2013 ¹3
GENETICS, BREEDING, STUDY OF VARIETIES
Abstract
The results of the evaluation of apricot varieties based on their yield in conditions of
the Southern Steppe of Ukraine are given. Variety samples of early maturing period Yubileiniy
Fedchenkovoy, Melitopolsky 17705, A-30081, medium maturing variety Olimp and late
maturing hybrid form A-30230 with high adaptive potential have been chosen. These
varieties are perspective for planting in the industrial orchards, and are also used in the
selection for creation highly productive forms. Varieties that are interesting for modern
intensive orchards are the following ones: Melitopol hybrid form A-30230, Crimean variety
Olimp, and also Donetsk varieties Lyubimets Zinaidy, Donetskiy ranny, and foreign Borsi
rozsa., if they are protected against spring frosts and Manilia.
the Southern Steppe of Ukraine are given. Variety samples of early maturing period Yubileiniy
Fedchenkovoy, Melitopolsky 17705, A-30081, medium maturing variety Olimp and late
maturing hybrid form A-30230 with high adaptive potential have been chosen. These
varieties are perspective for planting in the industrial orchards, and are also used in the
selection for creation highly productive forms. Varieties that are interesting for modern
intensive orchards are the following ones: Melitopol hybrid form A-30230, Crimean variety
Olimp, and also Donetsk varieties Lyubimets Zinaidy, Donetskiy ranny, and foreign Borsi
rozsa., if they are protected against spring frosts and Manilia.
Abstract
The results of variety investigation of 16 introduced peach varieties are given. As result
of pomological evaluation, varieties Harrow Beauty, Kaprise, Corindîr, and Montar have
demonstrated the highest quality of fruit.
of pomological evaluation, varieties Harrow Beauty, Kaprise, Corindîr, and Montar have
demonstrated the highest quality of fruit.
Abstract
The article gives an agrobiological description of new peach varieties of NBS-NSC
breeding, which have been included in the Register of Plant Varieties of the Ukraine and
patented.
breeding, which have been included in the Register of Plant Varieties of the Ukraine and
patented.
Abstract
Plum and cherry plum varieties have been studied. The results are presented.
Promising varieties according to a complex of features and varieties-donors for breeding have
been selected.
Promising varieties according to a complex of features and varieties-donors for breeding have
been selected.
Abstract
One of the main problems occuring during the cultivation of plum in the Moscow
region is connected with the insufficient resistance of its flower buds to frosts in severe
winter. Such winters happen in this region once in 25…30 years and they are characterized by
late autumn frosts, maximum frosts in the middle of winter, abrupt and gradual frosts after
thaw in late winter. Plum yield capacity is in no small measure determined by the
sustainability of its flower buds to frosts, or their winter hardiness according to the
components: 1, 2, 3 and 4. This article presents an assessment of flower bud hardiness of
different types of plums by components 2, 3 and 4, the identification of the most winter-hardy
varieties according to these components has become the main of this article.
region is connected with the insufficient resistance of its flower buds to frosts in severe
winter. Such winters happen in this region once in 25…30 years and they are characterized by
late autumn frosts, maximum frosts in the middle of winter, abrupt and gradual frosts after
thaw in late winter. Plum yield capacity is in no small measure determined by the
sustainability of its flower buds to frosts, or their winter hardiness according to the
components: 1, 2, 3 and 4. This article presents an assessment of flower bud hardiness of
different types of plums by components 2, 3 and 4, the identification of the most winter-hardy
varieties according to these components has become the main of this article.
Abstract
As a result of the long-term studying of 18 stock/scion plum combinations the essential
influence of a stock on the basic economic-biological parameters of grafted trees has been
determined. Clonal stocks Novelty, ÎÐÀ-15-2, ÎÐ-23-23, which raise the productivity and
stability of fructification of plum cultivars, have been allocated in comparison with seed
stocks. Utro and Yaishnaya sinyaya on OPA-15-2 stock (37 t / ha and 27 t / ha, respectively),
and Skoroplodnaya on OP-23-23 (33 t / ha) gave the maximum yields. The replacement of
seed stocks for clonal stocks improved the stability coefficient from 0.6 to 0.8...0.9.
influence of a stock on the basic economic-biological parameters of grafted trees has been
determined. Clonal stocks Novelty, ÎÐÀ-15-2, ÎÐ-23-23, which raise the productivity and
stability of fructification of plum cultivars, have been allocated in comparison with seed
stocks. Utro and Yaishnaya sinyaya on OPA-15-2 stock (37 t / ha and 27 t / ha, respectively),
and Skoroplodnaya on OP-23-23 (33 t / ha) gave the maximum yields. The replacement of
seed stocks for clonal stocks improved the stability coefficient from 0.6 to 0.8...0.9.
