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Dominique-André Demers, Martine Dorais, and Athanasios P. Papadopoulos

-polyethylene film, at the Greenhouse and Processing Crops Research Center (Harrow, Ont., Canada; lat., 42º0′N, long., 82º54′W). Tomato plants ( Lycopersicon esculentum Mill.) were grown on rockwool (plugs, cubes, and slabs for seedling, transplant, and cropping

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Leonardo de B. Giordano, Antônio Carlos de Ávila, João Maria Charchar, Leonardo S. Boiteux, and Edinardo Ferraz

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Joyce G. Latimer and Paul A. Thomas

Brushing 2-week-old `Sunny' tomato (Lycopersicon esculentum Mill.) seedlings, grown in a commercial production greenhouse, for a period of 5 weeks reduced transplant growth and improved plant appearance. Brushing reduced stem length 37% and leaf area 31% relative to nontreated control plants. Plants were darker green in color, stockier, easier to handle, and tougher (exhibited less breakage) than nontreated plants.

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Sezgin Uzun

of Lycopersicon esculentum Mill J. Amer. Soc. Hort. Sci. 101 348 360 Bakker, J.C. 1990 Effects of day and night humidity and yield quality of glasshouse eggplant J. Hort. Sci. 65 747 753 Bertin

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David A. Francko, Kenneth G. Wilson, Qingshun Q. Li, and Maria A. Equiza

A novel topical spray was developed to increase resistance to both cold damage and cold mortality in plant foliage, flowers, and fruits. In environmental chamber experiments, application of the spray to monocot and dicot foliage lowered the environmental temperatures associated with the first onset of cold injury and with cold mortality from 2.2 to 9.4 °F, compared with controls sprayed with tap water, over an effective temperature range (depending on species) of ≈0 to 32 °F. The threshold temperature for flower mortality was lowered from 2.2 to 3.2 °F depending on species. Mature fruit suffered significantly less freeze damage when pretreated with the spray formulation. The spray is composed of ingredients that are non-toxic to plants, humans, and other animals. The patent-pending formulation has been commercialized under the trade name FreezePruf.

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Allen V. Barker and Kenneth A. Corey

Inhibitors of ethylene synthesis and action were used to alleviate ammonium toxicity in tomato (Lycopersicon esculentum Mill. `Heinz 1350') grown on ammonium-based nutrient solutions. Aminooxyacetic acid and Ag+ were effective in reducing ammonium toxicity, whereas Co+2 and salicylic acid were not. A hypothesis was developed to integrate ammonium accumulation and ethylene biosynthesis into a mechanism for expression of plant injury from environmental stresses.

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Brian D. McGarvey, Andres A. Reyes, and Mikio Chiba

Residues of the insecticide-nematicide oxamyl in tomatoes (Lycopersicon esculentum Mill.) declined more quickly during storage at 15C in modified atmospheres consisting of 1.5% O2 + 98.5% N2 or 1.5% O2 + 4.0% CO2 + 94.5% N2 than in air. (21.0% O2 + 79.0% N2). Fruit ripened more quickly in air than in either modified atmosphere. Chemical name used: S-methyl N′,N′-dimethyl -N- (methylcarbamoyloxy)-1-thio-oxamimidate (oxamyl).

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D.W.A. Hunt, A. Liptay, and C.F. Drury

Host plant selection by Colorado potato beetle [Leptinotarsa decemlineata (Say)] was examined on tomato [Lycopersicon esculentum Mill.] transplants fertilized with varying N, P, and K concentrations during greenhouse production. In choice tests conducted with beetles in the field and the greenhouse, the insect preference for plants increased with increasing leaf tissue N concentration, but P and K concentrations had no effect. Five-day, seedling acclimatization to outdoor spring temperatures before planting reduced the insect preference for plants.

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Hakim Abdul, Pehu Eija, Voipio Irma, and Khatoon Mohfeza

Ethylene is produced by tomato fruit (Lycopersicon esculentum) at a rate that is dependent on fruit size, maturity stage, and adherence of calyxes. Production rate of ethylene declined with increased maturity stages. Small fruit produced higher ethylene compared to medium or large sizes. Ethylene production is positively correlated with rate of respiration, but not with visible pitting. Fruit stored with calyx produced less ethylene than those that were stored without calyxes.

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Michael A. Schnelle, B. Dean McCraw, and Timothy J. Schmoll

Height control for vegetable transplants has become challenging with the loss of the industry standard growth regulator, daminozide (Alar). One alternative to growth regulators—brushing—was conducted on two cultivars of Lycopersicon esculentum Mill. Five weeks of brushing twice daily resulted in height suppression for both tomato cultivars. Brushing treatments were performed successfully by use of a grower-designed apparatus constructed from readily available materials.