scholarly journals Ecological and biological features of taxa of the Cupressaceae family in dendrological collections of the dry-steppe region

2021 ◽  
pp. 4-34
Author(s):  
А.В. Семенютина ◽  
М.В. Цой
Keyword(s):  
Pseudotsuga Menziesii ◽  
Growth Dynamics ◽  
Woody Species ◽  
Juniperus Virginiana ◽  
Thuja Occidentalis ◽  
Platycladus Orientalis ◽  
Biological Features ◽  
Ecological Features ◽  
Steppe Region ◽  
Dry Steppe

Актуальность связана с расширением зеленого строительства на новых территориях в разнообразных и нередко тяжелых природных и агротехнических условиях возникла потребность в широком и разнообразном по биологическим и техническим свойствам ассортименте древесных пород и разработке дифференцированных методов их выращивания. Интродукция должна быть основана на обстоятельном изучении существующего опыта интродукции и знании стран – источников интродукции, истории формирования того или иного вида, учета экологических особенностей местообитаний, вертикальной зональности, существования географических и эдафических форм. Цель исследования заключалась в изучении эколого-биологических особенностей таксонов семейства Cupressaceae Bartl. в дендрологических коллекциях сухостепного региона. Исследованы шесть древесных вида семейства Cupressaceae, произрастающие в дендроколлекциях ФНЦ Агроэкологии РАН: Juniperus virginiana L., J. communis L., J. sabina L., Thuja occidentalis L, Platycladus orientalis(L.) Franco, Pseudotsuga menziesii (Milb) Franco. Изучены естественные ареалы объектов исследования. Выявлено, что виды подсемейства Thujoideae встречаются как в северном, так и в южном полушарии, виды подсемейства Juniperoideae (род Juniperus) – в умеренных областях северного полушария. Фенологические наблюдения выявили, что рост хвои у можжевельника обыкновенного начинался одновременно с ростом побегов в конце марта - начале апреля (на 1-1,5 месяца раньше, чем на родине), Период роста хвои продолжался 2-2,5 месяца, побегов – 135-180 дней. В ходе наблюдений за динамикой роста сеянцев, были получены метрические показатели сеянцев, 1-летние сеянцы Platycladus orientalis – 16-18 см, Thuja occidentalis – 9-14 см, J. communis – 10-15 см, J. sabina – 14-16 см, Juniperus virginiana – 14-16 см высотой. Анализ изменчивости морфологических признаков и биоэкологических свойств, адаптаций в новых условиях среды имеют большое значение для биоэкологического обоснования введения в культуру древесных таксонов семейства Cupressaceae. Этот анализ затрагивает оценку природного разнообразия растений с таких важных сторон, как скорость роста, устойчивость и декоративность, сведений о которых в засушливых условиях крайне мало. The urgency is connected with the expansion of green construction in new territories in diverse and often difficult natural and agrotechnical conditions, there is a need for a wide and diverse assortment of tree species in terms of biological and technical properties and the development of differentiated methods of their cultivation. The introduction should be based on a thorough study of the existing experience of introduction and knowledge of the countries - sources of introduction, the history of the formation of a particular species, taking into account the ecological features of habitats, vertical zonality, the existence of geographical and edaphic forms. The aim of the study was to study the ecological and biological features of the taxa of the Cupressaceae Bartl family. in dendrological collections of the dry-steppe region. Six woody species of the Cupressaceae family growing in the arboretum collections of the Federal Research Center of Agroecology of the Russian Academy of Sciences were studied: Juniperus virginiana L., J. communis L., J. sabina L., Thuja occidentalis L, Platycladus orientalis (L.) Franco, Pseudotsuga menziesii (Milb) Franco. The natural areas of the objects of study have been studied. It was revealed that the species of the subfamily Thujoideae are found in both the northern and southern hemispheres, the species of the subfamily Juniperoideae (genus Juniperus) – in the temperate regions of the northern hemisphere. Phenological observations revealed that the growth of needles in common juniper began simultaneously with the growth of shoots in late March - early April (1-1.5 months earlier than at home), the period of growth of needles lasted 2-2.5 months, shoots - 135-180 days. During observations of the growth dynamics of seedlings, metric indicators of seedlings were obtained, 1-year-old seedlings Platycladus orientalis - 16-18 cm, Thuja occidentalis - 9-14 cm, J. communis - 10-15 cm, J. sabina - 14-16 cm, Juniperus virginiana - 14-16 cm tall. Analysis of the variability of morphological features and bioecological properties, adaptations in new environmental conditions are of great importance for the bioecological justification of the introduction of woody taxa of the Cupressaceae family into culture. This analysis affects the assessment of the natural diversity of plants from such important aspects as growth rate, stability and decorative properties, information about which is extremely scarce in arid conditions.

