Showing papers by "Raphael A. Stern published in 2010"
27 Jul 2010
56 citations
TL;DR: Molecular S -genotyping revealed that ‘Spadona’ is semi-compatible with its three pollinators, which explains, at least in part, the relatively low pear yield in Israel.
10 citations
TL;DR: 2,4-DP sprays represent an effective treatment to improve the colour of ‘Cripp’s Pink’ apple at commercial harvest, without adversely affecting other fruit quality attributes.
Abstract: Summary‘Cripp’s Pink’ apple often develops a poor colour at commercial harvest,resulting in economic loss. To determine if fruit colour could be improved without advancing ripening, ‘Cripp’s Pink’ apple trees were sprayed with various synthetic auxins at different phenologic stages, from 30 d after bloom (30 DAB) until 150 DAB.The experiments were conducted in the North of Israel, from 2006 to 2008. Application of 50 mg l–1 of the synthetic auxin 2,4-dichlorophenoxypropionic acid (2,4-DP), as its butoxyethyl ester (PowerTM), or as its potassium salt 2,4-DP-P(PriganTM),at approx. 60 DAB, increased the rate of endogenous ethylene production by the fruit. This was accompanied by an increased concentration of anthocyanins in the fruit skin, and a higher percentage of red blush, without causingthe fruit drop that is usually associated with increased levels of ethylene. Although both auxins accelerated fruit maturation, neither had any negative effects on fruit quality at harvest, or after 6 months of storage a...
5 citations
TL;DR: The objective was to find ways to control the psylla population through rational use of cultural control methods: manipulating the levels of nitrogen fertilization, and using growth regulators.
Abstract: The pear psylla, Cacopsylla bidens (Sulc), is one of the most damaging pests of commercial pear orchards in Israel. However, growers today have only two pesticides left to control the pear psylla, therefore alternative control methods are needed. Our goal was to find ways to control the psylla population through rational use of cultural control methods: manipulating the levels of nitrogen fertilization, and using growth regulators. Our objectives were to determine the impact of nitrogen fertilization level on pear psylla populations, the impact of application of plant growth regulators (clormequat chloride and prohexadion-calcium) on psylla populations, and whether there is an interaction between the two factors in a semi-field-scale and in field-scale experiments. Higher oviposition and nymph development rates were found in trees that had higher leaf-nitrogen contents. Lower oviposition, nymph survival, and nymph development rates were found in trees that were treated with growth regulators. The suppress...
3 citations