Effects of Evaporative Cooling during Dormancy on ‘Redhaven’ Peach Wood and Fruit Bud Hardiness1

Spring overtree misting using greenhouse mist nozzles was tested for effects on bloom delay, incidence of disease, European red mite populations, fruit size, maturity, fruit russeting and tree survival of ‘Golden Delicious’ apple (Malus domestica Borkh.) on Mailing 9 rootstock. Bloom delay of 9 and 8 days was observed in misted trees in 1975 and 1976, respectively, Apple scab was controlled with standard fungicide spray programs, but fireblight was severe in 1975 on misted trees. European red mite (Panonychus ulmi Koch.) egg hatch was delayed on misted trees but post treatment populations were not affected. Phytotoxicity occurred on calyx and foliar tissue in misted trees in 1975. Fruit set and yield were reduced in misted trees in both years. Fruit size in misted treatments in 1975 was reduced through late July, but was comparable at harvest. In 1976, misted fruit size was reduced. Fruit color, soluble solids and firmness tests indicated maturity was delayed by mist. Fruit russeting in spring misted treatments was reduced. Substantial tree losses occurred in misted treatments in 1975.

mentioning

confidence: 99%

Overtree Misting for Bloom Delay in ‘Golden Delicious’ Apple1

Stang

Ferree

Hall

et al. 1978

“…But there was a delay of only 4 to 6 days as calculated from periodic soluble solid measurements during harvest. Bauer et al (5) found no reduction in fruit solids for peaches, but delaying apple bloom (3) reduced soluble solids and consequently maturity by at least 7 days. Therefore, our study indicates a delay in soluble solids in bloom-delayed hedgerow 'Bartlett' and 'Bose' pears comparable to that found for apples (3).…”

Section: Resultsmentioning

confidence: 99%

“…Alfaro et al (3) reported that sprinkling cherry and apple buds delayed bloom 2 weeks and harvest maturity 1 week for both species, but they observed no differences in fruit size or color. Bauer et al (5) observed that bloom delay o f 'Redhaven' peaches did not change sugar or protein levels of the fruit, but reduced yields. Our objectives were to evaluate bloom delay on harvest maturity and quality of 'Bartlett' and 'Bose' pears.…”

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confidence: 99%

The Effects of Evaporative Cooling for Bloom Delay on ‘Bartlett’ and ‘Bosc’ Pear Fruit Maturity and Quality1

Collins

Lombard

Wolfe

1978

Mature orchard misting and sprinkling and young hedgerow misting for bloom delay of pear (Pyrus communis L.) reduced fruit sizes of ‘Bartlett’ 6% and of ‘Bosc’ 12%. Harvest maturity, indicated by fruit pressure testing, was delayed 0 to 6 days for ‘Bartlett’ and 2 to 7 days for ‘Bosc’. The effect of bloom delay on fruit size and maturity was greater on ‘Bosc’ than ‘Bartlett’. Bloom delay had a greater effect on fruit sizing at harvest (3.5 days for every 6 days of bloom delay) than on harvest maturity (1 day for every 6 days delay). Soluble solids, not affected in pears from the mature plots, were slightly lower in the misted hedgerow. Titratable acids were not influenced by bloom delay.

“…Methods for delaying the bloom of peach for frost protec tion have received considerable attention in recent years. The most promising technique appears to be evaporative cooling of the flower buds developed in Utah.2 It has been used with suc cess in dry climates, but has led to serious side effects in more humid areas with heavy soils (1,13). Recently, it has been re ported that the peach seedling rootstock Siberian C causes de lay of bloom in the scion cultivar for up to 6 days (14).…”

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confidence: 99%

Influence of Siberian C Rootstock on Peach Bloom Delay, Water Potential, and Pollen Meiosis1

Young

Houser

1980

A four-year-old planting of peach (Prunus persica (L.) Batsch cvs. Cresthaven and Harken on Halford, Lovell, and Siberian C rootstocks was monitored for date of completion of chilling requirement and date of bloom, and change in xylem water potential with bloom. Siberian C rootstock delayed the completion of chilling requirement by 2 days and time of bloom by 4 days in both cultivars. Xylem water potential of fruiting shoots decreased to a minimum just after the swollen bud stage then increased sharply until petal fall. The change in water potential and all 5 bloom stages were delayed by Siberian C but not by Halford or Lovell seedling rootstocks.