scholarly journals Experience of introduction of coniferous plants in the conditions of dry steppe

2021 ◽  
pp. 17-32
Author(s):  
А.В. Семенютина ◽  
М.В. Цой ◽  
В.В. Сапронов
Keyword(s):  
Pseudotsuga Menziesii ◽  
Woody Plants ◽  
Vegetation Period ◽  
Plant Introduction ◽  
Biological Assessment ◽  
Juniperus Virginiana ◽  
Thuja Occidentalis ◽  
Platycladus Orientalis ◽  
Volgograd Region ◽  
Dry Steppe

В Волгоградской области единственным аборигенным представителем хвойных древесных растений является J. sabina L., существования популяции одного представителя хвойных свидетельствует об однородности дендрофлоры, что может привести к деструкции экосистемы в целом. Интродукция растений как инструмент на пути к достижению биоразнообразия дендрофлоры, является наиболее практичным и перспективным методом в условиях сухой степи. Целью исследования, являлось проведение биоэкологической оценки и жизненного состояния хвойных древесных растений, а также определение степени интродукционной устойчивости условиях сухой степи. Проведена оценка шести интродуцированных древесных растений в дендроколлекциях ФНЦ Агроэкологии РАН: Juniperus virginiana L., J. communis L., J. sabina L., Thuja occidentalis L, Platycladus orientalis(L.) Franco, Pseudotsuga menziesii (Milb) Franco. Определены сроки наступления и длительность основных фенологических фаз методикой фенологических наблюдений ГБС. При отклонении среднегодовой температуре воздуха выше нормы на 1,05 ºС и годовой суммы осадков 75% от нормы, длительность проявления периода вегетации составила у J. sabina L. – 58 дней, самый короткий период у J. communis L. – 41 день, Pseudotsuga menziesii (Milb) Franco 55 дней, J. virgiana L. – 56 дней, T. occidentalis L. – 71 день, P. orientalis (L.) Franco – 68 дней. В рамках эколого-биологической оценки были исследованы такие показатели как зимостойкость, засухоустойчивость, характер пыления и семеношения. Отдельно был исследован семенной материал методом определения массы 1000 семян. Также была дана оценка декоративности, по которой определялась специфика применения того или иного вида для целей озеленения. В результате проведенных исследований рассчитали значения акклиматизационного числа для каждого вида, по которому определена степень интродукционной устойчивости в условиях сухой степи. В ходе проделанной работы даны практические рекомендации по посадке хвойных деревьев кустарников для целей озеленения. In the Volgograd region, the only native representative of coniferous woody plants is J. sabina L., the existence of a population of one representative of coniferous plants indicates the homogeneity of the dendroflora, which can lead to the destruction of the ecosystem as a whole. Plant introduction as a tool on the way to achieving dendroflora biodiversity is the most practical and promising method in the conditions of the dry steppe. The aim of the study was to conduct a bioecological assessment of the life condition of coniferous woody plants, as well as to determine the degree of introduction resistance in the conditions of the dry steppe. Six introduced woody plants were evaluated in the dendrocollections of the Federal Research Center of Agroecology of the Russian Academy of Sciences: Juniperus virginianaL., J. communis L., J. sabina L., Thuja occidentalis L, Platycladus orientalis (L.) Franco, Pseudotsuga menziesii (Milb) Franco. The timing of the onset and duration of the main phenological phases were determined by the method of phenological observations of HBS. With the deviation of the average annual air temperature above the norm by 1.05 ° C and the annual precipitation of 75% of the norm, the duration of the vegetation period was 58 days for J. sabina L., 41 days for J. communis L., 55 days for Pseudotsuga menziesii (Milb) Franco, 56 days for J. virgiana L., 71 days for T. occidentalis L., and 68 days for P. orientalis (L.) Franco. As part of the ecological and biological assessment, such indicators as winter hardiness, drought resistance, the nature of dusting and seed-bearing were studied. Separately, the seed material was examined by the method of determining the mass of 1000 seeds. There was also an assessment of decorativeness, which determined the specifics of the use of a particular type for landscaping purposes. As a result of the conducted studies, the values of the acclimatization number for each species were calculated, according to which the degree of introduction resistance in the conditions of the dry steppe was determined. In the course of the work done, practical recommendations are given for planting coniferous trees and shrubs for landscaping purposes.

