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Title: Biocontrol of glasshouse scale insects using the coccinellid predator 'Chilocorus nigritus'
Author: Ponsonby, David John
ISNI:       0000 0004 2737 319X
Awarding Body: Imperial College London
Current Institution: Imperial College London
Date of Award: 1995
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The effects of environmental factors on development, immature mortality and size in the diaspid Abgrallaspis cyanophylli (Signoret) were studied and a method of mass rearing on Solanum tuberosum L. tubers is described. Equations for the prediction of developmental periods at varying temperatures are given using thermal summation and polynomial regression methods. A method for predicting the weight of settled stages of A. cyanophylli by measuring the length of the body is described. A method for rearing the coccinellid predator Chilocorus nigritus (F.) using A. cyanophylli as a host is described and its thermal requirments were determined using constant and cycling temperatures in the range of 20 to 30°C. Methods of predicting developmental periods are presented using the accumulated heat method and polynomial regression. The effects of temperature and humidity on immature mortality, adult longevity, fecundity, egg viability and voracity were examined. It was found that C. nigritus has thermal and humidity requirements which make it ideally suited to a range of glasshouse conditions.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available