Managing Soilborne Plant Diseases and Arthropod Pests of Vegetables. Meg McGrath and Mary Barbercheck
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1 Managing Soilborne Plant Diseases and Arthropod Pests of Vegetables Meg McGrath and Mary Barbercheck
2 Crop Rotations Know Your Pest Reduce Pest Habitat Provide Beneficial Habitat Minimal Pesticide Use Above-Ground Diversity to Favor Beneficials Pest and Disease Suppression Healthy Soil Below-Ground Diversity Add Organic Matter Crop Rotations Minimize Tillage to Conserve OM Minimal Use of Synthetic Pesticides & Fertilizers
3 In 1 teaspoon of soil there are Bacteria Fungi Protozoa Nematodes 100 million to 1 billion 6-9 ft fungal strands put end to end Several thousand flagellates & amoeba One to several hundred ciliates 10 to 20 bacterial feeders and a few fungal feeders Arthropods Up to 100 Earthworms 5 or more
4 Ecosystem Services Provided by Soil Organisms Decomposition and nutrient cycling Carbon sequestration Maintenance of plant diversity Bioremediation Biological control of pests
5
6 Survival of Soilborne Pathogens and Insect Pests In crop debris In seed On alternate hosts (including weeds) As specialized, protective, dormant or quiescent stage (e.g., fungal sclerotia, nematode cysts, pupae) In insect or nematode vectors - pathogens As saprophytes or by omnivory
7 White Mold
8 Biocontrol of Soilborne Pests Mechanisms Direct action on pathogens + invertebrate pests: Competition (plant pathogens) Antagonism (e.g., antibiotic production) Predation Parasitism and disease Indirect (e.g., through host effect) Induced resistance Growth promotion
9 Biocontrol of Pests in Soil Approaches Conservation Augmentative Inundative Classical
10 Biocontrol of Pests in Soil Conservation Improve environment for beneficial organisms in field e.g., increase soil organic matter, minimize tillage, conserve surface residues Can favor some pathogens and pests!
11 Conservation Biocontrol Microorganisms in Soil Bacteria Actinomycetes Fungi Mycorrhizae
12 Conservation Biocontrol Predatory Microarthropods in Soil Ground beetle and Rove beetle larvae Mesostigmatid mite Japygid Pseudoscorpion Centipede
13 Conservation Biocontrol Soil Surface Beneficials Ground and Rove Beetles
14 Conservation Biocontrol Soil Surface Spiders
15 Soil Management and European Corn Borer (Phelan et al., 1995) 250 Organic Conventional ECB Eggs/Plant * Unamended NH4NO3 Manure
16 Biocontrol of Pests in Soil Augmentation Apply products or materials (e.g., compost) to augment beneficial organisms already present This approach builds populations of organisms already present but in numbers too low for effective pest management
17 Understory Management in Apples (Mathews et al. 2002) Predators a b b b Compost Control Herbicide Plastic
18 Understory Management in Apples (Mathews et al. 2002) 1.4 a 1.35 b Diameter (cm) b b Compost Control Herbicide Plastic
19 Biocontrol of Pests in Soil Inundation Apply products or materials in same manner as a pesticide This approach introduces large numbers of organisms for relatively fast-acting acting control
20 Products for Soil Arthropod Biological Control Steinernema spp. Heterorhabditis spp. Hypoaspis miles (predatory soil mites) Atheta coriaria (generalist predator)
21 Signs and symptoms of nematode infection
22 Biocontrol of Pests in Soil Classical Introduce a non-native native organisms to control a non-native native pest Intention is establishment of beneficial organism for long-term, low input pest management Introduce Establishment beneficial and control
23 Biocontrol of Pests in Soil Some Challenges Soil abiotic or biotic environment may not support sufficient numbers of beneficials for control Pest not present or in adequate number to support beneficials Some biocontrols are very specific. Others are generalists Environmental conditions affect efficacy; performance can be inconsistent
24 Biocontrol of Pests in Soil Regulations Microbial and chemical products claiming control must be registered as pesticides with US EPA. Must be registered in state. Beneficial macro-organisms organisms exempt from EPA registration Efficacy data not required for registration Safety to environment + nontarget organisms is focus of registration
25 Biocontrol of Pests in Soil Regulations Efficacy data from replicated experiments often lacking, especially for vegetable uses!! EPA/IR-4 4 Biopesticide Demonstration Grant Program
26 Bacterial and fungal biocontrol species in commercially-available disease-control products Gliocladium virens Trichoderma harzianum and other species Bacillus subtilis, B. pumilus, etc. Pseudomonas syringie Coniothyrium minitans Streptomyces sp.
27 Efficacy - Biocontrol Products - Greenhouse Ornamentals # Experiments Effective Ineffective Companion 0 3 Deny 0 1 Mycostop 0 4 PlantShield 0 4 Primastop 1 3 Rootshield 3 11 SoilGard 2 6 Pathogens: Pythium, Rhizoctonia, Fusarium, Thielaviopsis
28 Mycostop Biofungicide Label Contents Keep Out of Reach of Children CAUTION PRECAUTIONARY STATEMENTS Hazards to Humans and Domestic Animals Harmful if inhaled. Avoid breathing dust or spray mist. Causes moderate eye irritation. Avoid contact with skin, eyes or clothing.
