scholarly journals Assessment of resistance of grape varieties to mildew in the steppe zone of the Lower Volga region

2020 ◽  
pp. 34-39
Author(s):  
Nikita Valeryevich Ryazantsev ◽  
Yuriy Borisovich Ryabushkin ◽  
Ivan Dmitrievich Eskov

In the article the results of studying the peculiarities of mildew development by the macroscopic diagnostics method on the examples of 33 varieties and hybrid grapes forms in the conditions of the steppe zone of the Lower Volga Area have been reported. Indicators of the maximum infection of leaves, inflorescences and medium infection of vegetative and reproductive organs were characterized by the greatest degree of susceptibility to mildew. The degree of mildew’s distribution and development changed from year to year depending on the current year weather conditions and the features of its development in the previous year. During the seven-year period of observations three years were characterized by epiphytoties mildew. As a result of studying of grapes resistance to mildew, groups of irresistant, tolerant and resistant varieties have been distinguished.

2018 ◽  
pp. 24-28
Author(s):  
N.V. Ryazantsev ◽  
◽  
Yu.B. Ryabushkin ◽  
I.D. Eskov ◽  
S.V. Morozova ◽  
...  

2015 ◽  
Vol 48 (3) ◽  
pp. 294-302 ◽  
Author(s):  
N. N. Kashirskaya ◽  
T. E. Khomutova ◽  
E. V. Chernysheva ◽  
M. V. El’tsov ◽  
V. A. Demkin

Author(s):  
Elmira I. Kaybeleva ◽  
◽  
Ekaterina A. Arkhipova ◽  
Olga I. Yudakova ◽  
Maxim Yu. Voronin ◽  
...  

Poa bulbosa L. is a native cereal of the European and Mediterranean flora and an invasive species in North America. The study of its reproductive strategy in different environmental and climatic conditions is important for the development of effective methods of containment and prevention of invasions. Plants of two coenopopulations were investigated embryologically. In addition, the morphology of reproductive organs was analyzed in 175 herbarium specimens collected in the flora of the Lower Volga region from 1919 to 2017. It was found that in the steppe phytocenoses of the Lower Volga region P. bulbosa reproduce mainly vegetatively by basal bulbs and pseudoviviparous bulblets. Rarely, seed mode reproduction in the form of facultative apomixis is realized. There was no dependence of the mode of reproduction (pseudovivipary / seed reproduction) on the date of growing season beginning and on the average temperature in the period from the beginning of the growing season to flowering. The effectiveness of pseudovivipary is low due to the aridity of the Lower Volga region climate. Bulblets germinate in inflorescences and then dry. This holds back the P. bulbosa wider distribution in the studied region.


2009 ◽  
Vol 42 (5) ◽  
pp. 536-542 ◽  
Author(s):  
N. N. Kashirskaya ◽  
T. E. Khomutova ◽  
T. S. Demkina ◽  
V. A. Demkin

2016 ◽  
Vol 1 (4) ◽  
pp. 9-13
Author(s):  
Еськов ◽  
Ivan Eskov ◽  
Мельников ◽  
Aleksey Melnikov ◽  
Теняева ◽  
...  

The purpose of the research is to reveal the features of influence of abiotic factors on the melliferous capacity of the base field rotations and the productivity of bee families in the period of maintenance and the main honey flow in conditions of the Volga region. The experience was laid in 2012-2014 in the Saratov CIS-Volga region, in the town of Balashov. The air temperature was taken into account on the basis of his own observations, and was also used meteorological data of the weather station. In the flowering period of crops daily recorded daily air temperature (1200 hours). The results of observations of the honey yield of honeybees (Krajina breed of bees (karnika) – Apis mellifera carnica Pollm.) in the flowering period of the main agricultural crops – nectarines (legumes, Cruciferae and Polygonaceae) in the steppe zone of the Volga region. The studies were conducted in a stationary apiary, located at 100-150 m from the agrocoenosis. Provides data of daily gain or loss of honey from control hives. Tendencies of influence of meteorological conditions when applying temperature, rainfall and other abiotic factors on the data of the gain control of the honey of the hive in the steppe zone of the Lower Volga region. The highest intensity of the honey production by bees (1375,0-1428,5 g/day) is the daily air temperature is 26±0,70 C, humidity 57-59%, against short-term precipitation and wind speed of 2.8-3.2 m/s. Period sustainable honey collection, including the main honey collection (July 10 – August 10), coincides geographically with prevailing cold North and northeast winds, the negative effects of which are offset by the terrain of the steppe zone of the Lower Volga region.