scholarly journals Specifics of propagation of coniferous plants in nurseries of the federal research center of agroecology of the russian academy of sciences

2020 ◽  
pp. 18-55
Author(s):  
Д.В. Сапронова ◽  
А.А. Долгих ◽  
М.В. Цой ◽  
В.В. Сапронов
Keyword(s):  
Pseudotsuga Menziesii ◽  
Tree Species ◽  
Woody Plants ◽  
Juniperus Virginiana ◽  
Thuja Occidentalis ◽  
Platycladus Orientalis ◽  
Picea Pungens ◽  
Planting Material ◽  
Academy Of Sciences ◽  
Selection Of

В связи с реализацией мероприятий национальных проектов «Наука», «Экология» остро стоят вопросы обеспечения посадочным материалом адаптированных древесных видов лесовосстановительных работ на деградированных территориях засушливых территорий. Цель исследований – разработка перспективных технологий размножения хвойных таксонов для лесомелиорации и озеленения с учетом их репродуктивных особенностей в засушливых условиях. Объекты исследований: лжетсуга Мензиеза (Pseudotsuga menziesii (Mirb.) Franco.), можжевельник виргинский (Juniperus virginiana L.), м. казацкий (sabinaL.), туя западная (Thuja occidentalis L.), плосковеточник восточный (Platycladus orientalis (L.) Franco), ель колючая ф. сизая (Picea pungens Engelm f. glauca Beissn.) коллекций, питомников, маточников Нижневолжской станции по селекции древесных пород – филиала ФНЦ агроэкологии РАН (кадастр. № 34:36:000014:178). Научные исследования направлены на решение теоретических и методических вопросов получения посадочного материала из адаптивного поколения древесных растений на основе изучения их репродуктивной способности. Выявлено качественные и количественные параметры семеношения и влияние лимитирующих факторов среды на развитие семян. Установлены особенности семенного размножения представителей древесных растений (хвойные таксоны) и разработаны технологические аспекты вегетативного размножения в условиях питомника Нижневолжской станции по селекции древесных пород (Волгоградская обл., Камышин) и комплекс мероприятий, обеспечивающих выращивание стандартного посадочного материала за один вегетационный период. Этот важный технологический прием в 2,8 раза увеличивает выход сеянцев с единицы площади, 87 % сеянцев достигают стандартных размеров, в 6 раз увеличивается абсолютно сухая масса сеянца. Внедрение научных разработок проводилось на производственных питомниках Нижневолжской станции по селекции древесных пород. В 2019 году было реализовано сеянцев и саженцев на сумму 6771024,12 рублей. Даны прогнозные предложения по развитию объекта – обновление производственной инфраструктуры станции, в т.ч. реконструкция питомника с целью формирования фонда посадочного материала для воспроизводства и использования коллекций биоресурсов деревьев и кустарников многоцелевого назначения. In connection with the implementation of the activities of the national projects "Science" and "Ecology", there are urgent issues of providing planting material for adapted wood types of reforestation in degraded areas of arid territories. The aim of the research is to develop promising technologies for breeding coniferous taxa for forest reclamation and landscaping, taking into account their reproductive characteristics in arid conditions. Research objects: Pseudotsuga menziesii (Mirb.) Franco.), Virginia juniper(Juniperus virginiana L.), M. kazatsky (J. sabina L.), Western thuja (Thuja occidentalis L.), Eastern flatwort (Platycladus orientalis (L.) Franco), prickly spruce (Picea pungens Engelm f. glauca Beissn.) collections, nurseries, brooders of the Nizhnevolzhskaya station for the selection of tree species – branch of the Federal Scientific Centre of Agroecology of the Russian Academy of Sciences (cadastre. № 34:36:000014:178). Scientific research is aimed at solving theoretical and methodological issues of obtaining planting material from the adaptive generation of woody plants based on the study of their reproductive ability. The qualitative and quantitative parameters of seed production and the influence of limiting environmental factors on the development of seeds were revealed. The features of seed reproduction of representatives of woody plants (coniferous taxa) and the technological aspects of vegetative propagation in a kennel Nizhnevolzhsky station on selection of tree species (Volgograd region, Kamyshin) and a set of activities to ensure the cultivation of standard planting material for one growing season. This important technological technique increases the yield of seedlings per unit area by 2.8 times, 87 % of seedlings reach standard sizes, and the absolutely dry weight of the seedling increases by 6 times. The introduction of scientific developments was carried out at the production nurseries of the Nizhnevolzhskaya station for the selection of tree species. In 2019, seedlings and saplings were sold for the amount of 677,1024. 12 rubles. Forecast proposals for the development of the facility are given – updating the production infrastructure of the station, including the reconstruction of the nursery in order to form a Fund of planting material for the reproduction and use of collections of bioresources of trees and shrubs for multi-purpose purposes.

