The German producer prices for commercial wood products in July now clearly show the consequences of the bark beetle infestation for the prices of lumber. As the construction industry continues to enjoy robust growth, the cause of the fall in prices remains only the cheap raw materials that depresses the markets.    On a month to month comparison there is a mixed picture with only weak increases in prices for some products. Only five values ​​have risen, the highest being lumber at + 0.70%. Eight have not changed since June. 13 values ​​have dropped. The strongest downtrends were reported ...