Tamarack Pests

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Seasonal changes in mean supercooling point (±SEM) of larval and adult Dendroctonus simplex. ELB are freeze intolerant -16C (+3.2F) -17.5 (+1.4F) -43F -49C (-56F) -56F Rob Venette NRS, MN -42C (-43F) Abby Walter U of MN 28
Predicted impacts of winter low temperatures on Eastern larch beetle populations Larvae are extremely cold-tolerant –most survive winters. Low winter temperatures increased 0.25C /yr 1964-2004. Adult survival has increased 0.7% /yr from 1964-2004. Greater overwintering success by ELB and may lead to increased tree mortality Minimum annual temperature (°C) -24 -26 -28 -30 -32 -34 -36 -38 -40 -42 -44 -46 0.0 1960 1965 1970 1975 1980 1985 1990 1995 2000 2005 Winter temperatures for Isle, MN Year Larval survival Adult survival just south of Mille Lacs Lake 1.0 100% 0.8 80% 0.6 60% 0.4 40% 0.2 20% From -Proceedings Society of American foresters, 2008, Reno, Nevada In Press- Forrest Health Monitoring 2008, National Report 29 8 0 % Proportionate survival (predicted)
Page 1 and 2: Tamarack Pests • Mostly found on
Page 3: Larch sawfly Found around the world
Page 6 and 7: Stem decays Ontario 1950’s Phelli
Page 8 and 9: Fungi Isolated from Eastern Larch B
Page 10 and 11: Outbreak since 2000 Likely cause st
Page 12 and 13: Larch beetle mortality 2000 through
Page 14 and 15: August 2011 14
Page 16 and 17: Tamarack mortality due to Eastern l
Page 18 and 19: Reproductive biology Brood 1 Summer
Page 20 and 21: Black backed woodpecker 20
Page 22 and 23: What is causing the eastern larch b
Page 24 and 25: What is causing the eastern larch b
Page 26 and 27: Overwintering of ELB Confusion in t
Page 30 and 31: Currently……. I still do not kno
Page 32 and 33: Research Background Only two major
Page 34 and 35: Research Studies of insect biology
Page 36 and 37: Research The influence of tamarack

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