Forster, B.; Knizek, M.; Grodzki, W. (eds.) 1999: Methodology of Forest Insect and Disease Survey in Central Europe.
Proceedings of the Second Workshop of the illFRO WP 7.03.10, April20-23, 1999, Sion-Chateauneuf, Switzerland.
Birrnensdorf, Swiss Federal Institute for Forest, Snow and Landscape Research (WSL) 225-226.
THE SYSTEM FOR FOREST PEST AND DISEASES SURVEY IN SAXONY L.-F. Otto, Fachbereich Waldbau/Waldschutz
Sachsische Landesanstalt fur Forsten, D- 01827 Graupa, Bonnewitzerstr. 34
Introduction
This survey system has a long tradition in Saxony. It was established by PRELL in 1926. Until now, the system was developed and modified depending on demands of the forest offices and the structure of forestry in the country. Since 1996, 51 state owned district forest offices (Forstamter) with 363 forest stations (Reviere), 4 federal owned district forest offices, 2 municipal district forest offices and some big privat forest owners (for instance mining companies) operate the forests in Saxony.
The German law for plant protection (Pflanzenschutzgesetz § 34) and the Saxon forest law (Sachsisches Waldgesetz § 18) demand a survey system in forests.
The system for forest pest and diseases survey The system consists of two parts:
1. Continual observation
The foresters observe continually the stands from all owners concerning damages (biotic,
abiotic). 8 times in a year (spring, summer: monthly; autum, winter: once in a quarter) they report briefly observed damages to the district forest office. The report consists of three parts:
1. information on new infested areas or volume of wood/trees infested by the most important pests in the actual observation period,
2. information on other pests and damages with local importance, and 3. information on pest control activities done.
The report is separated in information on the state forests and the forests from other owners.
Every information is documented in a book (,Forstschutzkontrollbuch"). In the district forest office the information collected is summarized and sent to the Saxon State Institute for Forestry (Sachsische Landesanstalt fur Forsten).
2. Monitoring of important pests A special monitoring takes place for:
• L. monacha, Z. diniana, with pheromon traps,
• B. piniarius, D. pini, P. flammea, Diprionidae, C.abietis with soil search, and
• 0. brumata, T. viridana with photo- eclectors.
225
For this monitoring the same stands are used every year. The number of stands depends on the actual population develoment of the monitored species. In the Saxon State Institute for Forestry, the collected materials are analysed for healths, vitality and other parameters which are necessary for prognosis.
Both parts were realized by the foresters on the station level (1000- 1500 ha).
Assessments take place as:
• brief information (,Waldschutzinformationen") to the district forest offices and other forest organisations after every report period,
• recommendations for futher monitoring methods, and
• damage prognosis and recommendations for pest control.
Summary
The system for forest pest and diseases survey consists of permanent observations in stands and detailed monitoring of dangerous species. The intensity from some steps depend on the actual situation, for instance an outbreak from a insect pest. All information required is collected by the forest stations summarized by the district forst offices, assessed and interpreted by the Saxon State Institute for Forestry and returned to the foresters including recommendations.
226
