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Books > Science & Mathematics > Biology, life sciences > Zoology & animal sciences > Invertebrates > Insects (entomology)
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An Atlas of Insect Diseases (Paperback, Softcover reprint of the original 1st ed. 1977)
Loot Price: R1,606
Discovery Miles 16 060
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An Atlas of Insect Diseases (Paperback, Softcover reprint of the original 1st ed. 1977)
Expected to ship within 10 - 15 working days
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Diseases of insects are important factors reducing the number of
insects in natural populations. They are density dependent and they
act especially under conditions of outbreaks and close contact of
susceptible hosts. They are im portant allies of man in his effort
to replace toxic chemicals with non-toxic, biological means in the
conservation of the environment of mankind. The importance of
diseases as reducing factors has often been disregarded in studies
on insect ecology and population dynamics. Most cases of mortality
in carefully watched experiments have simply been characterized as
"natural mortality," neglecting the fact that there is no "natural"
mortality before the insects have finished their life assignment,
the deposition of their eggs. The environmental factors including
the pathogens are responsible for any other than natural mortality
of the larvae, pupae and young adults of the pests. It is rather
difficult to distinguish the different symptoms of a disease in
insects. Therefore they are not noticed and their influence on
populations is overlooked. We feel that a series of photographs of
different stages of a collection of insect diseases could help such
workers in a general orientation and we are sure from own
experience that each specialist needs some broader oriented guide
for the fields bordering his own homeland."
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