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Gregory J. McKee, Frank G. Zalom, and Rachael E. Goodhue

The greenhouse whitefly, Trialeurodes vaporariorum (Westwood), is a cosmopolitan pest of greenhouse crops and ornamentals. It damages plants by feeding on nutrients in a plant's phloem, which may result in yield loss ( Byrne et al., 1990 ), and

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Robert C. Hansen, Kenneth D. Cochran, Harold M. Keener, and Edward M. Croom Jr.

A natural product known as taxol has been approved by the FDA for treatment of ovarian and breast cancers. In addition, preliminary clinical studies have shown encouraging results when using taxol to treat melanomas, lung, head, and neck cancers. Ornamental yews have been identified as a potential renewable source of taxol and related taxanes. Commercial nurseries were surveyed during Summer and Fall 1991 as a basis for estimating populations of Taxus cultivars currently growing in the United States. Clippings of selected cultivars were sampled from nursery fields in Ohio and Michigan to estimate expected clippings yields as a function of cultivar and cultivar age. More than 30 million Taxus plants were reported to be grown by the 19 major nurseries that responded to the survey. About 88% of all Taxus plants reported in the survey were grown in the three-state area of Ohio, Michigan, and Pennsylvania. Taxus × media `Densiformis', `Hicksii', and `Brownii' were found to be grown by nearly all nurseries in the survey; more than half grew T. × media `Wardii' and T. cuspidata `Capitata', while other well-known cultivars seem to have been specialties of one or two nurseries. Annual clippings yields on a dry-weight basis (db) ranged from ≈20 g/plant to 140 g/plant. Expected yields were found to be very dependent upon plant age and cultivar. Taxus × media `Hicksii' appeared to be the most ideal ornamental yew that could provide a renewable source of taxol because of immediate availability and potential for mechanical harvesting of upright clippings. An estimated 3000 to 4000 ovarian cancer patients could be treated annually with the taxol currently available for extraction from T. × media `Hicksii' clippings.

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Rebecca G. Sideman

described in the peer-reviewed literature. Hochmuth and Howell (1983) demonstrated yields of up to 18.6 Mg·ha −1 (332 50-lb bushels/acre) using the cultivar Jewel on raised beds with black plastic mulch in Massachusetts. This study was conducted before

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Roxana Myers, Andrea Kawabata, Alyssa Cho, and Stuart T. Nakamoto

Root-knot nematodes ( Meloidogyne sp.) adversely affect yields of arabica coffee ( Coffea arabica ) in many coffee-growing regions. In Kona, HI, kona coffee root-knot nematodes [ Meloidogyne konaensis ( Eisenback et al., 1994 )] are extremely

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M. Leonard Wells and Bruce W. Wood

. The relationship between leaf mineral nutrient concentrations is well understood for the lower critical level regarding manifestation of visual symptoms pertaining to deficiency of essential mineral nutrients, although this relationship to yield is not

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Harbans L. Bhardwaj and Anwar A. Hamama

helping to increase the availability of this crop as an oilseed. The objectives of these studies were to determine fresh yield and nutritional quality traits of canola sprouts and to assess the potential of canola sprouts by comparing their composition

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Derek W. Barchenger, Khin Thandar, Thain Gi Myint, Tran Ngoc Hung, Nguyen Quoc Hung, Shih-wen Lin, Yen-wei Wang, and Tsung-han Lin

-specific preferences for chile pepper fruit shape, size, color, and capsaicinoid content, as well as yield, are major driving forces for farmer cultivar selection ( Barchenger et al., 2018 ). Adaptation to warm, humid climates; high yield potential; yield stability

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Paul E. Blom and Julie M. Tarara

Given the finite resources of juice processors and wineries, and the perishable nature of the crop, accurate estimation of yield in grapes is crucial for optimal scheduling and processing of the harvest. Difficulties associated with yield estimation

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Jeanine M. Davis

The objective of 2 years of field studies was to begin development of a luffa sponge gourd (Luffa aegyptiaca Mill.) production system for a cool, temperate climate by studying the effects of planting date, planting method, in-row spacing (30.5, 61, and 91 cm), and pruning techniques on yield and quality of luffa sponge gourds. High yields of mature gourds were obtained when transplants were field-set as soon as the danger of frost had past. Highest marketable yields were obtained when plants were spaced 30.5 cm apart in the row and the first four lateral shoots were removed. Plants spaced 91 cm apart produced gourds with the largest diameter, whereas plants with 30.5-cm in-row spacing produced the highest yields of gourds with bath sponge diameters (5.1-7.6 cm). Plants spaced 91 cm apart and topped at node six obtained high fiber density, strong fibers, and excellent visual appeal, but low yields. Yields were competitive with yields obtained in warmer climates.

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Job Teixeira de Oliveira, Rubens Alves de Oliveira, Fernando França da Cunha, Isabela da Silva Ribeiro, Lucas Allan Almeida Oliveira, and Paulo Eduardo Teodoro

, 2018 ). Water is the factor that most often affects the development, yield, and quality of garlic. Soil water deficiency mainly compromises plant development and bulb yield, whereas excess impairs quality and conservation ( Costa et al., 1993 ). Because