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• W3150489281 abstract "There are good reasons for encouraging research on the biological control of vectors. However, the beginning of the Preface of this book states that 'in the 1950s DDT reduced tropical diseases to a minimum', that they returned because vector insects developed resistance to 'most chemical insecticides' and that the high doses of chemicals now necessary are 'dangerous for man'. These sweeping statements are reminiscent of tabloid journalism and it is surprising to find them in a WHOsponsored book. The front cover carries only the main title Biological Control of Vectors, which might suggest that the book will give instruction on how to control vectors with biological agents, l-lowever, as indicated by the subtitle, the book is mainly about how to collect and identify parasites of vector species in order to start research on their possible use for biological control. Most attention is given to fungi and protozoa, and keys and 90 good photomicrographs are presented to help to identify them by the appearance of the parasitized insect as well as the detailed morphology of the parasite. These aids would be useful for training but I suspect that reliable identifications in these difficult groups would also require help from an expert and/or consultation of more specialist literature. Most attention is naturally given to mosquito larvae, but the vectors or intermediate hosts of the six tropical diseases chosen by WHO/TDR (blackflies, tsetse, triotamines, Biomphalaria snails, etc.) are not forgotten. Fish, the bacterium Bacillus thuringiensis israelensis and the predatory mosquito Toxorhynchites are virtually the only biological agents currently used operationally against vectors. There are some interesting details in the book about how to rear and distribute Gambusia fish and about their behaviour. However, there are only three pages devoted to the bacterial agents and nothing at all about Toxorhynchites. Ideally, biological control needs only one introduction to set up a self-sustaining population of the control agent but, apart from introductions across geographical or ecological barriers, a proposal to aim for this ideal invites the retort 'If your biological agent is so good why isn't it controlling the pest already?' Enhancement of natural population densities implies the ability to mass-rear economically, which, especially in the cases of the fungi and protozoa with copepods as intermediate hosts, can barely be envisaged. We are left with the idea that the combined effect of existing natural enemies must be an important factor in ensuring that vector problems are no worse than they already are. This is one factor that should be taken into account when assessing the environmental impact of proposed environmental changes, eg. an extension of the use of synthetic or bacterial pesticides. A proper checking-out of these possibilities will need far more field workers able to collect and identify natural enemies, and this book can help in their training." @default.
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• W3150489281 date "2003-01-01" @default.
• W3150489281 modified "2023-09-26" @default.
• W3150489281 title "Biological Control of Vectors: Manual for Collecting,, Field Determination and Handling of Biofactors for Control of Vectors" @default.
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