Traps at different heights were tested. Those 0.5 m above ground level caught about 40% more beetles than those 1,5 m ‘high. beetle population. Proposals for governmental economic support were made. and changes in laws and regulations were suggested. Both government and parliament responded positively to the proposals, and a control program was established during I979. Learn about pheromones for men | Wordpress.com
A. Long-Term Measures
The major long-term recommendation was to stimulate increased harvesting of the overmature forest stands. Government funds were to be used to support road construc- tion in areas with overmature stands, logging operations on steep terrains, and the purchase of modern logging equipment. An information campaign was also started to convince the forest owners of the necessity of cutting their mature timber before the beetles kill the trees and otherwise reduce their value. Learn more at http://thongchaimedical.org/?p=176
As another long-term measure, the law was amended to prevent storage of unbarked logs in forest areas during summer. Cleanup after storm damage and logging operations was also required.
B. Short-Term Measures Two short-term measures were recommended:
l. Cutting and removal of beetle-infested trees in June and July before the adult beetles of the next generation emerge. Compensation for the logging of such trees was made at a certain rate per cubic meter.
2. Mass trapping with pheromone-baited drainpipe traps, or insecticide-sprayed log sections baited with pheromones. The state supplied pheromone dispensers free of charge and subsidized one third the cost of the trap. The civil forest administration, which covers most of the forest area, was responsible for local administration, as well as for the distribution of traps and instructions to the forest owners.
III. THE MASS-TRAPPING PROGRAM
A. Traps and Pheromones
About 600,000 traps were set up in areas where trees had been killed by the beetles in 1978. The traps were made of polyethylene tubes, 12.5 cm in diameter, 135 cm long, with about 900 holes just large enough (3 to 4 mm) to allow beetle passage. The tubes were capped at the top and had a funnel at the base leading to a collecting bottle. A phero- mone dispenser was attached inside the tube.’
The dispensers contained methylbutenol, cis-verbenol, and ipsdienol in ratio |50:7:l. They are marketed by Borregaard Ind. Ltd., Sarpsborg, Norway, and pro- duced by Celamerck, Ingelheim, West Germany (plastic bag formulation) and Health- Chem Corp., New York, N.Y. (laminated plastic-tape formulation). Learn about pheromone cologne for 2015 | Solenoidrocks.com
Log sections sprayed with lindane and baited with the pheromone dispensers were applied only on a minor scale. The sections cut from recently felled trees were about 1 m long. Beetles that land on the surface and start boring are killed by the insecticide.
B. Principles for Trap Distribution
The district forest service officer was responsible for deciding on the number of traps that should be set up in each district. The recommendation was to set up one trap for every 3 to 5 trees killed by the beetles the previous year. The traps were preferably to be used in areas with minor infestation. Mass trapping was not recommended.
edit @ 25 Apr 2016 21:23:26 by lusharson8884
edit @ 5 Jun 2016 18:45:03 by lusharson8884