2012 Pecan Disease Management Update Jason Brock Dept

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Presentation transcript:

2012 Pecan Disease Management Update Jason Brock Dept 2012 Pecan Disease Management Update Jason Brock Dept. of Plant Pathology, UGA-Tifton

Anthracnose Symptoms 2009 2010

Rainfall, Ponder Farm, 2011

Disease Cycle Inoculation Infection Symptom Development Survival Latent Infection “The state in which a host is infected with a pathogen but does not show any symptoms” Chain of events for every disease. Not life cycle, but does correspond. Wanted to cover here instead of at beginning Chain of events in the development, expression, and continuation of a plant disease Inoculation: viable propugule in contact with infection court of plant Penetration: direct, natural openings, wounds Infection: establishes a feeding relationship. Even most resistant plants are penetrated. When symptom expression might begin. Invasion: spreads out Reproduction: will cover a later. Dissemination: air, water, vectors, humans Survival: perennials, debris, insect vectors, seeds, in soil (resting)

Latent infections Freeze, bleach, and ethanol dip Pathogen grows saprophytically

Leaf Sampling, 2011 (No symptoms present at harvest)

Rainfall, Ponder Farm, 2011

Will anthracnose continue to be a problem? What influences symptom development? Non-chemical control? Fungicides? Selection Timing

Recommendations for Control of Anthracnose Tree Health Promote good air movement protectant fungicide program Strobilurins (Group 11) Topsin Phosphorous Acid Fungicides

Topsin Abound, Headline, Sovran Absolute, Stratego, Quadris Top, Quilt Trade Names Agri-fos Fosphite Fungi-Phite K-Phite Phostrol Rampart Topaz

Scab?

A Great Year for a Spray Advisory (AWIS.com)? 2011 2102 ?

Fungicide Application Strategies The Use of Reduced-Rate Fungicide Tax Mixes

Fungicide Application Strategies Spiking Tank Mixes

2004 Wichita Fungicide Trial Treatment Rate/A INC SEV Nontreated ---- 100 98 a Enable 2F + Elast 400F 4.0 fl oz 25.0 fl oz 46 b 6.0 fl oz 36 b 37.5 fl oz 22 c 19 c

2006 Wichita Fungicide Trial Treatment (App’s 1 – 10) Rate/A (oz.) NIN Nontreated ---- 100 a Enable 2F + Elast 400F 4.0 25.0 35.9 b 8.0 23.7 b 50.0 2.1 c Super Tin 80WP 3.75 19.7 c 7.5 4.7 d 0.8 d

Fungicide Application Strategies Tank Mixing vs. Alternating

2006 Wichita Fungicide Trial Treatment App’s Rate/A (oz.) NIN Nontreated ---- 100 a Enable 2F + Elast 400F 1 – 10 4.0 25.0 35.9 b Elast 400F 1,3,5,7,9 2,4,6,8,10 8.0 50.0 24.2 b Super Tin 80WP + Elast 400F 3.75 19.7 c 7.5 11.5 c

2010 Desirable Fungicide Trial Treatment App’s Rate/A (oz.) LIN LSEV NIN NSEV Nontreated ---- 63.5 a 12.0 a 95.7 a 54.0 a Enable 2F + Elast 400F 1 – 10 4.0 25.0 46.8 b 6.8 b 93.3 a 14.2 b Elast 400F 1,3,5,7,9 2,4,6,8,10 8.0 50.0 45.5 b 6.7 b 96.7 a 10.9 bc Super Tin 80WP + Elast 400F 3.75 33.1 c 5.5 c 60.0 c 4.5 c 7.5 27.3 c 4.2 c 31.3 d 8.8 bc

Common Name Trade FRAC Code 1 M3 30 Fungicide Class Common Name Trade FRAC Code QoIs (strobilurins) azoxystrobin Abound ½ of Quilt ½ of Quadris Top 11 kresoxim-methyl Sovran pyraclostrobin Headline trifloxystrobin ½ of Absolute DMIs (triazoles, sterol inhibitors) propiconazole Bumper, Orbit Propimax 3 tebuconazole Monsoon, Orius, Tebuzol, Toledo metaconazole Quash fenbuconazole Enable difenoconazole ½ of Quadris Top Common Name Trade FRAC Code thiophanate- methyl Topsin-M 1 dodine Elast M3 fentin hydroxide (=TPTH) Super Tin, Agri Tin 30