Host-Plant Relations of the Hall Scale (Homoptera: Diaspididae) on Peaches and Nectarines in Israel
Authors: BERLINGER, M. J.; FALLEK, CH.; DAHAN, R.; FRIEDLENDER, M.
Source: Journal of Economic Entomology, Volume 89, Number 6, December 1996 , pp. 1453-1459(7)
Publisher: Entomological Society of America
Abstract:The population density of the Hall scale, Nilotaspis hall (Green), on peaches and nectarines in Israel showed 3 peaks during the year. Male nymphs were rare and present only in summer. Winged adult males were not present. Population density was significantly higher under buds closely attached (adpressed) to twigs compared with those that were more protruding. Cultivars with a higher proportion of adpressed buds had greater densities of scales than those with predominantly protruding buds. A good correlation between the number of scales in twig band traps and densities on buds suggests that the traps may be useful for monitoring. Winter buds infested by high densities of scales failed to sprout by spring. Scale feeding on nectarines causes red spots that become gradually darker over time; damage to peaches appears later, closer to picking time. The delayed appearance of discoloration in peaches suggests that late or light scale infestations may not result in economic damage. Egg development was suspended over winter, but resumed simultaneously on different early- and late-ripening varieties. The resumption of reproduction occurred at threshold temperatures that varied with the duration of exposure to low temperatures.
Document Type: Research Article
Publication date: December 1996
- Journal of Economic Entomology is published bimonthly in February, April, June, August, October, and December. The journal publishes articles on the economic significance of insects and is divided into the following sections: apiculture & social insects; arthropods in relation to plant disease; forum; insecticide resistance and resistance management; ecotoxicology; biological and microbial control; ecology and behavior; sampling and biostatistics; household and structural insects; medical entomology; molecular entomology; veterinary entomology; forest entomology; horticultural entomology; field and forage crops, and small grains; stored-product; commodity treatment and quarantine entomology; and plant resistance. In addition to research papers, Journal of Economic Entomology publishes Letters to the Editor, interpretive articles in a Forum section, Short Communications, Rapid Communications, and Book Reviews.
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