Abstract
The estimation results for fungi disease resistance of 31 cherry varieties from different
research organizations during 9 years are given. Promising genotypes resistant to leaf spot,
brown rot and diseases complex have been picked up. Varieties Igritskaya and Spanka
bryanskaya have exposed high and stable resistance. Varieties Radonezh, Soyuznaya and
Novinka from the same group have been less stable from the resistance point of view.
Varieties Morel bryanskaya, Zastentchivaya, Pritchuda, Tchudo vishnya, Lubimitsa, Pamyati
Vavilova, etc. (infection was 1…1.4 point) are in the group of resistant and medium resistant
ones.
research organizations during 9 years are given. Promising genotypes resistant to leaf spot,
brown rot and diseases complex have been picked up. Varieties Igritskaya and Spanka
bryanskaya have exposed high and stable resistance. Varieties Radonezh, Soyuznaya and
Novinka from the same group have been less stable from the resistance point of view.
Varieties Morel bryanskaya, Zastentchivaya, Pritchuda, Tchudo vishnya, Lubimitsa, Pamyati
Vavilova, etc. (infection was 1…1.4 point) are in the group of resistant and medium resistant
ones.
Abstract
The results of observations of the terms of phenological phases for 40 varieties of sour
cherries in the South of the Ukraine for the period 2004...2010 are given, characteristics of
differentiation and organogenesis of generative buds for 14 varieties of sour cherries are specified.
It has been determined that varieties Ozhydanye and Amulet are the first ones to start
the differentiation of buds, variety Igrushka starts later. In conditions of the south of the
Ukraine the generative buds of the studied varieties in winter are in the seventh and eighth
stage of development.
Varieties with the extra-early (Melitopolska radist and Ranniy desert) and late (Kapriz,
Griot Turovtsevoi) fruit maturation terms have been selected. They are valuable for breeders
as initial forms, as well as for fruit crop producers.
cherries in the South of the Ukraine for the period 2004...2010 are given, characteristics of
differentiation and organogenesis of generative buds for 14 varieties of sour cherries are specified.
It has been determined that varieties Ozhydanye and Amulet are the first ones to start
the differentiation of buds, variety Igrushka starts later. In conditions of the south of the
Ukraine the generative buds of the studied varieties in winter are in the seventh and eighth
stage of development.
Varieties with the extra-early (Melitopolska radist and Ranniy desert) and late (Kapriz,
Griot Turovtsevoi) fruit maturation terms have been selected. They are valuable for breeders
as initial forms, as well as for fruit crop producers.
Abstract
As a result of the scientific research work with Lonicera caerulea L.and Hippophae
ramnoides L. in conditions of the Southern Urals (Chelyabinsk) more than 8,831 thousand
hybrid plants have been studied. A register of optimum donors and potential sources has been
created. More than 23 varieties have been developed, 14 of which have been included in the
National Register: Amazon, Bazhovsky, Volschebnisa, Dlinnoplodnaya, Elizabeth, Isuminka,
Lasurit, Lenita, Sineglazka, Sinilga, Stoykay, Fianit, Chelyabinka, Chernichko. Promising hybrid
families have been identified and new elites and cultivars have been obtained.
ramnoides L. in conditions of the Southern Urals (Chelyabinsk) more than 8,831 thousand
hybrid plants have been studied. A register of optimum donors and potential sources has been
created. More than 23 varieties have been developed, 14 of which have been included in the
National Register: Amazon, Bazhovsky, Volschebnisa, Dlinnoplodnaya, Elizabeth, Isuminka,
Lasurit, Lenita, Sineglazka, Sinilga, Stoykay, Fianit, Chelyabinka, Chernichko. Promising hybrid
families have been identified and new elites and cultivars have been obtained.
