Fall Webworms Are Coming!

Fall Webworm as their name implies used to occur later in the growing season with webs becoming present in many types of trees canopies from mid-August through September.  As of late these caterpillars are having two generations per growing season in the southern portion of our region for the first time due to warming temperatures and are making their presence known by constructing their webbed tents as early as June.  A second generation of this pest in one season puts trees and shrubs at risk of being infested twice, an increase in the pest population in the landscape and their spread from the original host plant to surrounding landscape plants.  Contact your professionals at North Eastern Tree Care if you see these tents forming to learn how to prevent them from causing damage to your ornamental trees and shrubs.

Adult Webworm females lay eggs on the bottom of leaves. After the caterpillars hatch they immediately start eating foliage and building a tent like web to cover and protect themselves from predators. They feed on a wide variety of trees including alder, elm, oak, hickory, birch, cherry, apple and willow to name a few. Their webs are not only unsightly but large populations feeding on young or newly planted shade trees, ornamental trees and shrubs can affect the plants health and appearance long-term. There are several ways to control this pest, call your professionals at Northeastern tree care today to learn how to protect your plants from Fall Webworm.

 

 
Photo by C Busak: Fall Webworm feeding on black cherry leaves in Late June through early July.

Black headed webworm UGA             –                  Webworm pic from Purdue

 

For more information. Contact Northeastern Tree Care or call 1-888-439-TREE today!

 

 

 

Boxwood Blight

Boxwood Blight: A widespread fungal disease that effects all Boxwood varieties. Therefore it is especially devastating to English and American varieties; Korean varieties show signs of resistance. The sticky fungal spores are dispersed by wind, animals and birds, shoes and loose clothing, garden tools, etc. It is also supported by hosts plants Pachysandra terminalis and Sarcococca species once in a landscape. The primary spread of blight is through introduction of  asymptomatic plant material to unaffected areas. Symptoms appear as small brown to black lesions on leaves and twigs, quickly spreading through and from plant to plant and across the landscape, leaves turn straw color and fall off.

There is no post infectious cure, infected plants should be removed from the landscape asap.  Fallen infected leaves should be collected ideally by vacuum and all material should be disposed of in a landfill.  The spores remain viable on infected leaves and soil for 5 years preventing the use of new Boxwood as replacement plant material. Prevention may be possible by applying fungicide to all leaves and twigs on a consistent schedule.  The times of fungal activity (spring and fall) which is difficult considering Boxwoods natural leaf/twig density.

How to take care of a Boxwood shrub to help reduce likelihood of fungal infection include:

  • Eliminate overhead watering sprinkler heads, converting to drip irrigation only where necessary.
  • Reduce supplemental irrigation to only during times of atypical drought.
  • Clearing excess debris from plant base to improve air circulation.
  • Pruning out dead parts of plant, pruning to lightly elevating plant canopy from ground and pruning to lightly thin canopy to improve air circulation.
  • Sanitize pruning tools prior to pruning and between plants.


For more information on battling Boxwood Blight, Contact Northeastern Tree Care or call 1-888-439-TREE today!