. Current topics in forest entomology : selected papers from the XVth International Congress of Entomology, Washington, , 1976. Forest insects Congresses. % 18-. Date July August September Figure 1.—Percentage of male moths caught in disparlure-baited traps by date, with total number caught in the low and high concentration traps — Albenwald 1975. Table number of L. monacha males per trap with two disparlure concentrations Mean number of males Change in mean number Site per trap of males per trap 1974 1975A 1975B 1975A/74 19758/74 1975B/75A Percent Albenwald 48 8 79 -37 5 + 6
. Current topics in forest entomology : selected papers from the XVth International Congress of Entomology, Washington, , 1976. Forest insects Congresses. % 18-. Date July August September Figure 1.—Percentage of male moths caught in disparlure-baited traps by date, with total number caught in the low and high concentration traps — Albenwald 1975. Table number of L. monacha males per trap with two disparlure concentrations Mean number of males Change in mean number Site per trap of males per trap 1974 1975A 1975B 1975A/74 19758/74 1975B/75A Percent Albenwald 48 8 79 -37 5 + 61 9 +159 St. Niklaus 33 3 23 66 -30 9 + 98 2 +187 Herbriggen R 33 72 3 -47 6 +119 1 + Herbriggen L 21 7 27 53 7 +24 4 +147 5 + Randa R 33 23 32 -30 3 - 3 + Randa L 22 21 -78 6 - 4 5 + Tasch R 18 7 10 -69 5 - 46 5 + 43 Tasch L 11 7 9. 7 -76 9 - 17 1 +259 Table of the number of L. monacha males in disparlure-baited traps and the forested area possibly influenced by the attractant Total number of males Estimated forested area Change 1975 compared Site in traps below the traps (ha) to 1974 Total no. Forested 1974 1975 1974 1975 Males area Percent Albenwald 293 420 7 + + 100 St. Niklaus 100 , 267 2 +167 + 190 Herbriggen R 99 269 + + Herbriggen L 65 242 • + + 140 Randa R 99 165 + + 100 Randa L 66 77 + + 100 Tasch R 56 47 - + Tasch L 35 37 + + 400 male moths attracted, however, was markedly less than the increases in forested area. In Tasch R, there was even a decrease. Herbrig- gen L is again an exception. There the percent increase in moths attracted was almost twice the increase in forested area! This is an additional indication (other than the evidence of table 3) that the nun moth popula- tion had probably increased locally at this particular site. Table 5 shows the flight period and maxi- mum catch period, as well as the
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