Abstract
The analysis of the productivity of introduced varieties of Lonicera L. has been made to
determine the assessment of the environmental sustainability relative to the climatic factors
of the steppe zone of the Southern Urals. The estimation of honeysuckle berries by weight of
fruit and taste depending on the meteorological conditions has been given; the biochemical
composition of fruit has been studied.
For consistent high yields of Lonicera L. in the steppe zone of the Southern Urals it is
necessary to cultivate varieties Volkhov, Viola, Lebedushka, Amphora and Kamchadalka,
which are resistant to climatic stress factors.
determine the assessment of the environmental sustainability relative to the climatic factors
of the steppe zone of the Southern Urals. The estimation of honeysuckle berries by weight of
fruit and taste depending on the meteorological conditions has been given; the biochemical
composition of fruit has been studied.
For consistent high yields of Lonicera L. in the steppe zone of the Southern Urals it is
necessary to cultivate varieties Volkhov, Viola, Lebedushka, Amphora and Kamchadalka,
which are resistant to climatic stress factors.
Abstract
The article offers the results of studies of the mechanical fruit composition of berries of
98 gooseberry varieties of different genetic and geographic origin. The varieties with the best
mechanical composition parameters were selected for breeding purposes: for large weight of
berries: Bakhmutskiy, Russkiy Zheltyi, Chernoslivovyi, Krasnoslavyanskiy, Salut, Shchors,
Serafim, Kamenyar, Mleevskiy Krasnyi, Finik, Pushkinskiy, Malakhit, Rozovyi Ranniy, Ravolt,
Belorusskiy Sakharnyi; for stability of berry mass: Kuibyishevskiy Chernoplodnyi, Zor’ka,
Hinnonmainen Keltainen; for the least amount of seeds in berries: Michurinets, Ocharovanie,
Chernomor, Rozovyi Fonarik, Mleevskiy Zheltyi, Chernyi Negus, Sirius, Kazachok, Lankashirets; for a stable number of seeds per berry: Pushkinskiy; for the least number of
seeds per berry weight unit: Mleevskiy Zheltyi, Ocharovanie, Chernomor, Sirius, Sadko,
Eridan; for the smallest correlation between the weight of berry and seeds in it: Rozovyi
Fonarik, Belorusskiy Sakharnyi, Russkiy Zheltyi, Orlets, Berill, Rozovyi Ranniy, Sirius.
98 gooseberry varieties of different genetic and geographic origin. The varieties with the best
mechanical composition parameters were selected for breeding purposes: for large weight of
berries: Bakhmutskiy, Russkiy Zheltyi, Chernoslivovyi, Krasnoslavyanskiy, Salut, Shchors,
Serafim, Kamenyar, Mleevskiy Krasnyi, Finik, Pushkinskiy, Malakhit, Rozovyi Ranniy, Ravolt,
Belorusskiy Sakharnyi; for stability of berry mass: Kuibyishevskiy Chernoplodnyi, Zor’ka,
Hinnonmainen Keltainen; for the least amount of seeds in berries: Michurinets, Ocharovanie,
Chernomor, Rozovyi Fonarik, Mleevskiy Zheltyi, Chernyi Negus, Sirius, Kazachok, Lankashirets; for a stable number of seeds per berry: Pushkinskiy; for the least number of
seeds per berry weight unit: Mleevskiy Zheltyi, Ocharovanie, Chernomor, Sirius, Sadko,
Eridan; for the smallest correlation between the weight of berry and seeds in it: Rozovyi
Fonarik, Belorusskiy Sakharnyi, Russkiy Zheltyi, Orlets, Berill, Rozovyi Ranniy, Sirius.
Abstract
The studies have been carried out in the Irkutsk region. 12 varieties and 7 selections of
ever-bearing raspberry have been investigated. The studied genotypes have been estimated
according to the fruit ripening periods. The potential productivity of ever-bearing raspberry
has been characterized according to the weight of a berry in conditions of the south of Irkutsk
region. The perspective forms of ever-bearing raspberry have been selected for growing in the
studied region.
ever-bearing raspberry have been investigated. The studied genotypes have been estimated
according to the fruit ripening periods. The potential productivity of ever-bearing raspberry
has been characterized according to the weight of a berry in conditions of the south of Irkutsk
region. The perspective forms of ever-bearing raspberry have been selected for growing in the
studied region.
