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Darren J. Hayes and Bryan J. Peterson

that were treated with solutions varying in concentration of K-IBA and inserted into propagation media varying in their proportions of coarse perlite and milled peatmoss. The effects of these treatments were evaluated in both overhead mist and

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Olivia Sanchez, Stephanie E. Burnett, and Bryan J. Peterson

humidity and poor air circulation in enclosed cases often resulted in cutting decay and disease symptoms, likely caused by gray mold [ Botrytis cinerea ( Preece, 2003 )]. The first published research using overhead mist systems for propagation dates back

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Y. Zhang, J.L. Shipp, and T.J. Jewett

Overhead fogging or misting is an essential technique applied in modern greenhouses for cooling and humidifying. This technique can be used to promote yield and quality of greenhouse crops either by providing favorable environment for the plant growth or by increasing the efficiency of greenhouse pest and disease control. In this study, the effect of high-pressure overhead misting on greenhouse climate and leaf surface microclimate conditions for cucumber crops in a glass greenhouse was investigated. It was found that the temperature of the greenhouse air was lowered by 5-6 °C and relative humidity was increased by 20% to 30% during misting. The temperature of sunlit leaves was slightly reduced in the morning (2-3 °C), and leaf wetness duration was significantly extended by misting. Leaf wetness duration under misting was predominately influenced by light intensity at the leaf level and was modelled as a function of misting period and average radiation intensity. Results of this study can be used to improve the predictions of pest and disease breakout and the efficiency of their control measures. The empirical model developed in this study can be integrated with leaf surface microclimate models to correctly predict surface moisture conditions and evaporative cooling from water films at the leaf surface.

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Bryan J. Peterson, Stephanie E. Burnett, and Olivia Sanchez

Overhead mist revolutionized the propagation industry by providing a reliable means to manage transpirational water loss by leafy stem cuttings. This system slows transpiration of cuttings primarily by decreasing leaf temperatures through

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Stephanie E. Burnett, Bryan J. Peterson, and Marjorie Peronto

Stem cuttings are traditionally propagated using overhead mist systems. Recent work has explored the use of a different approach: submist propagation ( Peterson et al., 2018a , 2018b ; Sanchez et al., 2020 ). Submist propagation systems apply

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Lucas McCartney and Mark Lefsrud

temperatures, water sprayed on fruit from water sprinkler systems results in an ice layer that encases the surface of the fruit and protects it from freezing damage ( Issa, 2012 ). Overhead sprinkler irrigation, sometimes called simple overhead irrigation, is

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Bryan J. Peterson, Olivia Sanchez, Stephanie E. Burnett, and Darren J. Hayes

Overhead mist revolutionized the propagation industry by providing reliable means to manage transpirational water losses by leafy stem cuttings. This system slows transpiration of cuttings primarily by decreasing leaf temperatures through

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Robert H. Stamps, Seenivasan Natarajan, Lawrence R. Parsons, and Jianjun Chen

-based cold protection systems at these locations ( Fig. 1 ) used mist and fog emitters rather than conventional overhead irrigation systems. Water application rates for cold protection based on shadehouse areas and volumes ranged from 6,919 to 160,810 L·ha −1

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Roberto G. Lopez and Erik S. Runkle

hr . Overhead mist containing reverse-osmosis water supplemented with water-soluble fertilizer was provided as necessary and delivered the following (mg·L −1 ): 50 N–8 P–42 K–22 Ca, 1.0 Fe and Cu, 0.5 Mn and Zn, 0.3 B, and 0.1 Mo (MSU Special

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R. Thomas Fernandez and James A. Flore

Fruit of sweet cherry (Prunus avium L.) crack during or after rain due, in part, to absorption of water through the fruit surface driven by the water potential gradient. In 1972, J. Vittrup-Christensen suggested that overhead misting of calcium salts during precipitation may be an effective way to prevent cherry cracking by reducing the water potential gradient. We tested this hypothesis by designing a computer-controlled irrigation system to intermittently spray a 10% CaCl2 solution on trees during rain events. Spray emitters were placed in the middle and at the top of the canopy. The program turned the system on for 90 s at each 0.3 mm of rain and monitored daily rainfall and accumulated mist times. Two `Emperor Francis' and two `Ulster' were treated with equal number of controls. Intact and cracked cherries were counted on four branches per tree at three times when cherries were susceptible to cracking. Overall, cracking was reduced from 33% to 11% by the CaCl2 spray at the end of the experiment. Treated `Ulster' had 9% cracked fruit, while control had 43% cracked fruit. Differences for `Emperor Francis' were not significant. Phytotoxicity was estimated at about 15 % of leaf area. This system will be reevaluated in 1995 with the added objective of quantifying and reducing phytotoxicity.