Investigation of the Silviculture Treatment Effects on the Quantitative and Qualitative Characteristics of Infected Stands of Boxwood Blight Disease(Case study district No: 1 Gombol watershed No: 26-Lahijan township)

In recent years, blight or boxwood blight, caused by a fungus, has spread from Western Europe to the Hyrcanian forests. In this study, the aim is to investigate the effect of breeding operations that reduce the humidity and temperature of these populations in controlling this disease.

For conducting a surface study equivalent to 3 hectares in series 1 of Gombl in Lahijan forests was selected, part of which was intact and as a control and part also had a forestry plan. All trees in two stands by 100% measurement method and variable diameter equal to chest for all species and small variables equal to diameter, collar diameter, height, number of reproductions in three classes as well as qualitative variables of trees Boxwood was recorded and analyzed statistically including the percentage of leaf freshness, branches and crowns of trees.

Based on the results of quantitative variables of canopy diameter, height, cross section and number of regenerations in the height class less than 1.3 m and the vigor of leaves, branches and trunks of boxwood trees in the managed massif were evaluated with better conditions. Only the number per hectare of total reproductive area in the control area was better.

According to the results obtained in this study, it can be said that management practices in the populations infected with boxwood blight by reducing the moisture trapped under the canopy of trees, prevent the spread of disease and resistance of rootstocks to this disease Increases.