Articles by Martti Nenonen

The Finnish advisory organizations of private forestry provide education for forest owners on the problems concerning farm forestry. It is important that the methods in use would be able to prepare for the future development so that the teaching could lead to the most efficient learning. The present study was a survey research directed to all private forest rangers working in the District Forestry Boards in Finnish-speaking areas of the country. The inquiry was answered by 756 rangers, the returning rate being about 80%.

The results indicate that farm-forest owners have to be further educated. The education should be directed in the first place to method of artificial regeneration, cleaning-thinning, cutting operations and to the methods of physical work achievements. Particularly, it would be important to take care of teaching concerning cost calculation and economic planning. On the other hand, the enquiry indicated that, according to the opinions of the forest rangers, such skills belong most for the forest professionals and not for the farmers. According to the results, there is a need for development in the education given to farm-forest owners, as well as education of professional foresters.

The PDF includes a summary in English.

• Lindroos, E-mail: hl@mm.unknown
• Nenonen, E-mail: mn@mm.unknown
• Pesonen, E-mail: pp@mm.unknown

The aim of the study was to find out more about pine weevil (Hylobious abietis L.) injuries in Scots pine (Pinus sylvestris L.) seedling stands and their control by means of DDT. For this purpose, inventories were made of seedling stands established earlier. Control experiments were made on burnt areas by planting seedlings dipped in a DDT emulsion.

The results of the inventories show that injuries caused by pine weevils can, in certain circumstances, especially in seedling stands established by planting, cause the complete failure in artificial regeneration. The extent and quality of the injuries vary greatly according to planting method, treatment of the cutting area, age of the seedling stand, environmental factors, and weather conditions. The most extensive injuries occur in regeneration areas of old Norway spruce stands burnt after clear cutting and planted with Scots pine seedlings. Injuries are greater in seedling stands established by planting, especially after broadcast burning, than in seedling stands originating either from artificial or natural seeding. The quality of the patch for sowing or planting has a considerable effect on the quantity and character of the injuries: in a patch from which organic matter has been removed, injuries do not appear or they are slighter. Seedlings can be protected effectively and economically by dipping their tops up to the root collar, in a DDT emulsion before planting.

The PDF includes a summary in English.

• Nenonen, E-mail: mn@mm.unknown
• Jukola, E-mail: jj@mm.unknown