S2It is in old-growth stands of this sort that U.S. Forest Service researchers at the Bartlett Experimental Forest in Bartlett, New Hampshire, have established large-scale studies to provide needed information on northern hardwood management practices. To enable interested visitors to see some of these management practices more conveniently, four small demonstration plots have been established on the Forest (fig. 1). This paper describes those plots and points out their efficacy and value as demonstrations of four specified management programs.S3.

v | ok | Kirjasto Aj-k | Varastoinnin vaikutus lindaanilla kuorrutettujen siementen itävyyteen ja kuorrutuksen tehoon kirppojen ja kaalikärpästen torjunnassa

The efficacy of dieldrin (1–0.0009% on fabrics), Mitin (16–0.156%), and Eulan U33 (6–0.0058%) was tested with 30-day-old larvae of Tinea pellionella (L.) and 25-day-old larvae of Tineola bisselliella (Hum.) at 25° C and 75% RH, raised on dried fish and yeast. With higher concentrations of the proofing agents, all larvae died within one or two weeks, and the damage was 0.05–4 mg per 10 larvae, depending on the concentration. With less proofing agent, the damage in the first week (20–35 mg) was increased in the next three weeks to a total of 130–200% of the first amount, the mortality was low, and pupation began from the third week. At concentrations between these, the damage was 7–10 mg and the mortality was 100%. All three mothproofing agents were somewhat more effective against Tineola than Tinea. As compared with the Attagenus larvae, these clothes moths are slightly less susceptible to dieldrin, more susceptible to Eulan U33, and show about the same susceptibility to Mitin.