Lexington, Kentucky 40546
      
Nursery Update - A University of Kentucky Cooperative Extension Service update for the Kentucky Nursery Industry
  
By Amy Fulcher, Extension Associate - Nursery Crops
  
University of Kentucky Department of Horticulture
  
Update #5
  
August 27, 2002
  

Prune No More!
Pruning is generally not recommend beyond mid to late summer in order to allow trees to harden off before cold weather arrives. Late pruning can result in new, tender growth that will not be able to survive cold temperatures.

 

Photo: Late pruning, late growth during the first cold spell.
 

Insects:
Banded ash borers emerge and fly mid-August through September. Banded ash borers attack ash trees and appear to prefer green ash.

One can determine when to spray by using known flight times or scouting tree trunks for adult exit wounds. On young trees the action threshold is 2 or more holes with fresh sawdust per tree. Pheromone lures and traps for clearwing borers allow for monitoring populations before spraying.

To identify a sample on a tree trunk or on a trap look for a dark wasp-like body with thin, yellow stripes on the abdomen. Insect samples can be sent to UKREC via the county Extension office for I.D. and control recommendations. Both sides of trunks should be sprayed with Dursban or Lindane.

Sources: U.K. Pub. ENT-43, Insect Borers of Trees and Shrubs; Purdue Pub. E - 213, Developing an Integrated Pest Management Program for Nurseries; and U.T. Pub. PB1589 Commercial Insect and Mite Control for Trees, Shrubs, and Flowers.

Photo: Adult banded ash borer. Photo by Joe Collins.

   
Sources of IPM supplies:
Great Lakes IPM (IPM Products, live insects, traps, pheromones)
10220 Church Rd. NE
Vestaburg, MI 48891
517-268-5693
(f)517-268-5820

 

Gempler's (IPM supplies, pheromones, traps)

IPM Laboratories (beneficials)
Main Street
Locke, NY 13092-0300
315-497-2063
(f)315-497-3129
   
Disease:
Many foliar diseases no longer warrant spraying. Foliar diseases that normally require control, become less important as the end of the growing season draws near. The reduction in photosynthesis and plant growth is minimized as the season progresses. Damage that is merely cosmetic on trees that won’t be sold this season should not be controlled.

Keep in mind that because plants are sold based on appearance, even cosmetic diseases are important during the season that trees will be sold. This is particularly important for container crops that may be sold while the trees are in leaf.
Source: Arborist News. October 2001. “Treeage: A Practical Plant Health Management Decision-Making Tool”
Photo: Phyllosticta leaf spot on maple, a cosmetic disease.
   
Cultural:
Mid-August to late-September is the best time to seed or reseed grass row middles. Grass strips can reduce erosion and stabilize row middles.

Crimson red clover should be seeded in row middles mid-August to mid-Sept. Care should be taken to purchase inoculated seed and to avoid small liners.

Photo: Vegetation can help control weeds and stabilize soil. Photo by Dr. Laura Jull.

 
Source: U.T. Field Nursery Task Calendar, Mark Halcomb; U.K.publication AGR-50, Lawn Establishment in Kentucky.

 

Educational programs of the Kentucky Cooperative Extension Service serve all people regardless of race, color, age, sex, religion, disability, or national origin.

Educational:

KNLA Summer Outing
Thursday, September 5, 2002

Schedule of Events

8:00 a.m. - 8:45 a.m. Registration (Arboretum Center)

8:45 a.m. - 9:00 a.m. Welcome from KNLA President, Hugo Davis & Bernheim Horticulture Director, Dr. Paul Cappiello

9:15 a.m. - 10:15 a.m. and 11:00a.m. and 12:00p.m.** Keynote Speaker, Don Shadow, Shadow Nursery, Inc. Concurrent: Exhibitors/Tour #1 Exhibitor time & demonstrations AND Bernheim Nursery Tour will be given by Dr. Paul Cappiello & Bernheim Staff and/or Dr. Bob McNiel of the University of Kentucky

12:30 p.m. - 2:00 p.m. Live Barbecue Lunch by Bayou Bluegrass Catering

2:00 p.m. - 4:00 p.m. Exhibitor time & demonstrations &Tour #2 of various Bernheim plant sites

4:00 p.m. - 5:30 p.m. Exhibitor time & demonstrations (continued) AND Watermelon Social (sponsored by University of Kentucky) & Raffle drawing (must be present to win!)

** "New and Unique Plants For the Landscape" is the title of Mr. Shadow's keynote presentation. Mr. Shadow has just returned from a trip to Japan and is anxious to share with you slides from his trip and the new varieties of plants discovered. Don Shadow is the Owner/President of Shadow Nursery, Inc. in Winchester, Tennessee. Shadow Nursery, Inc. is a wholesale nursery specializing in woody ornamentals, rare and unusual plants. Mr. Shadow is past-president of his state association in Tennessee, Southern Nursery Association, and the International Plant Propagator's Society-Eastern Region. Mr. Shadow is a fourth generation nurseryman.

Questions? Call Betsie A. Taylor at (502) 848-0055. Fax Registration to (502) 848-0032.
Registration Deadline - September 2nd!
$25 per person, bring 4, the 5th person is free if registered by September 2nd.

Educational programs of the Kentucky Cooperative Extension Service serve all people regardless of race, color, age, sex, religion, disability, or national origin.

Note: Trade names are used to simplify the information presented. No endorsement by the Kentucky Cooperative Extension Service is intended, nor is criticism implied of similar products that are not named. Always read product label before use.