Tree Doctors is proud to be a division of Bartlett Tree Experts, and our staff now has the backing of an international tree-care company and tree research laboratory to help continue providing excellent tree service and shrub care in the West Chester, Pennsylvania region. View a complete list of professional tree services offered by Bartlett.
Home & Gardens Landscape  ~  Tree Doctors Dx & Tx
    (610) 269-8733          (diagnostic & treatment) 
Expert In Horiticultural Care, Tree & Shrub Diagnostics and Care serving Chester, Delaware,and Lancaster Counties Since 1990



What are those purple boxes hanging from trees in Chester County PA??  They are lures and traps for a devastating insect we expect to see soon! Oh no!  Emerald Ash Borer is an introduced species of insect that attacks ash trees.  Control is difficult if not impossible. Infected trees must be removed and destroyed. Prevention is the best way to avoid problems!

  IF YOU HAVE ASH TREES! Contact our office for important information about Emerald Ash Borer.


You may lose all your Ash (Fraxinus sp.) trees to these pests.

In an attempt to erradicate Emerald Ash Borer, Argriculture officials in Maryland have begun cutting down 25,000 trees in an 11,500-acre swath of forrested and developed land in southern Prince George's County.

Illinois, Indiana, Michigan, Ohio and now, Maryland AND PENNSYLVANIA have taken steps to erradicate the bug.  It is important to get rid of it by spring.  That is when the insects, which are currently in larval form living in the bark of infested trees, will emerge as adults.

The insect was found in the HARRISBURG area and suspected in KENNETT SQUARE!   The goal is often to remove all of the ash trees within a 1.5 mile zone around the infested tree.  The state of Maryland has also quarantined all ash wood and all hardwood firewood from leaving the area of Prince George's.  If you see one, attempt to contain it in a baggie and contact the office.

Asian Longhorned Beetle!  DEVASTING at 2" - 3" in size.
Brought in from China, this insect is moving toward our area! 

In Spring:
  Eastern Tent Caterpillar is one of the first pests that gets notice. Pictures below. 
Prophylactic treatments for Japanese Beetles, Bronze Birch Borer, Lacebugs, Leafminers, Aphids, Adelgids, Mealybugs, Scales, Thrips, Whitefly, Pine Tip Moth Larvae, Elm Leaf Beetle, Sawfly Larvae, Leafhoppers, White Grub Larvae begin now. 

By the end of June; the following insects/bugs can be found feeding or active in ornamentals: Bagworms have hatched and must be treated ! White Pine and Spruce Weevil damage must be removed. Dogwood Borer Adults are active. Honeylocust plant bugs are feeding. Leafhoppers are feeding. Juniper webworms are active. Pine needle scales can be treated. Elm Casebearer can be treated. Lacebugs can be treated. Ash/Lilac borers can be treated. Spider Mites can be treated. Boxwood psyllids can still be feeding. Hemlock scales can be treated.

BAGWORMS ARE OUT!!!  Treat bagworms after they hatch!
In SE Pennsylvania, Maryland, Delaware and New Jersey they can be expected to hatch by July 1st.  TREAT NOW!

Through July and August;
watch for more Japanese Beetles, Fall Webworm, sap flow in cherries, mushrooms on the base of trees, carpenter ants on the move, Scales on Magnolia, Mites and insects that inhabit the base of Poplars!

Fall Webworms! 

By September:  Bagworms are going through metamorphosis and can not be treated now.  But it is critical to get on the list of properties to be treated in spring and summer.  Each female bagworm can turn into 500 eggs and caterpillars for next year!  Fall Webworms are active. Hawthorne lacebugs, Mites active, Hemlock Wooly Adelgid, Red Headed Pine Sawfly, Pine bark adelgid, Rust Mites, Spider Mites, Tulip Tree Scale, Juniper Scales.             

In September: Aphids, Rust mites, Scales, Lace bugs, Hemlock Adelgid, Ash/Lilac borers, Peachtree borers, Red mites, Spider mites, Japanese beetles STILL around! Whitefly

October: Mites, preventative treatments for overwintering insects.

November: Feed your plants to increase vigor.  Vigor aids in resisitance to problems.

Begin anti-dessicant sprays to prevent, "winter burn" around Thanksgiving.  Then reapply once a month.

If you suspect a problem in your landscape, please call now to schedule treatments! 

WINTER: Time to rejuvenate your landscape beds. Many planting beds have terrible soil. We bring in rich, organic compost and using our unique methods, "air-till" the life-giving compost into your existing soils giving your plants an incredibly rich blend of organic nutrients! 











Hemlock woolly adelgid is an introduced species and can be controlled with persistence. 

Anytime mushrooms or "conks" are found, the tree is  

in serious trouble and may be a hazard!  This tree is ready to FALL! 

Fireblight is a serious bacterial disease
of many species. This crabapple has a dark, sunken canker that will kill the tree.

 Eastern Tent Caterpillars love cherries, crabapples and others.
(thanks to the US Forest Svc.) 

Pine Bark Adelgids feeding through the bark of pinespinebarkadelgid.jpg    

 Mites are devastating critters.  Actually related to spiders and not an insect.  They can destroy Dwarf Alberta spruce, cotoneaster, spruce, azalea, pine, juniper, fir, burning bush and many more.

 lacebug1.png Andromeda lacebug damage (left) and beautiful adult.

NOTE: Due to the incredibly wet weather, expect many foliar problems associated with fungal pathogens.  Trees planted in low lying areas that are not tolerant of wet soils may experience problems associated with root rot, especially if the soil in which they are planted is clay.

crabapplescab-bobmulrooney.gif                crabapple_scab_fruit_smallmulrooney.gif
Crabapple Scab leaves and fruit.  Soon, the leaves will yellow and drop.
(Photos thanks to Bob Mulrooney, All around great guy, Univ of DE)

2bags1.png   BAGWORMS!          

  We've had Black knot, a fungal disease of the Prunus family (think stone-fruits) described to us as, "A dead mouse, wrapped around the branch!"

 Gypsy moth larvae(caterpillars) love Blue Spruce!

At left, this mature Peach tree borer and its larvae on right are one of many types of flying
insects that one way or the other, are boring into and destroying trees!
Some deposit their eggs within or on the bark of trees.  The eggs hatch and eat within
the trunk, roots or branches.  Others just bore right in and feast.  Some insects have "aggregation" pheremones, which "call" others into the susceptible host tree.

Below is a partial list of the plants attacked by borers:
peach, plum, apricot, cherry, dogwood, birch, lilac, rhododendron, ash, apple, azalea, boxelder, cottonwood, pine, locust, poplar, willow, oak, maple, elm, hickory, plane tree, sycamore, persimmon, walnut, pecan, olive, linden, sweetgum, ginkgo, beech, crabapple, clematis, viburnum, blakgum, redbud, hackberry, honeylocust, sassafras, hawthorn, quince, shadbush, cotoneaster, osage orange AND MANY MORE!

610.269 TREE (8733)

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