Epidemiology and Management of Hop Pests and Diseases

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Powdery Mildew Risk Index1. If greater than 6 continuous hours above 86°F,subtract 20 points, else;2. If greater 0.1” rain, subtract 10 points,else;3. If greater than 6 continuous hours above 86°Con previous day, then no change in the index,else;4. If at least six continuous hours between 60-81°F, then add 20 points, else;5. If none <strong>of</strong> the above rules apply, then subtract10 points.
Powdery Mildew Colonies are Tolerant1to Leaf WetnessDisease severity0.80.60.40.2004Wetness duration (hr)8126241261224Hours afterinfection
Page 1 and 2: Epidemiology andManagement of Hop P
Page 3 and 4: Compendium of HopDiseases, Arthropo
Page 5 and 6: Overall Project Objective• Integr
Page 7 and 8: • Johnson (1991) GDD predictsemer
Page 9 and 10: 160Accumulated GDD, 2006140120GDD (
Page 11 and 12: Downy Mildew Severity AmongBasal sp
Page 13: hopcucurbitPCR Detection of Downy M
Page 16 and 17: Multi-Gene Phylogeny• Several sin
Page 18 and 19: Type I versus Type II Error?
Page 20 and 21: Air sampling by Burkhard and Rotoro
Page 22 and 23: Pseudoperonospora humuli Sporangial
Page 24 and 25: Basal spikes per hillABasal spikes
Page 26 and 27: Fungicide Effects on Arthropods
Page 28 and 29: Spider mite populations in the uppe
Page 30 and 31: SulfurWater1234
Page 32 and 33: Mite-Fungicide Interactions• Ques
Page 34 and 35: 1210ANon-TreatedMites per leaf864Sy
Page 36 and 37: Coccinelidae per leaf/shake sample1
Page 38 and 39: Hop Aphid Populations inRelation to
Page 40 and 41: Thanks to collaboratorsand cooperat
Page 42 and 43: 1009080702007 WeatherRain Temp RH S
Page 44 and 45: Cone Browning Associated withDiffus
Page 48 and 49: 1009080702007 WeatherRain Temp RH S
Page 50 and 51: Alternaria alternataFrom Rotem (199
Page 52 and 53: Alternaria Cone Disorder• Associa
Page 54 and 55: Alternaria Cone Disorder2007 Isolat
Page 56 and 57: Powdery Mildew (and Alternaria)Cone
Page 58 and 59: Rate of Mite Increase andCone Damag
Page 60: Red Crown Rot SymptomsCourtesy Tris
Page 69: Red Crown Rot• Phacidiopycnis sp.
Page 72 and 73: Spatial Patterns of Affected Plants
Page 74: Red Crown Rot• Research in Progre

Epidemiology and Management of Hop Pests and Diseases

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