Presentation is loading. Please wait.

Presentation is loading. Please wait.

Peach Rusty Spot Management N. Lalancette, Ph.D. Assoc. Prof. & Specialist in Tree Fruit Pathology Rutgers Agricultural Research & Extension Center Bridgeton,

Similar presentations


Presentation on theme: "Peach Rusty Spot Management N. Lalancette, Ph.D. Assoc. Prof. & Specialist in Tree Fruit Pathology Rutgers Agricultural Research & Extension Center Bridgeton,"— Presentation transcript:

1 Peach Rusty Spot Management N. Lalancette, Ph.D. Assoc. Prof. & Specialist in Tree Fruit Pathology Rutgers Agricultural Research & Extension Center Bridgeton, New Jersey

2 Topics  Importance  Causal Agent  Symptoms & Identification  Epidemiology  Management  Cultural Control  Chemical Control  Biorational Control  Cultivar Resistance  Summary

3 Importance  First observed in Idaho ‘Elberta’ peach orchard (Blodgett, 1941) orchard (Blodgett, 1941)  Occurs in peach growing regions of the United States and Europe the United States and Europe  Fruit infection approaches 100% on highly susceptible cultivars if left unprotected susceptible cultivars if left unprotected  Yield loss ranging from $11/A in 1996 to $204/A in 1997 ( NJ IPM survey) $204/A in 1997 ( NJ IPM survey)

4 Causal Agent  “Apple mildew on peach” (Manji, 1972, CA) - rusty spot like symptoms - rusty spot like symptoms  Disease gradient in peach orchard down- wind of apple block (Ries & Royce, 1978, IL) wind of apple block (Ries & Royce, 1978, IL)  Molecular identification of Podosphaera leucotricha (Jankovics et. al., 2011, Hungary) leucotricha (Jankovics et. al., 2011, Hungary)  Other agents?

5

6  Rusty spot symptoms occur only on fruit  Symptoms 1st appear 2-3 weeks after shuck split  Spots mostly circular, sometimes initially white  Lesions turn rust-colored, from center outward Symptoms

7  Lesions expand and can coalesce  Epidermis and trichomes become necrotic (die)  Lesion surface russetted, smooth (no trichomes)  Cracking can occur during pre-harvest swell Symptoms

8

9 TemporalAnalysis Epidemiology Control recommendations as recent as 1995:  Apply sprays “at shuck split and continue on an eight- to 10-day schedule”  Can result in as many as 6 to 8 sprays

10 Temporal Analysis of Rusty Spot Epidemics 1999 & 2000 Experimental Test Site  Jerseyqueen orchard w. history of rusty spot  No fungicide sprays applied all season Disease Assessments  Examined fruit from shuck-off to harvest  Disease incidence: proportion infected fruit Epidemiology

11 Peach Rusty Spot Disease Progression 2000 Jerseyqueen Orchard Epidemiology 10May 19June

12 Peach Rusty Spot Disease Progression 2000 Jerseyqueen Orchard Epidemiology

13 Peach Rusty Spot Disease Progression 2000 Jerseyqueen Orchard Epidemiology 10May 18Aug

14 Peach Rusty Spot Disease Progression Epidemic Phases GrowthStaticDecline JQ ’99 JQ ’00 Epidemiology

15  Application Timing?  Effective Fungicides? Chemical Control

16 Fungicide Application Timing Study Materials and Methods Statistical Design  RCBD with five replicates in Jerseyqueen orchard  Single-tree plots surrounded non-sprayed buffers Fungicide Treatments  Myclobutanil (Nova 40W @ 5 oz/A in 100 gpa)  0-8 applications starting at petal fall (PF,SS,1C-6C) Chemical Control

17 Fungicide Timing # None 0 Peach Rusty Spot Disease Progress Jerseyqueen - 1999 Chemical Control

18 Fungicide Timing # None 0 PF 1 { "@context": "http://schema.org", "@type": "ImageObject", "contentUrl": "http://images.slideplayer.com/12/3578671/slides/slide_18.jpg", "name": "Fungicide Timing # None 0 PF 1

