A study is made of the general life history and behaviour of the larvae and adults of Pionea forficalis. Special emphasis is laid on oviposition and on the factors affecting fecundity. Investigations into the nature of diapause in P. forficalis and of the factors concerned with its inception and termination are described. These studies lead to a determination of the relative importance of genetic and environmental factors in the inception of diapause, and into its intensity as illustrated by family emergence distributions. An ecological appraisal of P. forficalis is made using data from the above investigations and from estimates of seasonal abundance based on field sampling. These are related to the characteristics of Brassica crop management to obtain a basis for the determination of the incidence and general abundance of this insect.
| Identifer | oai:union.ndltd.org:bl.uk/oai:ethos.bl.uk:623071 |
| Date | January 1968 |
| Creators | King, Andrew Bryan Stephen |
| Publisher | Imperial College London |
| Source Sets | Ethos UK |
| Detected Language | English |
| Type | Electronic Thesis or Dissertation |
| Source | http://hdl.handle.net/10044/1/15928 |
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