Articles
DISINFESTATION OF DRYOCOSMUS KURIPHILUS YASUMATSU IN CASTANEA SCION WOOD
Article number
1019_37
Pages
243 – 247
Language
English
Abstract
Studies were conducted to determine if high temperature treatment was a viable method of disinfesting Dryocosmus kuriphilus larvae in Chinese chestnut buds.
Preliminary experiments indicated that the warmest lethal temperature for Qing Chinese chestnut buds was influenced by the time of collection, diameter of the scion wood, and the duration of the heat treatment.
Forced-air heating with a programmable Tenney chamber and radio frequency heating in a custom built unit were problematic and more expensive methods of treating chestnut scion wood than hot water immersion in a recirculating bath. Qing scion buds from wood immersed in a water bath at 52 or 53°C for 10 min and grafted onto AU-Cropper seedling rootstock had 75 and 25% graft union success, respectively and produced scion growth without galls.
Untreated Qing buds had 80% graft union success, but galls formed on 42% of the successfully-grafted trees.
These results indicate that hot water immersion is an effective method for inducing D. kuriphilus larvae mortality in chestnut buds before growth begins in the spring.
Gall wasp larvae also were killed after hot water immersion of small galls attached to chestnut stems at ≥49°C for 5 min.
Preliminary experiments indicated that the warmest lethal temperature for Qing Chinese chestnut buds was influenced by the time of collection, diameter of the scion wood, and the duration of the heat treatment.
Forced-air heating with a programmable Tenney chamber and radio frequency heating in a custom built unit were problematic and more expensive methods of treating chestnut scion wood than hot water immersion in a recirculating bath. Qing scion buds from wood immersed in a water bath at 52 or 53°C for 10 min and grafted onto AU-Cropper seedling rootstock had 75 and 25% graft union success, respectively and produced scion growth without galls.
Untreated Qing buds had 80% graft union success, but galls formed on 42% of the successfully-grafted trees.
These results indicate that hot water immersion is an effective method for inducing D. kuriphilus larvae mortality in chestnut buds before growth begins in the spring.
Gall wasp larvae also were killed after hot water immersion of small galls attached to chestnut stems at ≥49°C for 5 min.
Publication
Authors
M.R. Warmund
Keywords
Asian chestnut gall wasp, bud wood, Castanea mollissima, grafting, hot water immersion
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