PHYSIOLOGY OF FRUIT CROPS
Abstract
The effects of different concentrations of contemporary preparations containing
physiologically active compounds – «Epin-extra» (action agent – epibrassinolid) and
«Tzirkon» (with hydroxycinnamon acids) on germination in vitro of pollen grains in remote
hybrids of cherry-plum and apricot have been researched. The using of this physiologically
active products in optimal concentration 0,01 ml/l supplemented in the artificial nutrient
media leads to the multiplication of quantity of germinated pollen in cherry-plum variety
Scythians’ Gold and apricot selection ¹22 at 1,8…9,4 times. The increased concentration 0,5
ml/l of each physiologically active product does not provide stimulated effects on the pollen
germination of these genotypes.
physiologically active compounds – «Epin-extra» (action agent – epibrassinolid) and
«Tzirkon» (with hydroxycinnamon acids) on germination in vitro of pollen grains in remote
hybrids of cherry-plum and apricot have been researched. The using of this physiologically
active products in optimal concentration 0,01 ml/l supplemented in the artificial nutrient
media leads to the multiplication of quantity of germinated pollen in cherry-plum variety
Scythians’ Gold and apricot selection ¹22 at 1,8…9,4 times. The increased concentration 0,5
ml/l of each physiologically active product does not provide stimulated effects on the pollen
germination of these genotypes.
PROTECTION OF PLANTS, PHYTOPATHOLOGY OF FRUIT CROPS
Abstract
The perspective of using biopreparations Gaupsin (Pseudomonas aureofaciens) and
Trichodermin (Trichoderma lignorum) in the system of peach protection against Taphrina
deformans Tul. and Clacterosporium carpophilum Aderh. is shown.
It was determined that twice-repeated spraying of peaches by biopreparations
hampers the spreading and development of Taphrina deformans by 14.9…26.5% and
2.9…8.3%, respectively, Clacterosporium carpophilum – 9.6…18.2 and 4.2…8.4%. The
effectivity of Gaupsin application (5.0 l/ha) and Trichdermin application (5.0 l/ha) was much
higher against Taphrina deformans than against Clacterosporium carpophilum and was
70…84%.
Trichodermin (Trichoderma lignorum) in the system of peach protection against Taphrina
deformans Tul. and Clacterosporium carpophilum Aderh. is shown.
It was determined that twice-repeated spraying of peaches by biopreparations
hampers the spreading and development of Taphrina deformans by 14.9…26.5% and
2.9…8.3%, respectively, Clacterosporium carpophilum – 9.6…18.2 and 4.2…8.4%. The
effectivity of Gaupsin application (5.0 l/ha) and Trichdermin application (5.0 l/ha) was much
higher against Taphrina deformans than against Clacterosporium carpophilum and was
70…84%.
Abstract
Shot-hole disease and fruit rot are the nucleus of diploid plum pathogenic complex.
Shot–hole disease is spread in nurseries, young and crop fruit-bearing plantations. The
resistance of 10 plum diploid cultivars to shot-hole disease agent has been studied. Immune
cultivars were not revealed in years of researches, a considerable proportion belonged to
poorly- and medium-affected cultivars. "The critical" periods of plant infection by disease
agents have been preliminary determined. Tortricid plum moth (Grapholitha funebrana) and
plum moth (Hyalopterus pruni) prevailed among pests on diploid plum.
Shot–hole disease is spread in nurseries, young and crop fruit-bearing plantations. The
resistance of 10 plum diploid cultivars to shot-hole disease agent has been studied. Immune
cultivars were not revealed in years of researches, a considerable proportion belonged to
poorly- and medium-affected cultivars. "The critical" periods of plant infection by disease
agents have been preliminary determined. Tortricid plum moth (Grapholitha funebrana) and
plum moth (Hyalopterus pruni) prevailed among pests on diploid plum.