29 AGRICULTURAL USE REQUIREMENTS Use this product only in accordance with its labeling and with the Worker Protection Standard, 40 CFR Part 170. This Standard contains requirements for the protection of agricultural workers on farms, forests, nurseries and greenhouses, and handlers of agricultural pesticides. It contains requirements for training, decontamination, notification and emergency assistance. It also contains specific instructions and exceptions pertaining to the statements on this label about personal protective equipment (PPE) and restricted-entry interval. The requirements in this box only apply to uses of this product that are covered by the Worker Protection Standard. Do not enter or allow worker entry into treated areas during the restricted-entry interval (REI) of 4 hours. Exception: If the product is soil injected or soil incorporated, the Worker Protection Standard, under certain circumstances, allows workers to enter the treated area if there will be no contact with anything that has been treated. PPE required for early entry to treated areas that is permitted under the Worker Protection Standard and that involves contact with anything that has been treated, such as plants, soil or water is: Long-sleeved shirt and long pants Waterproof gloves Shoes plus socks Dust/mist filtering respirator with MSHA/NIOSH-approval number prefix TC-21C or a NIOSH-approved respirator with any approval number prefix N-95, R-95 or P-95 or HE filter.
30 Products for Soil Arthropod Microbial Control Microbial Control Bacillus (Paenibacillus) popilliae Bacillus thuringiensis var. israelensis Beauveria spp.
31 Suppression of Plant Disease Induction of Systemic Acquired Resistance Systemic Acquired Resistance Plant Growth Promoting Rhizobacteria Other Microbes Compost Vetch Mulch
32 Suppression of Cucumber Beetles/Corn Rootworms and Bacterial Wilt Beetles feed on cucurbits, prefer plants high in bitter cucurbitacin PGPR reduce bitter cucurbitacins Less attractive to beetles Less damage and bacterial wilt
33 Amending Soil with Compost to Increase Activity of Beneficial Microbes that Suppress Pathogens or Induce Resistance
34 Compost Soil Amendment - Tomato Organic - Farm - Cannery-waste Compost Anthracnose reduced in 1998 (high rate) Conventional - Plots - Yard-waste Compost Anthracnose incidence NOT affected Bacterial spot reduced in Foliar disease severity increased. Research conducted at OSU,
35 Phytophthora Blight
36 Amending soil with compost
37 Annual Compost Soil Amendments 20 dry tons/a = wet tons/a. Spread and incorporated in June Brewery-waste waste compost. Pumpkin Yard-waste compost. Sweet corn Yard-waste compost. Snap bean Yard-waste compost. Pumpkin.
38 Efficacy of Brewery-Waste Compost for Phytophthora Blight in Pumpkin Treatment % Blighted # Good Fruit (17 Sept 2001) (20 Sept 2001) Nontreated 70 a (13-99) 20 a (4-41) Compost * 81 a (4-100) 12 a (0-48) * 45 wet tons/a (20 dry tons/a) spread on 5 June 2001, then incorporated. Pumpkins direct-seeded on 28 June 2001.
39 Impact of Compost Amendments, Organic Matter (std Soil Analysis) Treatment June 2003 Sept 2004 May 2005 Nontreated Compost * * wet tons/a (20 dry tons/a) applied June 2001, 2002, 2003, Soil sampled before compost amendment. Rotation: pumpkin, sweet corn, snap bean, pumpkin.
40 Impact of Compost Amendments, Particulate Organic Matter (2003) Treatment <250 µm 250 µm-2 2 mm > 2 mm Nontreated Compost * * wet tons/a (20 dry tons/a) applied June 2001, 2002, 2003, Rotation: pumpkin, sweet corn, snap bean, pumpkin.
41 Compost-amended Plots 7/28/04
42 Efficacy - 4 Years of Compost - Phytophthora % Fruit with Phytophthora Treatment 13 Oct 1 Nov Nontreated 8 a (0-38) 23 a (0-67) Compost * 4 a (0-17) 20 a (2-48) * 40 wet tons/a (20 dry tons/a) applied June 2001, 2002, 2003,, Rotation: pumpkin, sweet corn, snap bean, pumpkin.
43 Mycorrhizal Inoculants Arbuscular mycorrhizae aka endomycorrhizal fungi Natural symbiotic fungi - healthy roots Root system larger and more active Plants tolerate root pathogens Reduced growth of pathogens Increased host resistance? Competition for resources?
44 Using Cover Crops for Control of Fruit Rot in Pumpkin Hairy vetch and/or rye. Research in OH + MD: suppression of Fusarium fruit rot, gummy stem blight, Microdochium blight. Also powdery mildew.
45 7/28/04 5/12 plastic laid 5/14 Dutch white clover seeded
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