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EFFECTIVENESS OF TRUNK-IMPLANTED ACEPHATE FOR THE PROTECTION OF CONES AND SEEDS FROM INSECT DAMAGE IN FRANCE AND CHINA

Published online by Cambridge University Press:  31 May 2012

Alain Roques ,
Jiang-Hua Sun ,
Xu-Dong Zhang ,
Gwennael Philippe  and
Jean-Paul Raimbault
Alain Roques
Affiliation:
INRA, Station de Zoologie Forestière, Ardon, F-45160 Olivet, France
Jiang-Hua Sun
Affiliation:
Department of Forestry, Northeast Forestry University, 150040 Harbin, China
Xu-Dong Zhang
Affiliation:
Da Xingganling Forestry Administration, 165000 Jagedaqi, China
Gwennael Philippe
Affiliation:
CEMAGREF, Graines et plants forestiers, F-45290 Nogent/Vernisson, France
Jean-Paul Raimbault
Affiliation:
INRA, Station de Zoologie Forestière, Ardon, F-45160 Olivet, France
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Abstract

From 1989 to 1993, trunk implants of acephate were tested for the control of seed and cone insect damage to conifer species in France and northeastern China. The treatments were promising for the control of the major pests that feed on cone and seed tissues, including cone flies, coneworms, and seedworms, in European and Siberian larch, Norway spruce, Scots and mountain pine. In contrast, acephate implants did not prevent seed chalcid damage nor that of gall midges in Douglas-fir, European larch, and Siberian larch. Treatment generally increased seed yield, but a significant increase in the number of filled seeds was seen only when chalcids and midges were absent. The 2-year effect of implants seemed limited. Acephate implantation did not seem to affect seed germination.

Résumé

L’implantation de capsules d’acéphate dans le tronc a été testée de 1989 à 1993 dans le but de réduire les dégâts causés par les insectes ravageurs des cônes et graines sur diverses espèces de conifères français et chinois. Les principaux ravageurs s’attaquant à la fois aux tissus du cône et aux graines, notamment les mouches des cônes, les pyrales et les tordeuses, ont vu leur impact significativement réduit dans le cas des mélèzes d’Europe et de Sibérie, des pins sylvestre et à crochets, et de l’Epicéa. En revanche, les implants n’ont pas eu d’effet sur l’attaque des chalcidiens des graines, ni sur celle des cécidomyiides dans le cas du sapin de Douglas, du mélèze d’Europe et du mélèze de Sibérie. La production de graines a généralement augmenté avec les traitements, mais le nombre de graines pleines par cône n’a augmenté que lorsque les chalcidiens ou les cécidomyiides étaient absents. La production à long terme offerte par les implants a paru limitée. Aucun effet néfaste sur la germination n’a été noté chez les graines des arbres traités.

Type
Articles
Information
The Canadian Entomologist , Volume 128 , Issue 3 , June 1996 , pp. 391 - 406
Copyright
Copyright © Entomological Society of Canada 1996

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