BIOCHEMISTRY OF FRUIT CROPS
Abstract
The results of chemical and technological trials are given for red currant varieties
collection (36 selections) in conditions of the Central Black Soil Zone. The intervals of
displaying of the main biochemical indexes are shown. Promising varieties with the best
biochemical composition have been isolated. These varieties totally meet modern
requirements in chemical significance of the given crop: Asora, Vika, Viksne, Niva,
Osipovskaya, Jonkheer van Tets, Konservnaya krasnaya and Smo
collection (36 selections) in conditions of the Central Black Soil Zone. The intervals of
displaying of the main biochemical indexes are shown. Promising varieties with the best
biochemical composition have been isolated. These varieties totally meet modern
requirements in chemical significance of the given crop: Asora, Vika, Viksne, Niva,
Osipovskaya, Jonkheer van Tets, Konservnaya krasnaya and Smo
Abstract
Biochemical composition of fruit of 81 bullace plum varieties was studied at the
Pavlovsk Experimental Station in the vicinities of St. Petersburg from 1982 through 2012. The
varietal peculiarities of biochemical compound accumulation were evaluated relative to the
dates of fruit ripening. The fruit biochemical composition data were used for selecting
varieties for breeding purposes and for practical use. In the group of early-ripening ones, such
varieties as Zarechnaya Rannyaya, Kressu, Polli Varane, Renclod Pavlovsky, Sverkhrannaya
and Startovaya were identified. The least variation in a chemical component content (V) was
observed in Polli Varane, RenclodPavlovsky and Startovaya. The varieties identified in the
group of mid-ripening plums included Ave, Amitar, Norgen, Garmonia, Renclod Urozhainy,
Sizy Golubok, Skorospelka Novaya and Experimentalor. A weak variation in the chemical
component content was observed in SizyGolubok, Skorospelka Novaya and Nagrada. The
varieties identified in the group of medium-late plums included Kosmos, Luzhskaya Krasnaya,
Korneevskaya 83, Pamyat Khasanova, Renclod Tenkovsky, Kantemirovskaya, Vicana and
Vilnor. The least variation in the chemical component composition was observed in
Azhanskaya from Ogre, Vikana, Kantemirovskaya, Luzhskaya Krasnaya and Renklod
Tenkovsky. The selected late-ripening varieties included Porosl from Ostashkov,
Experimentalstetter and Solotovskaya Pozdnyaya. A weak variation in the chemical
component content was observed in Solotovskaya Pozdnyaya, Tulskaya Chernaya and
Experimentalstetter.
Pavlovsk Experimental Station in the vicinities of St. Petersburg from 1982 through 2012. The
varietal peculiarities of biochemical compound accumulation were evaluated relative to the
dates of fruit ripening. The fruit biochemical composition data were used for selecting
varieties for breeding purposes and for practical use. In the group of early-ripening ones, such
varieties as Zarechnaya Rannyaya, Kressu, Polli Varane, Renclod Pavlovsky, Sverkhrannaya
and Startovaya were identified. The least variation in a chemical component content (V) was
observed in Polli Varane, RenclodPavlovsky and Startovaya. The varieties identified in the
group of mid-ripening plums included Ave, Amitar, Norgen, Garmonia, Renclod Urozhainy,
Sizy Golubok, Skorospelka Novaya and Experimentalor. A weak variation in the chemical
component content was observed in SizyGolubok, Skorospelka Novaya and Nagrada. The
varieties identified in the group of medium-late plums included Kosmos, Luzhskaya Krasnaya,
Korneevskaya 83, Pamyat Khasanova, Renclod Tenkovsky, Kantemirovskaya, Vicana and
Vilnor. The least variation in the chemical component composition was observed in
Azhanskaya from Ogre, Vikana, Kantemirovskaya, Luzhskaya Krasnaya and Renklod
Tenkovsky. The selected late-ripening varieties included Porosl from Ostashkov,
Experimentalstetter and Solotovskaya Pozdnyaya. A weak variation in the chemical
component content was observed in Solotovskaya Pozdnyaya, Tulskaya Chernaya and
Experimentalstetter.
PROCESSING AND STORAGE OF FRUIT AND BERRY CROPS
Abstract
The article presents the results of the study of the biochemical composition of kiwi
fruit growing in conditions of the South of Russia, emphasizing their high nutritional and
biological value, as well as antioxidant properties. Varietal differences have been found in the
content of soluble dry substances, sugars (including glucose, fructose, sucrose), organic acids
(citric, malic), vitamin C, polyphenols, amino acids, and aromatic, pectin and mineral substances. The limits of the accumulation of sugars (6,7…8,0 %), pectin (0,45…0,58 %),
organic acids (1,49…1,73 %), vitamins C (58,1…113,8 mg/100 g) and Ð (12,8…18,5 mg/100 g)
in the fruits of kiwi have been determined. It has been established that for the further use in
the development of canned production may be recommended kiwi varieties Ellison, Monty,
Abbott.