19 Fungicide Timing # None 0 PF 1 PF, SS 2 { "@context": "http://schema.org", "@type": "ImageObject", "contentUrl": "http://images.slideplayer.com/12/3578671/slides/slide_19.jpg", "name": "Fungicide Timing # None 0 PF 1 PF, SS 2

20 { "@context": "http://schema.org", "@type": "ImageObject", "contentUrl": "http://images.slideplayer.com/12/3578671/slides/slide_20.jpg", "name": "

21 { "@context": "http://schema.org", "@type": "ImageObject", "contentUrl": "http://images.slideplayer.com/12/3578671/slides/slide_21.jpg", "name": "

22 Fungicide Timing # None 0 PF 1 PF, SS 2 PF-1C 3 PF-2C 4 PF-6C 5-8 { "@context": "http://schema.org", "@type": "ImageObject", "contentUrl": "http://images.slideplayer.com/12/3578671/slides/slide_22.jpg", "name": "Fungicide Timing # None 0 PF 1 PF, SS 2 PF-1C 3 PF-2C 4 PF-6C 5-8

23 Peach Rusty Spot Disease Progress Jerseyqueen - 2000 Fungicide Timing # None 0 PF 1 PF, SS 2 PF-1C 3 PF-2C 4 PF-6C 5-8 { "@context": "http://schema.org", "@type": "ImageObject", "contentUrl": "http://images.slideplayer.com/12/3578671/slides/slide_23.jpg", "name": "Peach Rusty Spot Disease Progress Jerseyqueen - 2000 Fungicide Timing # None 0 PF 1 PF, SS 2 PF-1C 3 PF-2C 4 PF-6C 5-8

24 { "@context": "http://schema.org", "@type": "ImageObject", "contentUrl": "http://images.slideplayer.com/12/3578671/slides/slide_24.jpg", "name": "

25 Peach Rusty Spot Area Under the Disease Progress Curve # Fung. App. 1999 AUDPC* 2000 AUDPC* 071.0 A67.0 A 161.3 B62.6 A 248.9 C48.6 B 330.2 D36.4 C 420.9 E19.5 D 524.5 DE16.8 D 622.6 DE16.1 D 721.3 DE19.6 D 821.9 DE--- * Waller-Duncan K-ratio T test;  =0.05, Kratio=100 Chemical Control

26  Application Timing?  Effective Fungicides? Chemical Control

27 Peach Rusty Spot Disease Management Validation Prunus persica ‘Autumnglo’ 2000 FungicideRate/APFSS1C2C Non-treated control --------------- Microthiol Special 80DF 12.0 lb  Nova 40W (Rally 40W) 5.0 oz  Chemical Control

28 Peach Rusty Spot Disease Management Validation Disease Incidence Chemical Control

29 Peach Rusty Spot Relative Fungicide Efficacy FungicideEfficacy Rally (formerly Nova)++++ Gem, Inspire Super, Quadris Top+++ Indar, Orius, Orbit, PropiMax, Quash Abound, Pristine, Merivon, Fontelis ++ Topsin M, Sulfur+ Bravo, Captan, Copper, Ziram--- ++++ = Excellent +++ = Good ++ = Fair + = Poor --- = Ineffective Chemical Control

30

31 Type Trade Name Active Ingredient Biological SerenadeBacillus subtilis AQ10Ampelomyces quisqualis ExperimentalPhoma glomerata Extracts ElexaChitosan ValeroCinnamic aldehyde TrilogyNeem oil extract MilsanaReynoutria sachalinensis Inorganic ArmicarbPotassium bicarbonate NutrolPotassium dihydrogen phosphate Biorationals Active on Powdery Mildews Biorational Control

32

33 Integrated Conventional / Biorational Programs IntegrationFungicidePeach Phenology Alternation Myclobutanil Biorational PF 1C SS 2C Block Myclobutanil Biorational PF, SS 1C, 2C Reverse Block Myclobutanil Biorational 1C, 2C PF, SS Mixture Myclobutanil + Biorational PF, SS, 1C, 2C NoneMyclobutanilPF, SS, 1C, 2C ----------Nonsprayed---------- Biorational Control

