Christmas Tree and Landscape Pest Mgmt Newsletter
CHRISTMAS TREE AND LANDSCAPE PEST MANAGEMENT NEWSLETTER
Volume 4, No. 2 April 8, 1994
Editors: Paul Heller, Professor of Entomology, PSU Rayanne Lehman, Entomologist, PDA
****INTRODUCTION: Scouting activities were initiated in late March and there has been very little pest activity until this past week, when moderating temperatures brought some pests and plants out of dormancy. Please refer to special comments on Pine Shoot Beetle.
**** CHRISTMAS TREE SCOUTING REPORT # 2 - April 8, 1994
COOLEY SPRUCE GALL ADELGID: In eastern Carbon County overwintering stages of this adelgid remain active on Colorado blue spruce. Use your handlens to look for the small black or gray nymphs at the base of needles and on the underside of twigs.
Immature nymphs continue to be observed on the undersides of needles of infested douglas fir at the same site. Remember, the overwintering nymphs are smaller on douglas fir than on Colorado blue spruce.
EASTERN SPRUCE GALL ADELGID: These insects remain active as spring temperatures increase. The infested site was located in eastern Carbon County.
NORTHERN PINE AND PALES WEEVILS: Adults were detected in upper York County on April 7. They were located beneath pine discs scattered throughout the field.
RHABDOCLINE NEEDLECAST: Rhabdocline symptoms continue to be visible on douglas fir plantations scouted in Carbon, Schuylkill, and York Counties.
WHITE PINE WEEVIL: No evidence of white pine weevil activity has been observed at monitoring sites in Allegheny, Blair, Carbon, Centre, Perry, Wayne, and York Counties. Growers should check terminals of their white pine for fresh droplets of clear sap, an indication that adults are feeding. You need to manage this pest before adult females lay eggs in the hosts' terminal leader.
WINTER BURN: Significant winter burn is evident on douglas fir, Colorado blue spruce, concolor fir, and red pine in Carbon County. Some trees appeared bicolored - healthy around the base and wind burned in the middle and top. The healthy area is a good measure of how much snow cover was present in your plantation.
**** SPECIAL NOTE ON PINE SHOOT BEETLE
PLANT PROTECTION AND QUARANTINE (PPQ) HIGHLIGHTS FOR WEEK ENDING APRIL 8, 1994. Pine Shoot Beetle (PSB) - The first PSB adult flight activity for 1994 was observed in northern Indiana (state) and southern Michigan (state) on March 6, 1994. In the same area, much heavier flight periods occurred from March 20-24. In northcentral Ohio, Dr. Dave Nielsen, Ohio State University, reported PSB flight activity on March 22, 23, and 24 when daytime temperatures were in the mid-70's.
**** GROWING DEGREE DAY ACCUMULATIONS as of April 3.
Based on maximum and minimum temperatures reported for nearest weather reporting stations and a base temperature of 50 degrees F..
Allentown: 4 GDD Altoona: 10 GDD Erie: 9 GDD Harrisburg: 12 GDD Pittsburgh: 20 GDD Scranton: 5 GDD State College: 6 GDD
**** PLANT PHENOLOGICAL INDICATORS
Allegheny County: Coltsfoot was beginning to bloom. Carbon County: Bud swell of red maple flowers and crocus in full bloom (no cultivar noted). York County: Red maple in flower and forsythia buds starting to show yellow.
Note: The information presented here may not accurately reflect pest conditions at your site. We encourage Christmas tree growers to scout their own trees to assess pest activity and determine need for management tactics.
Where trade names are used, no discrimination is intended and no endorsement by The Pennsylvania State University or Pennsylvania Department of Agriculture is implied. Every attempt is made to produce information that is complete, timely, and accurate, the pesticide user bears the responsibility of consulting the pesticide label and adhering to those directions.
The Pennsylvania State University is committed to the policy that all persons shall have equal access to programs, facilities, admission, and employment without regard to personal characteristics not related to ability, performance, or qualifications as determined by University policy or by state or federal authorities. The Pennsylvania State University does not discriminate against any person because of age, ancestry, color, disability or handicap, national origin, race, religious creed, sex, sexual orientation, or veteran status. Direct all affirmative action inquiries to the Affirmative Action Office, The Pennsylvania State University, 201 Willard Building, University Park, PA 16802-2801.
Issued in furtherance of Cooperative Extension Works, Acts of Congress May 8 and June 30, 1914, in cooperation with the U.S. Department of Agriculture and the Pennsylvania Legislature. L.F. Hood, Director of Cooperative Extension, The Pennsylvania State University.
+----------------------------------------------------------------------------+ P.R. Heller, Prof. Entomology Penn State University, University Park, PA 16802 Internet Address: PHELLER@PSUPEN.PSU.EDU R.D. Lehman, Entomologist, Bureau of Plant Industry Internet Address: RLEHMAN@PDA001.PADER.GOV K. Valley, Entomologist, Bureau of Plant Industry PA Department of Agriculture Harrisburg, PA 17110 Internet Address: KVALLEY@PDA001.PADER.GOV
May 2, 1994 Document Number: 29001112 +----------------------------------------------------------------------------+
Keywords: BENEFICIAL-INSECT, CHRISTMAS-TREE, COOLEY-SPRUCE-GALL-ADELGID, CTLPM, ENTOMOLOGY, GROWING-DEGREE-DAY-ACCUMUL, HELLER-PAUL, INSECT, LEHMAN-R, NEWSLETTER, PENN-STATE, PENN-STATE-COLLEGE-AG-SCIENCES, PENNSYLVANIA, PEST, PEST-MANAGEMENT, PEST-SCOUTING, PINE-SHOOT-BEETLE, PLANT-PHENOLOGICAL-INDICATOR, TURFGRASS-PEST, VALLEY-K, WHITE-PINE-WEEVIL