Abundance and control of Lygus rugulipennis (Heteroptera: Miridae) on Scots pine (Pinus sylvestris L.) nursery stock |
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| Authors: | Jarmo K Holopainen Risto Rikala |
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| Institution: | (1) Ecological Laboratory, Department of Environmental Sciences, University of Kuopio, P. O. Box 6, SF-70211 Kuopio, Finland;(2) Finnish Forest Research Institute, Suonenjoki Research Station, SF-77600 Suonenjoki, Finland |
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| Abstract: | Population fluctuations of the European tarnished plant bug (Lygus rugulipennis Popp.) on nursery-grown Scots pine, Pinus sylvestris L. were monitored with sweep net samples over five growing seasons. The effects of cypermethrin, lindane and oxydemetonmethyl insecticide sprayings on the occurrence of Lygus adults and nymphs and prevalence of bud disorders of pine seedlings were studied. The number of Lygus bugs was highest in 1984, the first year of the study, and thereafter the annual levels of the bug declined, reaching a low in 1988. On 2- and 3-year-old Scots pine seedlings the numbers of overwintered L. rugulipennis adults and nymphs correlated positively with the occurrence of abnormal buds. Cypermethrin sprayings significantly reduced the numbers of Lygus nymphs in 1985 and 1987. In 1986 significantly fewer damaged seedlings and L. rugulipennis adults were found in pine transplants treated with cypermethrin. |
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| Keywords: | pine seedlings bud abnormality insects cypermethrin |
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