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William G. McGlynn and Siobhan Reilly

Watermelons were dipped in either 1000 ppm sodium hypochlorite solution or in deionized water, dried, then cut into chunks of ≈83 × 152 × 51 mm. These were sealed into plastic containers and stored at either 2, 4, or 8 °C. Samples were removed after 3, 7, and 10 days for microbial and quality tests. Chlorine dip reduced average aerobic plate counts by ≈3 log cycles and average coliform counts by nearly 2 log cycles. This may have significant implications for food safety and off-flavor development. The difference in microbial counts persisted for ≈7 days. No clear effect from storage temperature was seen. A trend for lower temperatures to preserve red hue was observed in objective color tests. Texture tests revealed a trend for all melons to become firmer during storage. No clear patterns with respect to storage temperature or sanitizing dip were seen.

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Brian A. Kahn and William G. McGlynn

Snap bean (Phaseolus vulgaris L.) cultivars with pods representing a range of greenness were grown in Oklahoma field trials in 2001 and 2004. Objective color evaluations (L* value and hue angle) performed on raw and cooked pod samples from 10 (2001) or 12 (2004) of these cultivars indicated that color testing of raw snap bean pods may not be sufficient to determine the color after cooking. Although L* values may be expected to decrease after cooking, the magnitude of the changes may not be predictable. Changes in hue angle values after cooking appear to be even more variable among cultivars. Therefore, if the color of the cooked beans is expected to be a deciding factor in cultivar selection, we would recommend conducting color tests on cooked bean pods as well as the raw product. Twenty relatively straight, unblemished pods per cultivar were harvested on 20 June 2001 and on 30 June 2004 from plants of ‘Blue Lake 274’, ‘Brio’, ‘Charon’, ‘Jade’, and ‘Seville’. The five most uniform pods per cultivar (all sieve Size 4) were presented as raw samples that same day to an untrained panel consisting of seven males and 18 females (2001) or nine males and 18 females (2004). This was an affective test; panelists were asked to evaluate intensity of color and likeliness to buy using a 5-point semantic differential scale. Correlation coefficients for the two attributes were calculated. Sensory panelists were able to make subjective distinctions among the cultivars based on color. However, these differences did not necessarily correlate with either objective color measures or likelihood of purchase. Snap bean pod color is not an overriding selection criterion, but only one of many criteria considered by consumers.

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Eric T. Stafne, B. Dean McCraw, William G. McGlynn, and R. Keith Striegler

Rootstocks can offer benefits such as pest resistance, tolerance of certain soil characteristics and tolerance of salts and salinity. The objective of this study was to determine if `Cabernet Franc' grafted onto various rootstocks differed in a number of measured yield and quality variables. The plots consisted of Clone 1 `Cabernet Franc' with four different rootstocks: 1103 Paulsen, 140 Ruggeri, 3309 Couderc, and St. George. Rootstock did not have much effect on the yield or quality of fruit produced by `Cabernet Franc'. Although not significantly different, the overall yield of 3309C appears to be lower than the other rootstocks. With further data, it might be possible to identify annual climate patterns that favor one rootstock over another with respect to certain quality attributes. One particular problem with `Cabernet Franc' in Oklahoma is its tendency to overbear, thus resulting in uneven ripening.