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Winter chilling in the southeastern United States and similar climates varies by location as well as from year to year. For successful peach production, cultivars must be chosen to match the chilling regime for a particular location such that

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In areas with cold winters, chilling is more than adequate for normal budbreak and growth of fruit crops, and time of bloom is primarily dependent on onset of warmer temperatures. In the southeastern United States and similar climates, winter

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may injure tropical and subtropical crops such as species of the Cucurbitaceae ( Raison, 1974 ). The damage is often referred to as CI and was reviewed by Lyons (1973) . There have been several reports on chilling tolerance in cucumber seedlings

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Abstract

Chilling sensitivity of ‘Fuerte’ and ‘Hass’ avocados (Persea americana Mill.) is a function of the stage of the climacteric. The least sensitive stage is postclimacteric where fruit can be kept at 2°C for 6 to 7 weeks. ‘Hass’ avocados on the climacteric rise and at the climacteric peak were most sensitive to chilling and showed injury after 19 days of treatment at 2°. Postclimacteric fruit could be transferred to 2° at 36 to 48 hours after the climacteric peak. The time preclimacteric fruit could be held at 2° varied during the picking season but could be as long as 30 days.

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A study evaluating the effects of varying levels of chilling on foliar budbreak of linden (Tilia spp.) culivars was initiated in 1999 in Auburn, Ala. [lat. 32°36'N, long. 85°29'W, elevation 709 ft (216m), USDA Hardiness Zone 8a]. Littleleaf linden (T. cordata) `Greenspire' and `Fairview' required the most chilling to produce measurable budbreak and exhibited the lowest budbreak percentages. Silver linden (T. tomentosa) `Sterling' and american linden (T. americana) `Redmond' needed the fewest hours of chilling to produce budbreak and exhibited the highest budbreak percentages. `Sterling' was the top performer in foliar budbreak percentage and in subsequent growth. Although `Redmond' attained high budbreak numbers, its overall growth during the following growing season was inferior to that of `Sterling', `Greenspire' and `Fairview'. This information can contribute to the development of regional planting recommendations, which can aid in the selection of lindens suitable for the area in which they will be grown. Calculated r2 values indicated the models used provided a good fit to the data for all cultivars.

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We thank R.W. Robinson (New York State Experimental Station, Geneva) for the chilling-tolerant lines. Use of trade names does not imply endorsement of the products named nor criticism of similar products not mentioned. Vegetable Crops Dept

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to three factors that must be considered to adequately estimate freeze risk: 1) the accumulation of winter chill units (CU); 2) the accumulation of growth units following the satisfaction of the winter chilling requirement; and 3) the probability of

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Abbreviations: BB, percent terminal budbreak; BDS, bud development stage; CR, chilling requirement; CU, chill unit; D50, number of days for 50% terminal budbreak; GDH, growing degree hours. 1 Present address: IAPAR-Instituto Agronômico do Paraná

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207 ORAL SESSION 54 (Abstr. 478–482) Cross-commodity: Chilling Stress

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