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The green peach aphid (GPA) is a serious pest of peach tree in many areas of the world. To date, only one GPA resistance gene has been assigned in peach. This study was initiated to determine the inheritance of GPA resistance in the red leaf peach rootstock cultivar ‘Rubira’. Crosses were made between ‘Rubira’ and the susceptible green leaf peach rootstock cultivar ‘Pamirskij 5′. Genetic analysis was performed on the parents, F1 and F2 progenies. Analyses of segregation patterns of plants in F1 (1:0) and F2 (3:1) indicated single dominant gene control of GPA resistance in ‘Rubira’. Reddish spots, probably due to aphid feeding punctures, are associated with, but not themselves responsible for, the GPA resistance in ‘Rubira’. No relationship was found between GPA resistance and the red leaf character of ‘Rubira’.

The Optical Fibre Diameter Analyser (OFDA) instrument is based on automatic image analysis technology and was recently introduced to provide a rapid, accurate measurement of average fiber diameter (AFD) and diameter distribution (SD) of textile fibers. Experiments were conducted with wool and mohair in various physical forms (top, core, and staple) to compare results produced by the OFDA with two other methods of determining fiber diameter parameters: the standard projection microscope (PM) method as described by the American Society for Testing and Materials (ASTM) and the Peyer Texlab FDA 200 System (FDA200). The results show that the OFDA fiber diameter measurements were very closely related to PM measurements, and the OFDA partially overcame one shortcoming of the FDA200, overestimation of SD. The results suggest that the OFDA is a promising system for rapid and accurate evaluation of fiber diameter and its distribution.

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