Invasive Species Update
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INVASIVE SPECIES UPDATE David Headrick Horticulture and Crop Science Department Cal Poly State University, San Luis Obispo INVASIVE SPECIES UPDATE Some who, what, where, when, why and how… Focusing on ID, damage, spread and some controls WHO? WHEN? Invasions in California are constant and the rate is alarming Plants Insects Plant pathogens PLANT INVASIONS www.sccgov.org PLANT SPECIES IN CALIFORNIA (JEPSON 1993) 1023 (17%) 1416 (24%) Native Species 3423 (59%) Endemic to CA Alien Species INVASIONS 1993 - 2003 315 exotic plant species discovered new to California between 1993 - 2003 = 1 every 12 days Of these, 18 (5.7%) were considered noxious weeds INSECT INVASIONS Photo courtesy of UC IPM Arthropod Species Exotic to California 1955-1988 (Dowell & Gill 1989) 18 16 14 12 10 8 6 4 Annual New Species New Annual 2 0 1950 1960 1970 1980 1990 YEAR PLANT PATHOGEN INVASIONS Tomato Yellow Leaf Curl Virus PATHOGENS Rate of fungal diseases reported Fisher, et al. 2012, Nature 484: 186-194 WHY? HOW? Increasing volume of global trade increases frequency of introductions Movement of infested plant materials Plenty of blame to go around FOCUS ON INSECTS WHERE? Introductions originate from all over the globe CA has a distinct south to north trend, but many species also introduced into northern CA INSECTS: Heteroptera: Red Bug, Brown Marmorated Stinkbug, Bagrada bug Homoptera: Sternorrhyncha: Asian Citrus Psyllid Lepidoptera: Light Brown Apple Moth Update: Polyphagous Shot Hole Borer HETEROPTERA: TRUE BUGS Red Bug, Scantius aegyptius (Hemiptera: Pyrrhocoridae) © Peter J. Bryant RED BUG Old World species widespread throughout Europe and Asia Observed in OC in 2009, expanding northward Not causing issues here, but many reports on finding large aggregations Alarming red color RED BUG CLUSTERS Aggregations will disperse in the spring SIMILAR RED BUGS Seed bug White-crossed seed bug © Peter J. Bryant © Ron Hemberger Small milkweed bug Large Milkweed Bug © Ron Hemberger © Peter J. Bryant BROWN MARMORATED STINK BUG BROWN MARMORATED STINK BUG Accidental introduction from Asia in the late 1990s First sighted in Pennsylvania, spread quickly Trapped in CA starting in 2005 Moving southward from Pacific NW SIMILAR BUGS Rough stink bug Eustichus stink bug © Peter J. Bryant © Ron Hemberger Consperse stink bug BMSB ID DAMAGE - AGRICULTURE Primarily damaging fruit – huge host range; tree fruits plus vegetables Prefer ripe fruit Toxic saliva creates Steve Jacobs, Penn State wounds at feeding site DAMAGE - URBAN Nuisance Pest – aggregations in the late summer and fall for overwintering Homes and other sheltered locations NUISANCE PEST usatoday.com 2011 http://flickriver.com/photos/tanyagin/5029863353/ BMSB AGGREGATIONS On Chinese pistache in Sacramento http://www.stopbmsb.org Baldo Villegas USDA-NIFA SCRI Coordinated Agricultural Project, BIOLOGICAL CONTROL New egg parasitoids may eventually be released, one showed up on its own in WA Trissolcus & Telenomus spp. © 2007 David E. Reed BAGRADA BUG © 2012 Ryan Johnson BACKGROUND African origins (also India, Pakistan, SE Asia, parts of Italy) Discovered in SoCal 2008 Wide host plant range (mainly crucifers, but also grasses and grains, potatoes, some legumes…) IDENTIFICATION ISSUES © 2008 John R. Maxwell Harlequin bug Bagrada bug EARLY FALL AGGREGATIONS J. Taylor, OC Parks AROUND THE HOME Darcy Reed, UC Riverside CROP DAMAGE Multi-crowned broccoli BLIND CAULIFLOWER MULTI-HEADED CABBAGE DIRECT DAMAGE TO FRUIT CONTROLS Cultural Chemical Biological – limited so far CULTURAL Adjust plantings in fall to avoid Bagrada at highest populations Must get beyond the 6 leaf stage – use transplants over direct seeding Host free periods and sanitation around fields not proven . Sweet Alyssum issues CHEMICAL Early season – pyrethroids – Asana Later season – neonicotinoids, avoiding these if possible due to bee issues Organic production challenging . Pyganic the most effective registered option for chemical control ASIAN CITRUS PSYLLID © Lyle Buss, U of Florida ACP 2008 ACP expanded range from Mexico into San Diego County Detections now as far north as Bay Area and Lodi Two approaches – eradication strategy and management strategy BIOLOGICAL CONTROL Tamarixia radiata – from Pakistan Mike Lewis, CISR Diaphorencyrtus aligarhensis – from Pakistan Mark Hoddle, CISR LIGHT BROWN APPLE MOTH Ksby.com LBAM Originally from Australia Detected in Bay Area in 2007 October: detection in SLO, has been on the coast since 2011 ID RESOURCES http://www.ipm.ucanr.edu/PDF/PMG/LBAMinCAnurseries.pdf LBAM QUARANTINES Quarantines restrict movement of certain plants/green waste Exempted Host List https://www.aphis.usda.gov/plant_health/plant_pest_info/lba_moth/downloads/exempted_host_list. pdf Slows research for California conditions . Limited chemical and biological controls . Bt and Spinosads targeting larvae NEWS FLASH! Polyphagous Shot Hole Borer moving into the central coast Trapping and then beetle activity in avocado groves in Santa Paula, Ventura Co. (early Nov.) ANOTHER VECTOR Two species of PSHB, each with different species of Fusarium Dieback Reproductive hosts: Avocado, Box elder, California sycamore, Coast live oak, White alder, Japanese maple, and Red willow (http://eskalenlab.ucr.edu/) PSHB Photo credit: Gevork Arakelian FUSARIUM DIEBACK SYMPTOMS Photo credit: A Eskalen, M. Dimson RESOURCES Basic info for PSHB and Fusarium in English and Spanish harvesting best practices shot hole borer symptoms on non- avocado host trees Suspect Tree Report AVOCADO COMMISSION Grower Information Mtg: Tuesday December 1st at the Ventura County Ag Museum, 926 Railroad Avenue, Santa Paula from 10:00am to 12:00pm APPROPRIATE RESPONSES Invasions are a process, not just an event… Address anything that looks out of place – early detection is best Make the effort to get ID from County Ag QUESTIONS .