Report Number 15 Library and Archives Canada Cataloguing in Publication Data
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Pest Management Report Number 15 Library and Archives Canada Cataloguing in Publication Data Main entry under title: Summary of forest health conditions in British Columbia. - - 2001 - Annual. Vols. for 2012- issued in Pest management report series. Also issued on the Internet. ISSN 1715-0167 = Summary of forest health conditions in British Columbia. 1. Forest health - British Columbia - Evaluation - Periodicals. 2. Trees - Diseases and pests - British Columbia - Periodicals. 3. Forest surveys - British Columbia - Periodicals. I. British Columbia. Forest Practices Branch. II. Series: Pest management report. SB764.C3S95 634.9’6’09711 C2005-960057-8 Front cover photo by Joan Westfall: Pine needle sheathminer damage south of Prince George 2016 SUMMARY OF FOREST HEALTH CONDITIONS IN BRITISH COLUMBIA Joan Westfall1 and Tim Ebata2 Contact Information 1 Forest Health Forester, EntoPath Management Ltd., 1-175 Holloway Drive, Tobiano, BC, V1S OB2. Email: [email protected] 2 Forest Health Officer, Ministry of Forests, Lands and Natural Resource Operations, PO Box 9513 Stn Prov Govt, Victoria, BC, V8W 9C2. Email: [email protected] TABLE OF CONTENTS Summary ............................................................................................................................................. i Introduction ......................................................................................................................................... 1 Methods .............................................................................................................................................. 3 General Conditions ........................................................................................................................... 7 Damaging Agents of Pines ............................................................................................................... 11 Mountain pine beetle, Dendroctonus ponderosae ................................................................... 11 Dothistroma needle blight, Dothistroma septosporum ............................................................ 14 Pine needle sheathminer, Zelleria haimbachi ......................................................................... 16 Pine needle cast, Lophodermella concolor ................................................................................. 17 Neopdiprion sawfly, Neodriprion spp. .................................................................................. 17 White pine blister rust, Cronartium ribicola ............................................................................ 18 Western pine beetle, Dendroctonus brevicomis ....................................................................... 18 Hard pine stem rusts ............................................................................................................... 19 Elytroderma needle blight, Elytroderma deformans .............................................................. 19 Damaging Agents of Douglas-fir ..................................................................................................... 20 Douglas-fir beetle, Dendroctonus pseudotsugae ..................................................................... 20 Western spruce budworm, Choristoneura occidentalis ......................................................... 22 Laminated root disease, Phellinus weirii ................................................................................ 23 Douglas-fir tussock moth, Orgyia pseudotsugata ................................................................... 24 Damaging Agents of Spruce ............................................................................................................. 25 Spruce beetle, Dendroctonus rufipennis ................................................................................... 25 Eastern spruce budworm, Choristoneura fumiferana ........................................................... 27 Damaging Agents of True Fir ........................................................................................................... 28 Western balsam bark beetle, Dryocoetes confusus ................................................................. 28 Two-year-cycle budworm, Choristoneura biennis ................................................................ 30 Balsam woolly adelgid, Adelges piceae .................................................................................. 31 Damaging Agents of Hemlock ......................................................................................................... 31 Western blackheaded budworm, Acleris gloverana ............................................................. 31 Western hemlock looper, Lambdina fiscellaria lugubrosa ..................................................... 31 Damaging Agents of Larch ............................................................................................................... 32 Larch needle blight, Hypodermella laricis .............................................................................. 32 Damaging Agents of Cedar .............................................................................................................. 33 Yellow-cedar decline ................................................................................................................ 33 Weather related cedar damage ............................................................................................ 33 Damaging Agents of Deciduous Trees .......................................................................................... 34 Aspen (serpentine) leaf miner, Phyllocristis populiella .................................................... 34 Forest tent caterpillar, Malacosoma disstria ........................................................................ 36 Venturia blight, Venturia spp. ............................................................................................. 37 Western winter moth, Erannis spp. ................................................................................... 38 Gypsy moth, Lymantria dispar ............................................................................................. 39 Birch leafminer, Fenusa pusilla ............................................................................................ 39 Satin moth, Leucoma salicis .................................................................................................. 40 Aspen decline ........................................................................................................................ 41 Septoria leaf spot, Septoria populicola ................................................................................ 42 Cottonwood leaf rust, Melampsora occidentalis ................................................................ 42 Bruce spanworm, Operophtera bruceata ............................................................................. 42 Damaging Agents of Multiple Host Species ................................................................................ 43 Abiotic injury and associated forest health factors ............................................................ 43 Unknown foliage disease ....................................................................................................... 47 Animal damage ....................................................................................................................... 48 Armillaria root disease, Armillaria ostoyae ........................................................................... 50 Unknown defoliator damage ............................................................................................... 51 Miscellaneous damaging agents .......................................................................................... 51 Forest Health Projects ...................................................................................................................... 54 Forest Health Meetings/Workshops/Presentations ................................................................. 68 SUMMARY The 2016 Summary of Forest Health Conditions in British Columbia (BC) is based on forest health data collected from the 2016 provincial aerial overview surveys (AOS) and other BC Forests, Lands and Natural Resource Operations (FLNRO) sources. The AOS information is the main source for reporting on damaging agents by host tree species. This data can be augmented by detailed helicopter surveys, insect population assessments, pathogen and insect ground surveys, lab examinations of samples and ground observations by trained personnel. Abstracts of special projects, meetings and presentations as well as publications undertaken in 2016 by FLNRO entomologists, pathologists and their associates are included in the final sections of the report. th th Approximately 84% of the province was surveyed between July 6 and September 29 , in 669 hours by 24 surveyors and 11 aircraft companies. Nearly 5.9 million hectares (ha) of damage was mapped. The noted disturbances were caused by at least forty-seven forest health factors affecting many different commercial tree species. This only included damage visible from the elevation at which the AOS is flown, which under-represents some damaging agents, in particular some diseases. Bark beetle mortality continued to be the primary disturbance mapped in BC, with 3.8 million hectares affected. Primarily trace to light intensity western bark beetle infestations totalled 3.3 million hectares; damage was scattered