scholarly journals Urban Dendroflora of the Macedonia Park in the City of Skopje, North Macedonia

2019 ◽  
Vol 2 (3) ◽  
pp. 10-28
Author(s):  
Martina Shotaroska ◽  
Bojan Simovski ◽  
Tomcho Nikolovski ◽  
Katerina Chonevska ◽  
Ivan Minčev ◽  
...  
Keyword(s):  
Woody Plants ◽  
Field Research ◽  
Woody Species ◽  
Pinus Nigra ◽  
Capital City ◽  
Cupressus Sempervirens ◽  
Hedera Helix ◽  
Platycladus Orientalis ◽  
Ecological Features ◽  
Juniperus Scopulorum

Subject of research in this article is the urban dendroflora of the Macedonia Park, situated on about 50,000 m2 in the Macedonian capital city of Skopje, i.e., identification and presence of the recent woody plants. Thus, observed are morphological and ecological features of the woody plants and their current state in this urban environment. The investigation relates to a seven-year period (since the establishment of the Park in 2012 up to late 2019). After the field research and the inventorisation of the woody plants in the Park, 82 taxa were identified, represented in 1,318 individuals. Most represented tree species is the hybrid Platanus × hispanica Mill. ex Münchh. with 103 individuals (7.81% of the overall urban dendroflora). Most frequent tree including infraspecific taxa is Fraxinus excelsior L. (including F. e. ‘Globosa’, F. e. ‘Jaspidea’, and F. e. ‘Pendula’) with a total number of 146 individuals (11.08%). Concerning other growth form, the mini and small tree roses of hybrid Rosa Floribunda Group outnumber all ornamental woody species with 225 bushes (17.07%). Climbers are represented with 3 taxa (3.66% of identified taxa) in pergolas (Wisteria sinensis /Sims/ Sweet, Parthenocissus quinquefolia /L./ Planch.), and wire cage topiary (Hedera helix L.). Likewise, 87 individuals (6.60%) of 10 species (12.19%) occur as remnants of the greening in the past of which 3 species are used as a green core of a small sacral architecture: Cupressus sempervirens var. horizontalis (Mill.) Loudon (with 10 trees), Platycladus orientalis (L.) Franco (3), and Pinus nigra J.F.Arnold (1). In general, the urban dendroflora is properly selected and used for greening, although certain species and individuals are withering (e.g. Betula pendula ‘Youngii’, Juniperus scopulorum ‘Skyrocket’, F. e. ‘Jaspidea’) or unsuitably used for avenue and in small alpine-like garden.

scholarly journals Ecological and botanical features of the railroads flora of the Middle Volga Region

2018 ◽  
Vol 7 (1) ◽  
pp. 91-97
Author(s):  
Nikolay Alexandrovich Nikitin
Keyword(s):  
Alien Species ◽  
Decisive Role ◽  
Volga Region ◽  
Individual Growth ◽  
Middle Volga Region ◽  
Biological Features ◽  
Railroad Tracks ◽  
Ecological Features ◽  
Functional Zones ◽  
Middle Volga

The paper summarizes the study of ecological characteristics of the Railways flora in the Middle Volga Region. The author comes to the conclusion that in most cases there arent any significant differences between aboriginal and alien species of the Railways flora, as well as their settlement of functional zones. The most significant differences have been recorded between aboriginal and alien species in the addition of families, which in turn does not have a decisive role in their addition to the flora as a whole. The author thinks that ecological features of the territory of individual growth are more important than biological features of species and families in the formation of the Railways flora. The developed scale of oppression allowed to determine characteristics of a particular individual. In the course of the research the dependence between the degree of oppression of plant organisms and the distance to the railroad tracks was established. The author found no significant differences in reactogenicity between the indigenous and alien species at active human impact on the Railways - both groups showed similar trends of oppression.

scholarly journals BIOLOGICAL AND ECOLOGICAL FEATURES OF THE SAXAUL-EATING SHEEPSHANKS (COLEOPHORIDAE)