34 Integrated Rally / Serenade Rusty Spot Programs 2002 Biorational Control

35 Integrated Rally / Armicarb Rusty Spot Programs 2002

36 Rusty Spot Integrated Management AUDIC TreatmentIntegration20022004 Non- treated control 9.39 a 4.10 a Conventional – Rally standard 1.07 c 0.43 de SerenadeAlternation 1.79 c 1.02 cd Block 3.35 b 0.59 de Reverse Block 1.55 c 1.50 bc Mixture 1.41 c 0.80 de Armicarb or Kaligreen Alternation 1.43 c 1.57 bc Block 1.90 c 0.46 de Reverse Block 1.54 c 1.72 b Mixture 1.19 c 0.33 e

37

38 Peach Cultivar Block at RAREC  Block composition  Advanced selections from Rutgers breeding program (J. Goffreda)  Commercially available cultivars  Planting design  Early season  Early mid-season  Late mid-season  Late season Cultivar Resistance

39 Cultivar Suceptibility  Final Disease Incidence Assessment  Average of 2007 & 2008 Cultivar Resistance

40 Susceptibility Disease Incidence Very Low≤ 10% Susceptibility Classification RankVery Low Susc. 1Gloria 2Sugar May 3Harrow Beauty 4H11-59 5Saturn 67-28 7Sugar Lady 8L12-4 9NJF16 10White Lady 11H4-44 ---Blake (2007) Cultivar Resistance

41 Susceptibility Disease Incidence Very Low≤ 10% Low11-20% Susceptibility Classification RankLow Susc. 12J19-28 13Snow Giant 14H11-76 15H13-116 16D88-59 17H11-79 18L13-18 19Redhaven Cultivar Resistance

42 Susceptibility Disease Incidence Very Low≤ 10% Low11-20% Moderate21-40% Susceptibility Classification RankModerate Susc. 20Encore 21Messina 22Melik Early Topaz 23Desiree 24Sentry 25John Boy 26Raritan Rose 27Victoria 28Suncrest 29Jerseyglo 30Laurol ---Loring (2007) Cultivar Resistance

43 Susceptibility Disease Incidence Very Low≤ 10% Low11-20% Moderate21-40% High41-60% Susceptibility Classification RankHigh Susc. 31Bounty Cultivar Resistance

44 Susceptibility Disease Incidence Very Low≤ 10% Low11-20% Moderate21-40% High41-60% Very High≥61% Susceptibility Classification RankVery High Susc. 32Jerseyqueen 33Autumnglo Cultivar Resistance

45 Rusty Spot Management  Cultural Control  Planting - locate peach orchards away from powdery mildew susceptible apples  Pruning – open canopy for better air circulation (low RH) spray coverage  Fungicidal Control  Applications - four sprays typically required  Timing - PF, SS, 1C, 2C  Disease-favorable years (e.g., 2012) - add a 3 rd cover spray Summary

46 Summary Cultivar Susceptibility FungicideRate/A Application Timing High-Very HighRally 40WSP5-6 ozPF, SS, 1C, 2C ModerateGem 500SC Rally 40WSP 3.8 oz 4-5 oz PF SS, 1C, 2C Moderate (Biorational) Rally 40WSP * Armicarb 100* 4-5 oz 4-5 lb PF 1C SS 2C LowRally 40WSP2.5 ozPF, SS, 1C, 2C LowSulfur, actual10-12 lbPF, SS, 1C, 2C Very Lownone--- * * Or use Serenade MAX at 2-3 lb/A Rusty Spot Management Programs

47


Download ppt "Peach Rusty Spot Management N. Lalancette, Ph.D. Assoc. Prof. & Specialist in Tree Fruit Pathology Rutgers Agricultural Research & Extension Center Bridgeton,"

Similar presentations


Ads by Google