Turf Insect Management. Diane Alston Utah State University Utah Pest Control & Lawn Care Assoc. Annual Convention February 10, 2006
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1 Turf Insect Management Diane Alston Utah State University Utah Pest Control & Lawn Care Assoc. Annual Convention February 10, 2006
2 Pest Management Resources on the Web Pest fact sheets & photos Pest management recommendations Answers to frequently asked pest questions Pesticide information Utah Plant Pest Diagnostic Lab (submit pest samples for id) Outreach education slideshows
3 Pest Management Resources on the Web Insects and Plant Diseases One-stop shopping for Utah pest management information
4 Pest Management Resources on the Web USU Extension Publications USU Cooperative Extension Publications Home Gardening Agriculture Natural Resources
5 Search for Information on the Web Google Search Engine information images
6 Integrated Pest Management IPM Plan ahead (use preventive strategies where possible) Accurate identification of problem Monitor regularly Treat only if needed (thresholds) Time treatments for weak links in pest life cycle Use multiple pest management tools Cultural Mechanical Biological Chemical Keep records Environmentally, economically, and socially sound
7 Problem Diagnosis! Most plant health problems are not caused by biotic factors (pests: insects, diseases), but by abiotic factors (irrigation, environment, culture & care) Lawn with dry area suggestive of sprinkler pattern problem
8 Identification of Insect Problems Look for presence of insect: Fat caterpillars Brown moths Small, legless grubs Large C-shaped grubs Look for type of injury: Chewed leaves Short stems Stems break easily Sawdust like frass Spongy turf Turf roll-back Predator digging
9 Time Treatments for Weak Links in Insect Life White Grubs May & June Beetles Cycle Spring Summer Fall/Winter Lay eggs late spring to summer small larvae present in early summer Pupate 3 to 12 deep
10 Turf Cultural Care Good lawn care (fertilize, mow, aerate, irrigation) Amend soil (add OM) Select more tolerant turf species & varieties De-thatch
11 Major Turf Pests Surface / Thatch Feeders (leaf, stem): Armyworm Cutworm Sod webworm Mites Surface / Crown Feeders (burrow into stem, crown): Billbug Subterranean webworm Subsurface (root): May & June beetles
12 White Grubs May and June Beetles (Phyllophaga) Black Turfgrass Ataenius (Ataenius) Scarab beetle family C-shaped white larvae Brown head, legs Eat roots Turf roll-back 1-3 year life cycle
13 White Grubs Damage: Root feeding, plants wilt, yellow, thin Irregular dead patches Turf not anchored to soil, turf roll-back Invasion by broadleaf weeds Secondary damage from small mammals & birds Most feeding injury in spring to early summer and late summer to fall
14 White Grubs 1-3 year life cycle Spring Summer Fall/Winter Pupate Can spend 1-2 years as 2 nd to 3 rd instar larva 2 nd -3rd instars move 3 to 12 deep for winter
15 White Grub Control Target small larvae (late spring-early summer) Target larvae before they dig deep for the winter (late summer to early fall) Threshold: 3-4 grubs/sq ft Irrigate to move materials to grubs in the upper root zone Imidacloprid (Merit TM ) Halofenozide (Mach 2 TM ) Carbaryl (Sevin TM ) Chlorpyrifos (Dursban Pro TM ) Diazinon Trichlorfon (Dylox TM ) Beneficial Nematodes -Heterorhabditis bacteriophora (Cruiser TM ), Steinernema carpocapsae (Scanmask TM ) Fungus Beauveria bassiana (Botanigard TM, Naturalis TM )
16 Billbugs (Sphenophorus spp.) Bluegrass & Denver Billbugs Weevil beetle family (snout) Burrow in stems, crown Small, legless larvae Blades break at crown Sawdust like frass 1 year life cycle
17 Billbugs Life Cycle Adults & larvae overwinter in turf Begin feeding in spring Eggs laid in stems (spring to summer) New adults in summer Damage Larvae feed within stems, crowns Abundant frass Stems break easily at crown Dollar spots grow into larger patches
18 Billbug Control Target small larvae (spring and early summer) Threshold: 20 larvae/sq ft Light irrigation to move materials into crown zone Resistant turfgrass varieties Imidacloprid (Merit TM ) Halofenozide (Mach 2 TM ) Scimitar TM, Talstar TM & Tempo TM for adults Chlorpyrifos (Dursban Pro TM ) Carbaryl (Sevin TM ) Beneficial Nematodes -Heterorhabditis bacteriophora (Cruiser TM ) & Steinernema carpocapsae (Scanmask TM ) Fungus Beauveria bassiana (Botanigard TM, Naturalis TM )
19 Sod Webworms Lepidoptera (moth, caterpillar) Snout moths Gray to brown caterpillars Larvae feed on grass blades Larvae form silken tunnels in thatch Injury not as severe as grubs & billbugs Gray to brown moths fly just above turf in zigzag pattern; especially near dusk 1-3 generations per year
20 Sod Webworms Damage Larvae chew on leaves & stems at night or on cloudy days Cut off grass blades, drag into tunnels Small, irregular brown patches of closely cropped grass Green frass accumulates at crowns Secondary damage from birds pecking holes in turf Larvae overwinter in silken tunnels
21 Sod Webworm Control Target young larvae (late spring to summer) Threshold: 15 larvae/sq ft Increase mowing height Bacillus thuringiensis (Bt) must be ingested by small larvae Spinosad (Conserve TM ) Azadirachtin (Ornazin TM ) Imidacloprid (Merit TM ) Halofenozide (Mach 2 TM ) Scimitar TM, Talstar TM, Tempo TM ) Acephate (Orthene TM ) Carbaryl (Sevin TM ) Diazinon Chlorpyrifos (Dursban Pro TM ) Beneficial Nematodes
22 Cutworms & Armyworms Lepidoptera (Noctuid moths) Management is very similar to sod webworms Target young larvae Threshold: 5 larvae/sq yd
23 Mites Banks Grass Mite Clover Mite Twospotted Spider Mite Feed on leaves Remove sap, chlorophyll Cause speckling, silvering, bronzing Dry conditions, drought stress Spring to summer
24 Mite Control Soap (1-2%) Stiff stream of water; irrigate Dicofol (Kelthane TM ) Bifenthrin (Talstar TM ) Sulfur Predaceous mites
25 USU Extension Pest Management Slideshows Where can you view this slideshow? One-stop shopping for Utah pest management information
26 Contact Information Diane Alston Entomologist Utah State University (435) ipm
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