2020 ◽  
Vol 2 (338) ◽  
pp. 62-68
Author(s):  
N. T. Tumenbaeva ◽  
B. K. Mоmbayeva ◽  
D. А. Smagulova ◽  
F. S. Mendigaliyeva
Keyword(s):  
Species Composition ◽  
Seed Production ◽  
Pest Species ◽  
Agricultural Engineering ◽  
Biological Features ◽  
South Eastern ◽  
Ecological Features ◽  
Natural Pasture ◽  
Pasture Grasses ◽  
Desert Zone

Within pests (insects), Lepidoptera, by species composition and harmfulness, are in the front row. As you know, one of the biogenic factors in nature, they have a serious impact on the yield of natural pasture grasses and saxaul. They feed on leaves, stems, roots, flowers and seeds of plants, and prevent the reproduction of saxaul. In this regard, it is now necessary to study the biological characteristics of shells that feed on saxaul, determine the phenology, harmfulness, and organize measures to protect against pests. For many reasons (seed production, agricultural engineering, etc.), it is connected with the fact that in the desert zone of South-Eastern and southern Kazakhstan, issues of increasing the area of the saxaul and protecting it from pests are being solved. One of the main reasons is an incomplete study of the species composition of insects-insects that feed on saxaul. Therefore, the study of bioecological features of pest species and their harmfulness and measures to protect the saxaul from pests is one of the urgent problems. The article deals with the study of biological features of shells that feed on saxaul, determining the phenology, harmfulness and organization of measures to protect against pests.

Colpoma crispum. [Descriptions of Fungi and Bacteria].

1997 ◽  
Author(s):  
D. W. Minter
Keyword(s):  
Picea Abies ◽  
Geographical Distribution ◽  
Northern Hemisphere ◽  
Pseudotsuga Menziesii ◽  
Late Summer ◽  
Juniperus Virginiana ◽  
North West ◽  
Early Autumn

Abstract A description is provided for Colpoma crispum. Information is included on the disease caused by the organism, its transmission, geographical distribution, and hosts. DISEASE: On dead, rather brittle twigs of Picea abies, but usually attached but sometimes fallen by the time ascomata contain ascospores. Probably involved in self-pruning of the tree, but associated with lichen colonies unlike species of Therrya on Pinus (IMI Descriptions 1297 and 1298), and Colpoma on Quercus (IMI Description 942) which occur on twigs without lichen colonies. HOSTS: Juniperus virginiana (twig), Larix sp. (bark, twig), Picea abies (bark, twig), Picea sp. (bark), Pseudotsuga menziesii (twig). GEOGRAPHICAL DISTRIBUTION: Germany, Italy, Sweden, UK (England, Scotland, Wales), Ukraine, USA (Oregon). Unsuccessful searches in north-west Poland. Altitude records exist up to 950m (Ukraine). TRANSMISSION: By air-borne ascospores in humid conditions. In the temperate northern hemisphere, ascocarps probably mostly open in late summer and early autumn.

Absorption, Translocation, and Degradation of Tebuthiuron and Hexazinone in Woody Species

Weed Science ◽  
1984 ◽  
Vol 32 (6) ◽  
pp. 739-743 ◽  
Author(s):  
Wayne K. McNeil ◽  
Jimmy F. Stritzke ◽  
Eddie Basler
Keyword(s):  
Pinus Taeda ◽  
Loblolly Pine ◽  
Woody Species ◽  
Black Walnut ◽  
The Other ◽  
Juniperus Virginiana ◽  
Eastern Redcedar ◽  
Quercus Macrocarpa ◽  
Root Absorption ◽  
Bur Oak

Seedlings of winged elm (Ulmus dataMichx.), bur oak (Quercus macrocarpaMichx.), black walnut (Juglans nigraL.), eastern redcedar (Juniperus virginianaL.), and loblolly pine (Pinus taedaL.) were treated in nutrient solution with ring-labeled14C-tebuthiuron {N-[5-(1,1-dimethylethyl)-1,3,4-thiadiazol-2-yl]-N,N′-dimethylurea} or14C-hexazinone [3-cyclohexyl-6-(dimethylamino)-1-methyl-1,3,5-triazine-2,4(1H,3H)-dione]. Four hours later,14C was detected in all sections of winged elm treated with14C-tebuthiuron and14C-hexazinone. Root absorption of the tebuthiuron label by the other species occurred in the order: loblolly pine > bur oak > black walnut = eastern redcedar. The sequence of14C-hexazinone absorption was: loblolly pine > black walnut ≥ bur oak = eastern redcedar. Foliar accumulation of the tebuthiuron label occurred in the order: bur oak > loblolly pine > eastern redcedar = black walnut, whereas the sequence with hexazinone was loblolly pine > bur oak > black walnut = eastern redcedar. The presence of the three metabolites of hexazinone in loblolly pine suggests that it may be resistant to hexazinone as a result of its ability to degrade hexazinone rather than its ability to limit uptake.

