Category Archives: Arboriculture

PbD arboriculture and tree consulting

CODIT

One of the most beautiful explanations of an elegant natural system : Compartmentalization of Decay in Trees or CODIT

Developed and described by Alex L. Shiga Plant Pathologist, U.S. Department of Agriculture, Forest Service, Northeastern Forest Experiment Station, Durham, New Hampshire and Harold G. Marx Research Applications Staff Assistant, U.S. Department of Agriculture, Forest Service, Washington, DC

Watercolor illustrations by David M. Carroll, Warner, New Hampshire.

https://www.nrs.fs.fed.us/pubs/misc/ne_aib405.pdf READ the full text and VIEW the clear illustrations.

“The CODIT system is based on two major points. First, a tree is a highly compartmented plant. Second, after a tree is wounded, the resulting defects are compartmentalized”…

by Alex L. Shiga and Harold G. Marx

2020 Urban Tree of the Year : Celtis occidentalis

Info brought to you by Casey Trees
Celtis occidentalis or the common Hackberry
Celtis occidentalis or the common Hackberry CREDIT: Blog Post By Jona Elwell January 27, 2020 Casey Trees

…“The hackberry has for centuries lived a life of unassuming existence – a wonderful shade provider from the Elm family with its shares of upsides and downsides – that no doubt lives up to its oft-cited nickname: ‘the unknown tree.’ When given the opportunity of rich, moist, open soil it has the potential to reach nearly 100’ high and last for well over a century – but most often it’s considered a medium-sized tree found in parks and wetlands, parking lots and open yards”… READ MORE

What the heck is Integrated Pest Management?

Besides being wonderful, IPM–Integrated Pest Management–is a sustainable, environmental approach to managing insect pests in our gardens and other managed urban and suburban landscapes. The acronym need not be mysterious or intimidating, on the contrary, IPM will become your “Go To” once you get to know it!

Friends of Foes? Psocids, also known as bark lice, hanging out on a Cherry Tree. Psocids are fungivores, not damaging to the tree. (photo : adele medina o’dowd)

IPM Control Tactics start to finish…

Monitor Key Pests and Key Plants : Learn what to look for in your own garden and decide which areas, plants and trees are most important to you. (If, for example, Azaleas and Rhododendrons are important, get help from the UMD extension office website.) Get assistance in diagnosing and strategizing, as needed. Pruning by Design can help you with this!

Cultural and Sanitation Practices : Add biodiversity and native plants to your yard, include disease resistant plants, maintain plant health, mulch, reduce habitat and soil stresses. Make sure irrigation is not too much or too little. PbD can help you with this!

Mechanical and Physical Controls : PbD can help you with this! PRUNE! Prune out infestations and hand pick to remove problem insect pests, use high pressure water spray to blast them off. Prune to encourage airflow and remove disease vectors.

Biological Controls : Implement these after working with other good plant health care practices, encourage or establish predatory insects such as lacewings and lady beetles to pray on pests like aphids, attract and support birds in your own garden, add beneficial nematodes in your soil, strive for a natural balance of predator and pray insects in your yard so that pest outbreaks are less likely. PbD can help you with this!

Chemical Controls : Last Resort, use organic and inorganic pesticides only on a prescription basis, applied by professionals. There is real and present danger for pollinators and other beneficial insects, as well as humans, when they are used in our neighborhoods. Check out your pesticides with the OMRI, Organic Materials Review Institute. PbD does not use chemical controls.

Don’t use fertilizers. Nitrogen, common in nearly every fertilizer, can actually promote secondary pest outbreaks that are worse than the first infestation, sigh!