Registration and control of the nun moth Lymantria monacha L.
Monitoring of Lymantria monacha (L.) was carried out in forest stands at 112 localities in Denmark in 1980-82 using open-sheet sticky traps treated with disparlure. Males were caught in the traps at all localities, the highest numbers being recorded in the larger plantations of spruce [Picea]. In general, captures increased slightly from 1980 to 1981 but fell considerably in 1982. The effectiveness of monitor traps in detecting local outbreaks was poor, since captures decreased to background levels within 1 km. In experiments with microencapsulated disparlure using the pheromone confusion technique, 2.5-3 times fewer eggs and larvae were found in the treated area as in untreated ones.