ISSN:
1573-8248
Source:
Springer Online Journal Archives 1860-2000
Topics:
Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
Notes:
Summary Ecological studies onQuadraspidiotus perniciosus Comst. (Homoptera-Diaspidinae) have been realized in the mediterranean zone of France. New investigations concern: - life cycle of San José Scale. There are three generations per year, the scale hibernates as a diapausing first instar larva; - natural mortality: climatic factors have prevailing importance on the growth of populations, during the spring by their action on young larval instars; - natural enemies; Predators:Cybocephalus sp.,Chilocorus bipustulatus l. have no economic interest; Collected parasites are:Aphytis proclia wlk.,Aspidiotiphagus citrinus craw.,Prospaltella aurantii how. Their numerical importance varies during the year. But their life cycle is determined by two factors: climate and host, the second depending also of the first.Aphytis proclia has three generations and a possible partial fourth. Its cycle is only conditioned by seasonal factors. Both endophagous parasites have a life cycle with three generations and a possible partial fourth. In winter diapause of host induces dormancy of the parasite. But during spring summer and autumn, climatic factors alone regulate the evolution of Hymenopterous parasites.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF02372256
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