite unique although different than that in other seasons.
18
Artykuł dostępny w postaci pełnego tekstu - kliknij by otworzyć plik
Content available

Kłopotliwe derenie - Cornus alba L. i C. sericea L. (Cornaceae). Dwa gatunki czy jeden?

51%
Zielinski J., Tomaszewski T., Gawlak M., Orlova L.
Rocznik Polskiego Towarzystwa Dendrologicznego
|
2014
|
tom 62
The history of taxonomy and problems with identification of two very similar and closely related dogwoods Cornus alba and C. sericea are discussed. They were described by Linnaeus on the basis of flowering cultivated specimens of unknown origin. When characterizing their fruits, Linnaeus got the information from the older, “pre-Linnean”, literature and wrote that they were white in C. alba (Linné 1767) and black in C. sericea (Linné 1771). It was soon pointed out that both taxa had white fruits, however, their specific identity has not been questioned for a long time. Cornus alba and C. sericea are considered to be geographically isolated – the former is recorded from Siberia and NE Europe, while the latter from North America, but both dogwoods are often cultivated and naturalize in many places outside their natural ranges. In European dendrological literature, in which both plants are usually mentioned, there are permanent controversies concerning the differences between them. Attempts are still made to distinguish them, mainly on the basis of their stones and leaf shapes. Narrow stones and abruptly narrowed leaf apex have been attributed to C. alba, while broad stones have been said to be characteristic to C. sericea. Our analysis reveals that shapes of stones of discussed taxa are very variable and their ranges of variability overlap to a considerable extent. The similar kind of variability can be observed in the shape of leaves of both dogwoods. In C. alba leaf blades are most often broadly elliptic and abruptly narrowed, while in C. sericea they are most often broadly ovate and gradually narrowed at the apex. It must be said that there are also numerous exceptions to the above scheme. The filigree pattern of cuticle and the wax crystals on the abaxial leaf surface are sometimes useful for distinguishing C. alba and C. sericea. Unfortunately both features are also variable as those characterized above. Taking into consideration the great similarity of discussed dogwoods and difficulties with their identification, in our opinion the broad species concept of C. alba (including C. sericea) is most reliable and practical. However, as it appears from presented results, both taxa are not fully identical, so the rank of subspecies proposed by Wangerin (1910) – C. alba L. subsp. alba and C. alba subsp. stolonifera (Michx.) Wangerin, seems to be most appropriate in their case. It facilitates identification of wild plants of C. alba s.l. both in flowers and fruit as well as in the vegetative state. It also helps avoid controversy with the classification of cultivars of uncertain origin.
19

Zdobia je pedy

51%
Działkowiec
|
1998
|
nr 01
8-9
20

Dla oka i dzioba

51%
Narkiewicz M.
Kwietnik
|
2009
|
nr 01
50-53
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