fruit growing in conditions of the South of Russia, emphasizing their high nutritional and
biological value, as well as antioxidant properties. Varietal differences have been found in the
content of soluble dry substances, sugars (including glucose, fructose, sucrose), organic acids
(citric, malic), vitamin C, polyphenols, amino acids, and aromatic, pectin and mineral substances. The limits of the accumulation of sugars (6,7…8,0 %), pectin (0,45…0,58 %),
organic acids (1,49…1,73 %), vitamins C (58,1…113,8 mg/100 g) and Ð (12,8…18,5 mg/100 g)
in the fruits of kiwi have been determined. It has been established that for the further use in
the development of canned production may be recommended kiwi varieties Ellison, Monty,
Abbott.
NURSERY AND AN AGROTECHNICS OF FRUIT CROPS
Abstract
The results of the research of new crowning methods of one-year plum seedlings are
given.
Figures, showing the influence of growth regulator (abrolin), apex topping upon the
amount and length of side branches, height and thickness of trunks, quality features of the
foliage and the root system of seedlings have been obtained.
On the ground of the research results, the most effective one occurred to be a
combined agromethod with the use of growth regulator together with topping of the apical
leaves, which allowed to get good quality branchy one-year plum seedlings with wide angles
of stem divergence, developed root system and productivity of 47.2...55.0 thousand pieces/ha.
given.
Figures, showing the influence of growth regulator (abrolin), apex topping upon the
amount and length of side branches, height and thickness of trunks, quality features of the
foliage and the root system of seedlings have been obtained.
On the ground of the research results, the most effective one occurred to be a
combined agromethod with the use of growth regulator together with topping of the apical
leaves, which allowed to get good quality branchy one-year plum seedlings with wide angles
of stem divergence, developed root system and productivity of 47.2...55.0 thousand pieces/ha.
ORNAMENTAL HORTICULTURE
Abstract
Brief results of selection work with peonies at the Botanical garden of the Ufa Scientific
Center for more than fifty years are given. The main stages of breeding are described. New
varieties of paeonia hybrida hort.. are characterized.
Center for more than fifty years are given. The main stages of breeding are described. New
varieties of paeonia hybrida hort.. are characterized.
Abstract
The article presents the results of a new study of the influence of growth regulator
Biodux on the productivity of some ornamental plants. Perennial shrubs of genus Paeonia - 4
species (P. anomala, P. hybrida, P. tenuifolia, P. lactiflora) and 2 hybrid varieties of peony (Jeanna d’Arc, Mustai Karim); genus Hosta - 5 species (H. lancifolia, H. undulata, H. sieboldiana,
H. fortunei, H. glauca var. aurea); genus Iris - 2 species (I. sibirica, I. carthaliniae) and 9 hybrid
varieties of iris (Arginnis, Beethoven, Victor Hugo, Hector, Delilah, Deputy Namblo, Iris King,
Mystic, Rialgar) in the phase of maturing have been used as subjects of the research. It is
shown that the given preparation in most cases increases the habit of plants and their seed
production. Plants of hosta occurred to be the most responsive to Biodux treatment.
When treating plants with the growth regulator, maximum values of examined
parameters have been obtained in comparison with controls and other crops. Irises occurred
to be the least susceptible cultures.
Biodux on the productivity of some ornamental plants. Perennial shrubs of genus Paeonia - 4
species (P. anomala, P. hybrida, P. tenuifolia, P. lactiflora) and 2 hybrid varieties of peony (Jeanna d’Arc, Mustai Karim); genus Hosta - 5 species (H. lancifolia, H. undulata, H. sieboldiana,
H. fortunei, H. glauca var. aurea); genus Iris - 2 species (I. sibirica, I. carthaliniae) and 9 hybrid
varieties of iris (Arginnis, Beethoven, Victor Hugo, Hector, Delilah, Deputy Namblo, Iris King,
Mystic, Rialgar) in the phase of maturing have been used as subjects of the research. It is
shown that the given preparation in most cases increases the habit of plants and their seed
production. Plants of hosta occurred to be the most responsive to Biodux treatment.
When treating plants with the growth regulator, maximum values of examined
parameters have been obtained in comparison with controls and other crops. Irises occurred
to be the least susceptible cultures.