Late frost damage to olive trees

Frost damage was evaluated in 1-year-old olive trees in the cultivars ‘Arbequina’, ‘Cornicabra’, ‘Empeltre’, ‘Frantoio’, ‘Hojiblanca’, ‘Manzanilla Cacereña’, ‘Nevadillo de Jaén’, ‘Picual’, ‘Picudo’ and ‘Verdial de Badajoz’ in Madrid, Spain. Temperatures fell to −6.5 and −10.5°C on 11 November and 16 December 2001, respectively. In May frost damage was visually assessed. The olive trees were pruned to the ground and dry matter was quantified in shoots and leaves with and without signs of frost damage. In August resprouting was visually evaluated. Visual assessment overestimated frost damage compared to the quantitative evaluation. Leaves had a lower resistance to frost than shoots. Shoot frost resistance was linearly correlated to the cultivar's resprouting capacity. Significant differences in frost resistance were found between cultivars. ‘Cornicabra’ and ‘Arbequina’ had a low percentage of frost-damaged shoots and a high resprouting capacity after frost. The cultivars which were the least resistant to frost were ‘Empeltre’, ‘Frantoio’ and ‘Hojiblanca’. These cultivars had a high percentage of frost-damaged shoots and almost no resprouting capacity. ‘Picual’, ‘Picudo’, ‘Verdial de Badajoz’, ‘Manzanilla Cacereña’ and ‘Nevadillo de Jaén’ had an intermediate frost resistance.

Download Full-text

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.

Download Full-text

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.

Download Full-text