Studies Related to Firewood and the Spread of Invasives Robert Haack USDA Forest Service Northern Research Station East Lansing, MI 15.

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Presentation transcript:

Studies Related to Firewood and the Spread of Invasives Robert Haack USDA Forest Service Northern Research Station East Lansing, MI 15 April 2008

How many insects are there? Over 1 million described species Estimates of 2-30 million In the US: about 100,000 species Important roles of insects

Pathogens Can be Moved in Firewood Dutch elm disease Oak wilt Beech bark disease Butternut canker Some insects are hitchhikers

Nutritional Ecology of Bark & Wood Borers Typical length of borer life cycle Inner Bark1 year or less Sapwood1-2 years Heartwood2-3 years Xylem: Xylem: upward movement of water & minerals Phloem (or Inner Bark): downward movement of sugars

Coleoptera (Beetles) Scolytidae: bark & ambrosia beetles (>6,000 W, >560 NA) 1 or more generations per year most common. Bark beetle adults and larvae feed on the inner bark of trees. Ambrosia beetle adults and larvae bore into the wood and feed on fungus.

Coleoptera (Beetles) Buprestidae: metallic wood borers (>15,000 W, >700 NA) 1-2 year life cycle most common.

Coleoptera (Beetles) Cerambycidae: longhorned beetles (>20,000 W, >1200 NA) 1-3 yr life cycle most common

Hymenoptera (Bees, Ants, Wasps) Siricidae: woodwasps (100 W, 20 NA) 1-year life cycle most common

Lepidoptera (Butterflies & Moths) Sesiidae: clearwing moths (1,063 W, 115 NA) 1-2 year life cycle

Lepidoptera (Butterflies & Moths) Cossidae: carpenter moths (650 W, 45 NA) 1-2 year life cycle

As Wood Moisture Content Decreases Larval Development Time Lengthens: A few records! Buprestidae Buprestis aurulenta Normally a 2-4 year life cycle 9 years from handrails 26 yrs from structural timbers 30 years from furniture 50 years from window sill Cerambycidae Eburia quadrigeminata Normally a 2 year life cycle 25 years from flooring 40 years from a bookcase

29 Exotic Borers discovered in Exotic 2 Exotics 3 Exotics 4 Exotics 6 Exotics First found in 17 states 5 Cerambycids 1 Siricid 3 Buprestids 20 Scolytids 12 ambrosia, 8 bark beetles

Acer - Maple Aesculus - Buckeye Ailanthus - Tree of heaven Albizzia – Silk tree Alnus - Alder Asimina - Pawpaw Betula - Birch Carpinus - Hornbeam Castanea - Chestnut Corylus - Hazel Crataegus - Hawthorn Eucalyptus - Eucalyptus Fagus - Beech Ficus - Fig Fraxinus - Ash Lindera- Spicebush Litsea - Pondspice Malus - Apple Morus - Mulberry Persea - Redbay Platanus - Plane Populus - Aspen Prunus - Cherry Quercus - Oak Robinia - Black locust Salix - Willow Sapindus - Soapberry Sassafras - Sassafras Tilia - Linden or Basswood Ulmus – Elm Abies - Fir Cedrus - Cedar Chamaecyparis - Cypress Cupressus - Cypress Juniperus - Juniper Larix - Larch Picea - Spruce Pinus - Pine Pseudotsuga - Douglas-fir Thuja - Cedar Tsuga - Hemlock Tree Genera Infested by the 29 New Borers 30 HW 11 SW

EAB Survival in Firewood EAB Exit Holes/m2 Month WholeSplit July 9 4 Aug29 6 Sept6125 Oct6832 Dec7875 EAB emergence in 2004 and 2005 from the same 10 ash bolts 36 EAB in in 2005

186 pieces split > 11 tree species Current or Prior Insect Infestation No44% Yes 56% Current 16% Prior40% April 2008 Survey of Confiscated Firewood at Mackinaw City, MI

19 of the 186 Pieces were Ash Current or Prior Insect Infestation in No 1 Yes 18 Current: 1 (cerambycid) Prior: 17 (10 had EAB)

2 Apple 1Ash 3Aspen 19 Beech 35 Birch 3 Boxelder 23 Cherry 5 Cottonwood 12Elm 13Hickory 92 Hornbeam 88 Oak 5 Silver maple 45 Sugar Maple 48 Red pine 24 Spruce 418TOTAL

Will EAB Emerge Through Plastic Bags? Plastic bags were “contractor grade” clear, 4 mil thick (= 4/1000 inch or 0.1 mm). Single bagged 1 adult emerged Double bagged 0 adults emerged Study led by Therese Poland

Argentina Brazil Canada China Estonia France Germany Guatemala Honduras Hong Kong Indonesia Japan Liberia Lithuania Malaysia Mexico Nigeria Paraguay Philippines Singapore Sri Lanka Taiwan UK Vietnam 1996 $12,875, ,219, ,101, ,248, ,292, ,975, ,094, ,174, ,229, ,867,605 Total $ 66,079,638 Department of Commerce, U.S. Census Bureau, Foreign Trade Statistics Did you know that the US imports firewood?

In Summary Insects are commonly associated with firewood There is a higher risk of infestation if the firewood is from recently cut live trees, is whole, and has bark. Bark-free firewood that has seasoned for at least 2 years is at a lower risk of being infested.