Review:
Pest treatment has come a long way since the broadcasting of
substances like arsenic. The demands of successive generations
for safe pesticides has meant that a variety of chemicals has
been used. Some, such as DDT, have returned in another guise
in that their original effectiveness (or possible over-effectiveness)
is now argued as a lesser evil. Set against these is the idea
that every pest must have a predator and that all is required
is for that organism to be let loose and all will be well. Living
in Australia we've seen the folly of that simplistic view but
the idea of integrated pest management (IPM) still has a great
deal of mileage. This current volume reviews the linkages between
theory and practice with the same goal as earlier pesticides
- effective, cheap and safe.
Of
course, IPM wouldn't be an issue if it wasn't for one species
- people. We alter ecosystems and place organisms in monocultures
and then wonder why it goes wrong. Chapter one highlights the
problems we've caused and how we got into them as well as some
ways out. If this is a review of how we got into the situation,
chapter two highlights some of the ideas behind modern IPM showing
both development and prospect. Chapter three moves on to consider
one of the key basics of the system - population analysis -
from the points of view of both pest and predator. Pests are
not just there to be acted upon, their behaviour renders some
treatments more suitable than others. As chapter four outlines,
it is essential that we understand behaviour every bit as much
as other basic ecological principles. This idea is carried on
in the next chapter which discusses at some length, the use
of pheromones to disrupt mating behaviour. Another behavioural
element is feeding. If we know more about how, where and when
we can better target pest species. Other species are also involved
and so the distribution of organisms becomes part of this equation.
Pest control is one side of the fence and conservation the other.
However, as chapter seven makes clear, there is a need to look
at both elements to see how we can maintain biodiversity whilst
also controlling pest species. Up to this point, the general
direction of the book has been centred on the pest itself with
variations on behaviour, location etc. Chapter 8 marks a move
towards looking at the other direction. As we know all too well,
predator species can get out of control (again, Australia is
a classic case here). It's not just changing feeding preferences,
there are a range of other, equally important, issues that need
to be taken into account. Mirroring the ecology of pests in
an earlier chapter, chapter 9 looks at how plants can become
better at dealing with pests from ecological and genetically
modified aspects. Although a great deal of IPM comes from observation
and field trial there is an increasing need for modelling although
this is seen as a more complex process than the usual ecological
models largely because of the need to examine a wider range
of factors in pest control. We return to more empirical material
with chapters 11 and 12 looking at the ecology of weeds and
vertebrate pests respectively. Here, the idea is that we gain
understanding by looking in detail at the pest as well as the
predator. In a similar fashion, chapter 13 and 14 are linked
by an interest in studying the wider ecological picture through
ecosystems and agroecology respectively. The aim in the former
is to find ideas that can be used in the latter to manipulate
pest species. Chapter 15 examines the role molecular ecology
can play in understanding pest species. Finally, chapter 16
discusses the issues that can arise when pesticides get out
of the system and interfere with non-pest organisms.
There
is a great deal of information here that is not readily put
together in one place. As such it highlights the strides that
IPM has made from the earliest times. It also shows how far
we still have to go is there is any hope of finding the "magic
bullet" referred to early in the text. The very detailed
nature of the information means that it is really not a beginners
text although anyone with some knowledge of pest control would
find no difficulty in finding much of interest. As such this
makes it a ideal text for the teacher looking for ways to extend
current ideas of pest management to look at how the next generation
might be developed.