2019 ◽  
pp. 46-55
Author(s):  
С.Е. ЛАЗАРЕВ ◽  
А.В. СЕМЕНЮТИНА

Родовой комплекс Robinia L. представляет большой интерес для мобилизации генетических ресурсов в лесозащитные и озеленительные насаждения аридного региона. В настоящее время широкое распространение в озеленении и лесомелиорации на юге страны получил только один вид робинии Robinia pseudoacacia L. ( Р. лжеакация, или белая акация). Объектами исследований стали виды и формы рода Robinia: R. viscosa Vent. R. luxurians (Dieck) S.K. Schneid. R. pseudoacacia L. R. pseudoacacia f. pyramidalis (Pepin) Rehd. R. pseudoacacia f. unifoliola (Talou) Rehd. R. pseudoacacia f. umbraculifera (DC) Rehd., интродуцированные в дендрологических коллекциях Волгоградской области: ФНЦ агроэкологии РАН, кадастр 34:34:000000:122, 34:34:060061:10 и Нижневолжской станции по селекции древесных пород, 34:36:0000:14:0178. Цель работы изучить особенности роста и развития видов и форм рода Robinia в условиях интродукции и определить отношение к лимитирующим экологическим факторам сухостепной зоны Нижнего Поволжья. В результате проведенных исследований были установлены особенности роста и развития видов и форм рода Robinia в условиях интродукции, выявлены экологические закономерности формирования плодов и семян, определены пороговые значения климатических факторов по отношению к процессам жизнедеятельности, установлены особенности ростовых процессов в засушливых условиях. Выявлено, что основными факторами, лимитирующими процессы адаптации видов и форм рода Robinia в сухостепных условиях Нижнего Поволжья, является засуха и экстремально высокие и низкие температуры воздуха (40, 43). Толерантность растений к данным климатическим факторам является важным показателем успешности их интродукции. Исследования показывают, что существовавшие ранее различия в степени морозостойкости и засухоустойчивости между видами в процессе постепенной адаптации значительно сократились. Данный факт объясняется высокими темпами адаптации Robinia pseudoacacia к лимитирующим факторам окружающей среды. Еще недавно критической для этого вида считалась температура воздуха 25С. Как показали наши исследования, этот порог в процессе акклиматизации значительно снизился и составляет 37С. Все изучаемые виды робинии имеют относительно высокую степень зимостойкости в условиях сухостепной зоны Нижнего Поволжья. Менее зимостойкими оказались только декоративные формы Robinia pseudoacacia f. pyramidalis (Pepin) Rehd. и Robinia pseudoacacia f. umbraculifera (DC) Rehd., размножаемые в культуре преимущественно вегетативным способом. Определено, что робиния может успешно выращиваться в разных почвенногеографических районах сухостепной зоны Нижнего Поволжья. Максимальных размеров и долговечности насаждения из робинии достигают на черноземных почвах. Высота насаждений в 20летнем возрасте составляет 912 м. Посадки на темнокаштановых почвах к 20летнему возрасту достигают 810 метровой высоты, а на светлокаштановых 56 метров. The generic complex Robinia L. is great interest for the mobilization of genetic resources in forest protection and landscaping of the arid region. Currently wide spread in planting and forest reclamation in the South received only one kind of locust Robinia pseudoacacia L. ( R. leachate, or black locust). The objects of research were species and forms of the genus Robinia: R. viscosa Vent. R. luxurians (Dieck) S. K. Schneider. R. pseudoacacia L. R. pseudoacacia f. pyramidalis (Pepin) Rehd. R. pseudoacacia f. unifoliola (Talou) Rehd. R. pseudoacacia f. umbraculifera (DC) Rehd., introduced in the dendrological collections of the Volgograd region: FSC Agroecology RAS, cadastral number 34:34:000000:122, 34:34:060061:10 and the lower Volga station for selection of wood species, 34:36:0000:14:0178. The aim of the work is to study the features of growth and development of species and forms of the genus Robinia in terms of introduction and to determine the attitude to the limiting environmental factors of the dry steppe zone of the Lower Volga Region. As a result of the research, the features of the growth and development of species and forms of the genus Robinia in terms of introduction were established, the ecological regularities of the formation of fruits and seeds were revealed, the threshold values of climatic factors in relation to the processes of life were determined, the features of growth processes in arid conditions were established. It was found that the main factors limiting the adaptation of species and forms of the genus Robinia in the dry steppe conditions of the Lower Volga region is drought and extremely high and low air temperatures (40, 43). Tolerance of plants to these climatic factors is an important indicator of the success of their introduction. Studies show that preexisting differences in frost and drought resistance between species have been significantly reduced through gradual adaptation. This fact is explained by the high rate of adaptation of Robinia pseudoacacia to the limiting factors of the environment. Until recently, the air temperature of 25C was considered critical for this species. As our studies have shown, this threshold in the process of acclimatization has significantly decreased and is 37C. All studied species of Robinia have a high degree of winter hardiness in the dry steppe zone of the Lower Volga region. Less hardy turned out to be only ornamental forms of Robinia pseudoacacia f. pyramidalis (Pepin) Rehd. and Robinia pseudoacacia f. umbraculifera (DC) Rehd., propagated in culture mainly vegetative way. It is determined that Robinia can be successfully grown in different soilgeographical areas of the dry steppe zone of the Lower Volga region. Maximum size and longevity of the plantings of locust reach on Chernozem soils. The height of the plantings in the 20yearold whoplant is 912 m. Planting on dark chestnut soils to 20yearold reach 810 meter height, and on light chestnut56 meters.


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