COPY
BRANCH OF FOR ST ENTOMOLOGY,
EN
Forest Research Institute & College,
Dehra Dun, U.P.,
INDIA.
15th January, 1929.
Dear Marshell,
With regard to your enquiry of 19th December 1928
about Dendrolimus punctata I am sorry I cannot supply any first hand
information. In India the only trouble from species of Dendrolimus
on pines has occurred in the Jaintia Hills on Pinus khasya; here
D. repanda, and D. latipennis in association with Lebeda nobilis
have at times caused wholesale defoliation in open natural pine
forests. The trouble usually starts in the older trees, while
young evenaged crops which are in some parts raised artificially
on a short rotation for fuel do not form favourable centres for the
start of defoliation.
Pupation occurs on the ground-cover and collection
by hand is not impracticable.
As a cultural remedy the isolation
of the age-classes in a properly distributed series is indicated.
These species occur far beyond the range of Pinus
khasya and have other foodplants.
on the
In Corea where Dendrolimus spectabilis is a serious
pest of pine forests I understand work is in progress
parasites at the Forest xperiment Station, Government General of
Chosen, Seoul. Possibly ir. Jozo Murayama, Forest Entomologist
for Corea may have some experience or control measures and I am
forwarding your enquiry to him.
I have no information immediately available on the
pine forests of Hongkong but if these are artificial plantations
of special value I think the destruction of cocoons by hand as an
annual preventive measure would have to be accepted. Under similar
silvicultural conditions in India this is the first measure one
would consider.
Yours sincerely,
(Signed) C.BEESON.
Το
Dr.G.A.K.Marshall.
Forest Entomologist.
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