insects and disease - caroll guffy, ua cooperative extension service
TRANSCRIPT
Introduction Pine
◦ Pine Bark Beetles◦ Management Strategies◦ Pine Sawfly◦ Pine Diseases
Hardwoods Emerald Ash Borer◦ Oak Borer◦ Defoliators◦ Leaf insects◦ Disease
◦ Questions
Pine Bark Beetles
Three Main TypesSouthern Pine Beetle Turpentine Beetles Ips (3 different types)
Attack Loblolly & Shortleaf
All 5 occur throughout the SE
Southern Pine Beetle
The worst one of the bunch Builds up high populations fast 3 mm (1/8 inch) long & notched head In Arkansas, last outbreak about 19 years
ago Less common than other bark beetles
Symptoms of Attack
Bore into the living bark. Small pitch tube the size of a
small piece of popped popcorn.
Winding, S-shaped galleries, Blue-stain fungi in the
sapwood First indication is
discoloration of the foliage.
Photo by Forest Insects and Their Damage Photo CD vol. 1 no. 88. Gerald Lenhard, Louisiana State University.
Treatments
Spots usually have to be addressed to stop spreading
Salvage
Cut and leave
Cut and burn
Cut and spray
Descriptions of Ips Beetles Sixspined Ips
Largest Ips beetle: attacks lower 6 spines on hind end
Small Southern Pine Engraver Smallest: attacks top Second most destructive (SPB is #1) 4 spines on each side hind end
Eastern Fivespined Ips 5 spines on either side of hind end Size in between others Attacks middle portion of trunk
Signs of Attack
1st sign: yellowing foliagePitch tubes < ½ in. diameterWhen tree too stressed, only
visible sign is presence of brown dust in bark crevices
H, I or Y shaped egg galleriesExit holes look like bird shotBlue Stain
Spots usually die out during winter
Can get large before that time
May be too small to salvage
Treatments
Turpentine Beetle
The largest in the South Its size (5.0-8.0 mm) makes it easily
recognizable. Rounded hind end and no spines Attacks usually found on lower part of the
tree w/ pitch tubes > 1 in. diameter Not uncommon to attack largest tree Do not carry blue stain so tree might
survive
How to reduce likelihood of attack for all bark beetles
Encourage vigorous tree growth Wait until winter to harvest/prune when
beetle activity is high in your area Remove storm or lightening damaged
trees ASAP Minimize mechanical tree damage Most common in drought years
Pine Sawflies
Several different species◦ Black headed, Introduced,
Loblolly, Virginia, RedheadedLarvae attack last year’s
foliageCan stress treeUsually no control
necessary
Blue Stain Usually caused by bark
beetles (injury) Will almost always kill
tree. Usually not noticed until tree “flags”
Will develop in freshly cut trees
EAB in the US
EAB an exotic beetle found near Detroit in 2002.
Solid wood packing materials from Asia Ohio 2003 Indiana 2004 Illinois and Maryland 2006 PA and WV in 2007
EAB in the US (continued)
WI , MO and VA in 2008 MN, NY and KY in 2009 IA and TN in 2010 CT, KS and MA in 2012 NH, NC, GA and CO in 2013 NJ and AR in 2014 Pretty fast for a bug that can only fly 3-6
miles!
• Adults feed on ash foliage - cause little damage• Larvae feed on the inner bark of ash trees• Girdles and kills the tree
Cory Bostic 2014
EAB Tree Protection
Not economical for forest trees Not recommended until EAB activity has
been confirmed within 15 miles of intended application site.
Usually recommended 6 weeks prior to emergence
Annual retreatment after initial treat Could result in the loss of all ash in N
America
Management Strategies
If present consider removing ash trees any time there is a harvesting or thinning operation
Do Not Plant Ash! Insecticide treatment for
shade trees
Red Oak Borer
Native insect: always present Record breaking numbers
In the past 8 insects/tree Some 600 insects/tree
Several factors Overstocked Older low vigor stands Shallow, rocky sites
1st noticed in Ozark National Forest
Damage
2 year life cycle Severe damage to
lumber/wood Low populations may
not kill tree Can weaken trees
Oak Defoliators
Leaf rollersWalkingsticksSkeletonizerForest Tent CaterpillarDamage can be severe &
lead to stressHealthy trees recoverMore common in dry years
Hypoxlon Canker
Affect most oak speciesOther hardwoods also Id by sloughing bark Grayish slick placesBrown fungal sporesQuickly kills the treeUsually secondary to some
other stress (drought)No control except removal