Graduate Thesis Or Dissertation
 

Population development of Scutigerella immaculata (Newport), in laboratory and greenhouse cultures

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  • Population development of the symphylan, Scutigerella immaculata (Newport), was studied in laboratory cultures. Also symphylan injury to greenhouse plants was investigated. Plastic polyethylene containers partly filled with damp ground hemlock bark were used to culture symphylan in the laboratory. Fresh lettuce food was supplied to the cultures weekly. Factors which appreciably affected symphylan population development included: moisture content of the bark medium, culture temperature, kind of food supplied and population density. Results indicated that the optimum conditions for symphylan culture population development were: moisture--30%, temperature--24°C, fresh lettuce for food and adequate space in the culture container. Greenhouse experiments included the demonstration of plant injury by symphylans and the population levels involved. Plant injury was determined by the dry weight of the above ground portion of the bean or corn plant. Planting delays of one to two weeks after symphylan infestation did not seem to influence the degree of injury. When bean or corn plants were given a good start before symphylan introduction little or no injury resulted. Conditions for the development of symphylan cultures for use in laboratory and greenhouse experiments were defined by the conclusions of this study.
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