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Wavyleaf Basketgrass

Wavyleaf Basketgrass * (Oplismenus hirtellus spp. undulatifolius) Back to Weeds Wavyleaf basketgrass is an exotic, invasive grass that was first found in Maryland in 1997, including parts of Patapsco State Park. It grows in dense patches in wooded natural areas preventing the growth of native...

Seiridium and Botryosphaeria canker of Leylands - Trees

Photo: Botryosphaeria canker on branch of Leyland cypress Back to Common Problems - Trees and Shrubs Both Seiridium and Botryosphaeria are fungi that cause dieback in Leylands planted in the landscape. The first symptoms are yellowing or fading of the foliage on scattered lateral branches that...

Mulch

Photo: Andrew Koeser, International Society of Arboriculture, Bugwood.org Mulching to reduce weeds, conserve soil moisture, and minimize soil erosion is a standard horticulture practice. Plants that are not mulched correctly can experience problems, decline, and even die from too much mulch piled...

Lawns - Tips for Weed Control

Back to control options Tips for lawn weed control: Proper fertilizing, mowing, and reseeding bare spots will produce a healthier lawn, thicker lawn, less susceptible to weed infestations. Identify the weed . This helps with selecting the proper herbicide, knowing the proper time to apply it, and...

2016 Annual Report

Download a PDF copy of the 2016 Annual Report

Aphids Got your Milkweeds

(Oleander aphids) (Aphids and Monarch caterpillar) Milkweeds are under assault from an alien insect, the oleander aphid, Aphis nerii . These little orange insects suck the sap out of stems, leaves, can cause flowers and pods to abort, and can even kill plants. They concentrate milkweed toxins in...

Invasive Species test

Invasive Diseases Invasive Insects Invasive Plants

Armored (Hard) Scale - Trees and Shrubs

Euonymus scale Also look at Soft scale Back to Common Problems - Trees and Shrubs Scale insects belong to a large group of sucking insects that attack a wide variety of trees and shrubs. Generally, they are divided into two categories, armored (hard) and soft scale. Heavy infestations may cause...

Soft Scales - Trees and Shrubs

Cottony camellia scale Back to Common Problems - Trees and Shrubs Armored (h ard scales) Scale insects belong to a large group of sucking insects that attack a wide variety of trees and shrubs. Generally, they are divided into two categories, armored (hard) and soft scale. Heavy infestations may...

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