PHENOLOGICAL AND CLIMATIC SIMULATION OF THE LATE FROST DAMAGE IN CHERRY AND SOUR CHERRY IN ROMANIA

Similarly to 2007, 2011 was also critical year for fruit growers in Eastern-Hungary. Serious frost damage was observed at late blooming period (6 May (T=-1.6°C)) in this region, which caused approximately 60-65% of fruit loss. The aim of this study is to investigate the effects of a spring frost event on nutrient uptake and status of the trees of a sour cherry plantation at Újfehértó. The symptoms of frost were observed visually. This visual observation was confirmed by SPAD readings. The frost affected the macroand micronutrient contents of leaves. It was found that the frost affected the nutrient uptake negatively, but the effect of it was not significantly sometimes. It can be stated that the nutrient demand of trees can be supplied only under even worse conditions.

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OVER-WINTER STORAGE OF CONIFEROUS SEEDLINGS AS A MEANS OF PREVENTING LATE FROST DAMAGE

The Forestry Chronicle ◽

10.5558/tfc38192-2 ◽

1962 ◽

Vol 38 (2) ◽

pp. 192-202 ◽

Cited By ~ 1

Author(s):

E. Jorgensen ◽

W. K. L. Stanek

Keyword(s):

White Spruce ◽

Frost Damage ◽

Conclusive Evidence ◽

Northern Ontario ◽

Late Frost ◽

Series Of Experiments ◽

Spring Frosts

In a series of experiments on over-winter storage, seedlings of white spruce and other conifers were placed in normal shipping hales and stored in root cellars without artificial refrigeration. White spruce seedlings were retained in dormant condition for approximately six months without apparent damage to their later performance in plantations. Stored seedlings proved highly resistant to damage from spring frosts and therefore superior to spring-shipped stock from the same nursery beds. Conclusive evidence of the suitability of other conifers for over-winter storage was not obtained. The application of over-winter storage of white spruce seedlings in planting operations in northern Ontario is discussed.

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248 Influence of Early Rowcover Removal and Supported Rowcovers on Yield, Earliness, and Fruit Size of Strawberries Grown under Plasticulture

HortScience ◽

10.21273/hortsci.35.3.433f ◽

2000 ◽

Vol 35 (3) ◽

pp. 433F-434

Author(s):

Peter Nitzsche ◽

Joseph Fiola

Keyword(s):

Fruit Size ◽

Frost Damage ◽

Field Trials ◽

Fruit Production ◽

Fruit Weight ◽

Commercial Production ◽

Marketable Yield ◽

Increased Risk ◽

Late Frost ◽

Early Production

Growers in Northern New Jersey are slowly adopting strawberry plasticulture as an improved production system. One advantage of the system is early fruit production. Early fruit usually brings high prices in the marketplace. With early production, however, there is an increased risk of a late frost damaging flowers and fruit. Removing floating rowcover winter protection earlier than flowering may cause strawberries to bloom later, reducing the risk of frost damage. Supporting the rowcovers above the crop with wire hoops may also provide better winter protection and improve fruit production. In 2 years of field trials, removing floating rowcovers 2 weeks before anticipated bloom reduced early yield and delayed the first harvest by 2 to 3 days. Total marketable yield and average fruit weight were not significantly influenced by early removal. Plants with rowcovers supported with wire hoops did not produce significantly greater total yields or average fruit weights than plants protected by unsupported rowcovers. The wire hoops caused damage to the rowcovers, which may make their use in commercial production impractical.

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Abnormalities of the stigma of sour cherry cultivar

International Journal of Horticultural Science ◽

10.31421/ijhs/14/3/799 ◽

2008 ◽

Vol 14 (3) ◽

Author(s):

H. G. Davarynejad ◽

T. Szabó ◽

Z. Szabó ◽

J. Nyéki ◽

I. J. Holb

Keyword(s):

Environmental Factors ◽

Microscopic Examination ◽

Fruit Set ◽

Outer Part ◽

Sour Cherry ◽

Soil Surface ◽

Frost Damage ◽

Full Bloom ◽

Bottom Part ◽

Black Color

The objective of this study was to evaluate the ratio of blackness of the surface of stigma of sour cherry cultivars. At the full bloom time of sour cherry 100 new opened flowers were marked in the internal (Inside), external (outside), bottom and upper parts of the crown of each cultivars including sour cherry cultivars ‘Érdi bőtermő', `Debreceni bőtermő', `Kántorjánosi', 'R. clone', 'Petri', Pándy', and 'D. clone'. The trees were replicated four times. The numbers of flowers with black stigma were counted and the percentage of dead stigma was calculated. In addition, tissues of black stigmata were investigated for blossom pathogens by microscopy. After flowering time the fruit set of the marked flowers counted and then percentage fruit set was calculated. Numbers of counted flowers were between 300 and 980 depending on the four position of the tree. Black color of stigma could be seen only on three cultivars (`Debreceni bőtermő', Érdi bőtermő' and 'Petri') out of seven assessed cultivars. The highest numbers of black colored stigma were found on cultivar ‘Érdi bőtermő' which ranged between incidences of 12 and 21%. Black stigma was never able to produce a fruit set. Microscopic examination revealed no pathogens associated with black stigma. Different part of the tree resulted different amount of black stigma. Black stigma was the largest on the outer part of the tree on cv. 'Érdi bőtermő' but also bottom part of the tree also produced larger number of black stigma on cvs. `Debreceni bőtermő' and ‘Érdi bőtermő'. Though symptoms were not typical to frost damage, we believe that black stigma is probably due to environmental factors during flowering. This might be associated with late spring cold coming from the soil surface as the bottom and outer part of the tree was more suffered from the disease.

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