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Harsimran K. Gill, Robert McSorley, and Danielle D. Treadwell

Soil solarization, also referred to as solar heating or solar pasteurization, is accomplished by passive heating of moist soil covered with transparent plastic film for more than 6 weeks ( McGovern and McSorley, 1997 ). Solarization is a useful

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Lixiang Miao, Yuchao Zhang, Xiaofang Yang, Jinping Xiao, Huiqin Zhang, Ming Jiang, Zuofa Zhang, Yuezhi Wang, and Guihua Jiang

physiology. Photoselective plastic films, bagging, mulch, coating, or netting can be used to alter light. Far red (FR) and red lights (R), and the ratio of FR/R photon can be significantly affected by these applications, which might act through the natural

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Juan C. Díaz-Pérez, K. Dean Batal, Darbie Granberry, Denne Bertrand, David Giddings, and Hanu Pappu

; and Green-Tek and Sonoco for plastic film mulches. Mention of trade names in this publication does not imply endorsement by the Univ. of Georgia of products named, nor criticism of similar ones not mentioned.

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Juan C. Díaz-Pérez and K. Dean Batal

tomato seeds; United Irrigation and Roberts Irrigation Products Inc., for drip tape; Hydro Agri North America, Inc., for calcium nitrate liquid fertilizer; and Green-Tek and Sonoco for plastic film mulches. Mention of trade names in this publication does

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Juan C. Díaz-Pérez, Sharad C. Phatak, David Giddings, Denne Bertrand, and Harry A. Mills

calcium nitrate liquid fertilizer; and Green-Tek and Sonoco for plastic film mulches. Mention of trade names in this publication does not imply endorsement by the University of Georgia of products named, nor criticism of similar ones not mentioned.

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Juan Carlos Díaz-Pérez

years, vegetable production has shown significant yield increases [ Krug, 1999 ; U.S. Department of Agriculture (USDA), 2007 ]. Plasticulture techniques such as plastic film mulch and drip irrigation have undoubtedly contributed considerably to these

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Sandra B. Wilson and Nihal C. Rajapakse

Plant response to photoselective plastic films with varying spectral transmission properties was tested using lisianthus (Eustoma grandiflorum) `Florida Pink', `Florida Blue', and `Florida Sky Blue'. Films were designated YXE-10 (far-red light-absorbing film) and SXE-4 (red light absorbing film). Light transmitted through YXE-10 films reduced plant height compared to control plants by 10% (`Florida Blue'), and stem dry weight by 19% to 40%, but the response varied by cultivar. Internode length was reduced by 10% to 19% when `Florida Pink' and `Florida Sky Blue' plants were grown under YXE-10 films. Leaf and root dry weights were not affected by YXE-10 films, with the exception that `Florida Sky Blue' plants had a lower leaf dry weight than the control plants. Light transmitted through SXE-4 films increased plant height of `Florida Pink' plants by 15% but not of `Florida Blue' or `Florida Sky Blue.' Regardless of cultivar, dry weight of leaf, stem and root tissue was not affected by SXE-4 films as compared to control films. The average number of days to flower and bud number were not affected by YXE-10 or SXE-4 films, regardless of cultivar. The results suggest that selective reduction of far-red wavelengths from sunlight may be an alternative technique for greenhouse production of compact plants, but the magnitude of the response is cultivar specific.

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D. Michael Glenn and G.J. Puterka

study was to examine the effect of an aluminized plastic film (APF) and a particle-based reflective film applied to the tree (PFT and PFW) and the grass (RPF) between tree rows, each with different R/FR reflection characteristics, on apple color and

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Beatriz M. Díaz, Ricardo Biurrún, Aránzazu Moreno, Miguel Nebreda, and Alberto Fereres

Ultraviolet (UV)-absorbing plastic films are being used as a photoselective barrier to control insect vectors and associated virus diseases in different horticultural crops. A 2-year experiment was carried out in northeastern Spain (Navarra) to evaluate the impact of a UV-blocking film (AD-IR AV) on the population density of insect pests and the spread of insect-transmitted virus diseases associated with head lettuce [Lactuca sativa (L.)]. Results showed that the UV-absorbing plastic film did not loose its ability to filter UV radiation after three lettuce crop cycles (14 months). The UV-absorbing plastic film was effective in reducing the abundance and in delaying the colonization of lettuce by aphids [Macrosiphum euphorbiae (Thomas) and Acyrthosiphum lactucae (Passerini)]. A significant increase in the percentage of marketable plants was achieved under UV-absorbing films due to a reduction in the number of plants infested by aphids and by insect-transmitted virus diseases (mainly potyviruses). Also the UV-absorbing plastic films were effective in reducing the population density of Frankliniella occidentalis (Pergande) and the spread of tomato spotted wilt virus (TSWV) as well as the population density of the lepidopteran pest, Autographa gamma (L.), a common pest of lettuce in Spain. However, no effective control of the greenhouse whitefly Trialeurodes vaporariorum (Westwood) was achieved. The results showed that UV-absorbing plastic films are a very promising tool to protect greenhouse lettuce from the main pests and insect-transmitted virus diseases occurring in northeastern Spain.

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Kent D. Kobayashi*

Controlling plant height is an important practice in the ornamental plant industry. With high cost of growth regulators and concern about their environmental aspects and health of workers, alternative ways of controlling growth may be advantageous. Objective was to determine effect of photoselective shadecloth and plastic film on growth of `Barbara', `Shasta', and `Chesapeake' mums under supplemental lighting. In experiment 1, `Barbara' plants (two and four weeks old) were placed under either wide spectrum fluorescent lamps and incandescent light bulbs (control) or lights covered with photoselective shadecloth. In experiment 2, 3-week-old `Shasta' and `Chesapeake' plants were placed under lights or lights covered with photoselective plastic film. Effect of shadecloth differed with age of `Barbara' plants. For 1-month-old plants placed under lights, stem diameter, stem dry weight, and root dry weight were reduced under shadecloth compared to control. No differences were observed for plant height, pot height, leaf number, leaf area/plant, and leaf dry weight. For 2-week-old plants, leaf number, leaf area/plant, leaf dry weight, and stem dry weight were less under shadecloth than control. No effects on plant height, pot height, stem diameter, and root dry weight were observed. Plastic film reduced plant height and pot height for `Shasta' and `Chesapeake' plants and reduced stem dry weight and total plant dry weight for `Shasta'. No differences were seen for other growth measurements. This study indicated photoselective shadecloth did not control height of `Barbara' and its effect on growth was influenced by plant age. Photoselective plastic film controlled height of `Shasta' and `Chesapeake' and offers an alternative method for growth control of mum plants.