Dear Forest Researchers,
Pine wilt disease have become a more and more serious pest in northern part of
Japan. We had a very hot and dry summer (1994), so that the huge volumes of pine
trees died from this disease.
Pine wilt disease is a syndrome caused directly by a pine wood nematode. This
nematode is carried by the Japanese pine sawyer, Monochamus alternatus
(Coleoptera). It is necessary to stop the dispersal of this insect vector to
prevent the spread of this disease.
We are planning to make a barrier in the expanding front of the disease; all
pine trees will be removed in a belt to slow the spread. THE FIRST QUESTION IS
THAT HOW WIDE THE BELT SHOULD BE? We do not expect a perfect effects to this
barrier. We also do some effort to eliminate all new isolated populations (ones
that leap beyond the barrier zone). Then there is a trade-off of putting the
barrier zone close to the infested and spending a lot of money on spraying and
less money on detecting new populations, or moving it away from the generally
infested area and spending more money on detecting new infestations but very
little money on spraying.
We appreciate your information about researches and/or trials dealing with the
similar problems. Thank you.
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kamatana@ffpri.affrc.go.jp
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Naoto Kamata
Forest Entomology Laboratory
Tohoku Research Center
Forestry & Forest Products Research Institute
Nabeyashiki 72, Shimokuriyagawa, Morioka
Iwate 020-01, Japan
TEL +81-196-41-2150
FAX +81-196-41-6747
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