scholarly journals Visible Foliar Injury and Physiological Responses to Ozone in Italian Provenances ofFraxinus excelsiorandF. ornus

2007 ◽  
Vol 7 ◽  
pp. 90-97 ◽  
Author(s):  
Nicla Contran ◽  
Elena Paoletti
Keyword(s):  
Gas Exchange ◽  
Physiological Responses ◽  
Carbon Assimilation ◽  
Woody Species ◽  
Green Ash ◽  
Foliar Injury ◽  
Visible Injury ◽  
Geographical Variations ◽  
Ecological Features ◽  
Visible Foliar Injury

We compared leaf visible injury and physiological responses (gas exchange and chlorophyll a fluorescence) to high O3exposure (150 nmol mol–1h, 8 h day–1, 35–40 days) of two woody species of the same genus with different ecological features: the mesophilic green ash (Fraxinus excelsior) and the xerotolerant manna ash (F. ornus). We also studied how provenances from northern (Piedmont) and central (Tuscany) Italy, within the two species, responded to O3exposure. Onset and extent of visible foliar injury suggested thatF. excelsiorwas more O3sensitive thanF. ornus. The higher stomatal conductance inF. ornusthan inF. excelsiorsuggested a larger potential O3uptake, in disagreement to lower visible foliar injury. The higher carbon assimilation inF. ornussuggested a higher potential of O3detoxification and/or repair. Contrasting geographical variations of ash sensitivity to O3were recorded, as Piedmont provenances reduced gas exchange less than Tuscan provenances inF. excelsiorand more inF. ornus. Visible injury was earlier and more severe inF. excelsiorfrom Piedmont than from Tuscany, while the provenance did not affect visible injury onset and extent inF. ornus.

Control of Oaks (Quercusspp.) and Associated Woody Species on Rangeland with Tebuthiuron

Weed Science ◽  
1981 ◽  
Vol 29 (3) ◽  
pp. 270-275 ◽  
Author(s):  
C. J. Scifres ◽  
J. W. Stuth ◽  
R. W. Bovey
Keyword(s):  
Woody Species ◽  
Juniperus Virginiana ◽  
Eastern Redcedar ◽  
The Third ◽  
Growing Seasons ◽  
Post Oak ◽  
Ilex Vomitoria ◽  
Ulmus Alata ◽  
Quercus Stellata ◽  
Water Oak

Aerial applications of 20% tebuthiuron {N-[5-(1,1-dimethylethyl)-1,3,4-thiadiazol-2-yl]-N,N-dimethylurea} pellets at 2.2 kg/ha (ai) in the spring effectively controlled post oak (Quercus stellataWangenh.), blackjack oak (Q. marilandicaMuenchh.), water oak (Q. nigraL.), yaupon (Ilex vomitoriaAit.), winged elm (Ulmus alataMichx.), downy hawthorn (Crataegus mollisScheele), gum bumelia [Bumelia lanuginosa(Michx.) Pers.], and willow baccharis (Baccharis salicinaTorr. & Gray) in the Post Oak Savannah of Texas. Tree huckleberry (Vaccinium arboreumMarsh.), black hickory (Carya texanaBuckl.), honeylocust (Gleditsia triachanthosL.) and cedar elm (Ulmus crassifoliaNutt.) were partially controlled by 2.2 kg/ha of tebuthiuron. Canopies of buckbrush (Symphoricarpos orbiculatusMoench), southern dewberry (Rubus trivialisMichx.), American beautyberry (Callicarpa americanaL.), and persimmon (Diospyros virginianaL.) were reduced for about two growing seasons after which the woody species recovered. American beautyberry appeared to increase in abundance by the third growing season after control of the other woody species. Honey mesquite [Prosopis juliflora(Swartz) DC. var.glandulosa(Torr.) Cockerell], eastern redcedar (Juniperus virginianaL.), and Texas persimmon (Diospyros texanaScheele) were not controlled by tebuthiuron at 2.2 or 4.4 kg/ha, and saw greenbrier (Similax bona-noxL.) and peppervine [Ampelopsis arborea(L.) Koehne] apparently increased following application of tebuthiuron.

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