Organic Apple Pest Management. Matthew J. Grieshop PhD Michigan State University
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1 Organic Apple Pest Management Matthew J. Grieshop PhD Michigan State University
2 Not Your Granddad's Orchard... Gone are the days of big trees Orchards over the years... Old style orchard density: >500/acre Modern density: 600, 1000, 1200 /acre
3 Small is Beautiful...
4 Pests of Apples Insects Disease Weeds Orchard Lifespan Year 1 Year 5 Year 20
5 The first question... Where/How do I sell my apples Local-Direct vs. Regional Fresh market vs. Processing market Whole vs. Value added (e.g. juice, crunch packs, cider)
6 The second question... How do I know what to do? SCOUTING: of ultimate importance in apple PM Many, Many pests The worst are well described Use phenological models to guide scouting and PM tactics Apr egg laying hatch Pheromone Trap egg laying hatch egg laying hatch May June July Aug Sep Oct OFM Flight
7 Weeds: Friend, Enemy, or Neighbor?
8 Gravenstein et al. 2006
9 Weed Management: Young Trees Site preparation: multiple years of cover crops Mulches: Wood, Straw, Synthetic Cover crops: "CHOOSE YOUR WEED"
10 Weed Management: Older Trees Mowing: 2-3 times per season Light tillage Grazing Flaming
11 Weed Management: Complications Rodents like cover Weeds or Mulches Girdle and kill trees
12 Weed Management: Complications Arthropod diversity tied to plant diversity NE's and pollinators Also some pests: Stinkbugs, Mites, Aphids
13 Diseases of Apples Two major pathogens: Apple Scab Fire Blight Many minor pathogens: Flyspeck, sooty bloch, blossom blast, powdery mildew, rusts... Sooty Blotch and Flyspeck
14 Apple Scab: Venturia inaequalis
15 Apple Scab Primary infection Sexual cycle Infects leaves Secondary infection Asexual cycle Infects leaves and fruit
16 Apple Scab Management: Bottom Up Resistant Varieties Liberty, Crimson Crisp, Empire Most effective tactic Problem?? Liberty Empire Crimson Crisp
17 Apple Scab Management: Bottom Up Sanitation: Clean up leaves Competitive/ antagonistic BC... Mechanism? Predation by earthworms and other shredders Fall fertilizer applications (High N) Flail Mowing Leaves
18 Apple Scab Management: Top Down Copper is the most effective fungicide Cannot be used on soils with high Cu Sulfur is also effective Bicarbonates not as effective (e.g. Kaligreen, Armicarb, Baking Soda) Short residual activity Less disruptive?? }Manage Minor Diseases
19 Apple Scab Management: Top Down Cu and S have broad activity Kill beneficial fungi and bacteria Kill/Repel Earthworms Disrupt predatory mites Disrupt other NE's?
20 Fire Blight: Erwinia amlovora Bacterial pathogen Infects shoots, blossoms, wood Can rapidly kill trees May be carried by pollinators Like scab is tied to humidity and temperature conditions
21 Many Insect/Arthropod Apple Pests!! Moths/Worms Beetles Flies Aphids Mites
22 A Survey of Direct Apple Pests and Top Down PM Codling Moth (CM) and Oriental Fruit Moth (OFM) Plum Curculio (PC) Apple Maggot (AM)
23 Monitoring insects in heromone traps for oth pests ower traps for plum urculio phere traps for apple aggot raps tell us if we have a roblem! orchards
24 Codling and Oriental Fruit Moths Small brown moths native to Eurasia Apple Damaged by Codling Moth Larvae (worms) develop inside fruit CM: apples, pears, walnuts, quince OFM: stone fruits, apples, and pears
25 CM/OFM General Life History Adult moths lay eggs on or near fruit Larvae emerge and bore into fruit Larvae emerge from fruit and seek place to pupate Moths emerge and cycle begins anew
26 CM/OFM General Life History Both pests are serious in MI apple production Codling Moth CM are larger than OFM CM have copper band on wings Oriental Fruit Moth Phenology is slightly different
27 CM Phenology Apr May Jun Jul Aug adults Bloom PF egg laying hatch Degree-days (base 50 F post-biofix) Two flights per season
28 OFM Phenology egg laying hatch egg laying hatch egg laying hatch Apr May June July Aug Sep Oct Three flights per season
29 CM/OFM Pest management Apr May Jun Jul Aug adults Bloom PF egg laying hatch Degree-days (base 50 F post-biofix) Chemical tactics target eggs and larvae Behavioral tactics target adults Biological tactics target all stages Physical tactics target late larvae
30 CM Chemical Pest Management Cover sprays are applied to egg or early larval stage of each generation Air Blast Sprayer Granulosis Virus (CM only) Entrust (Spinosad) Horticultural Oils (during egg laying)
31 CM Behavioral Pest Mating disruption with synthetic sex pheromones Easy for OFM, Harder for CM Very specific and provides season long management Cornerstone of organic CM and OFM management
32 CM/OFM Mating disruption Females produce a unique odor that attracts males Mating disruption adds lots of synthetic odor sources This confuses males, prevents mating, and infested fruit
33 CM/OFM Biological Pest Management Release natural enemies Trichogramma Parasitic nematodes $$$$Expensive!!! Trichogramma Conserve natural enemies Encourage diversity Nematodes
34 CM/OFM Physical Pest Management Sanitation: Debris provides pupation sites Banding: Cardboard or burlap bands as pupation sites Bands are destroyed prior to next generation emergence Can also be used as a means of sampling the population
35 Small dark weevil Native insect adapted to apples Attacks stone and small fruit Larvae feed within the fruit Especially difficult for Organic apples Plum Curculio
36 Plum Curculio General Life History Adults emigrate into orchard in Spring Females cut crescent and lay eggs in flap Fruit drop from trees Larvae pupate in soil and emerge in late Summer Adults feed on apples Spring Damage Summer Damage
37 PC Chemical Tactics Cover sprays applied in Spring or at Harvest Surround Kaolin clay Pyganic Pyrethrum
38 Apple Maggot Small fruit fly Native insect adapted to apples Attacks apples, hawthorne, some native berries Adult Fly Maggot Damage
39 Females emerge late June- September Lay eggs in fruit Larvae feed and develop Larvae pupate in soil and emerge following year Apple Maggot Life History
40 AM Chemical Tactics Kaolin Treated Apples Cover sprays/gel baits applied for active period Pyganic, Entrust Kaolin clays GF-120 Sprayer
41 AM Cultural Tactics Mass trapping using sphere traps Can be combined with insecticides Requires multiple traps per tree Very effective but labor intensive
42 AM Biological Tactics Spiders Earwigs Predatory Bugs Ground Beetles Conservation of natural enemies
43 Apple Pest Management: The Future Quantify suppressive potential of soils Quantify impact of Fungicides on soil ecology and insect pest management Development of scab specific OMRI approved fungicides Refinement of Swiss Sandwich systems Reintegration of animals into orchards...
44 Pest Management with Hogs Young hogs grazed on dropped apples 5-fold decrease in summer PC damage 3-fold decrease in CM damage Major reduction of weed stands Impact on Scab, AM, Rodents?
45 Pest Management with Fowl Weeder Geese in Orchards Clark and Gage 1996 Marginal impact on Insect damage over a single year
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