IR-4 Ornamentals Phytophthora and Pythium Trials. Dr. Mary Hausbeck Professor and Extension Specialist Michigan State University

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1 IR- Ornmentls Phytophthor nd Pythium Trils Dr. Mry Husbeck Professor nd Extension Specilist Michign Stte University

2 Phytophthor cryptoge on Gerber D.M. Benson, NCSU Aliette Alude Biophos Disrm Fenstop Fluopicolide Heritge Insigni Mgelln Products tested Mndipropmid Medllion MultiGrd Muscodor lbus Remedier Segwy Subdue MAXX Vitl

3 Phytophthor cryptoge on Gerber D.M. Benson, NCSU Gerber Yellow Revolution trnsplnted 9 Mr. ½ tsp/pot Osmocote on My, drip irrigted, fertilized weekly with ppm Peter s --. P. cryptoge grown on rice grins - Apr, one infested grin incorported into growing medium Apr. 8 reps in RCBD.

4 Phytophthor cryptoge on Gerber D.M. Benson, NCSU Muscodor lbus incorported Apr. All fungicide sprys pplied 9 Apr, My. All es pplied Apr, My except: Remedier ed 9 Apr, My. Folir rtings on,9, My. Height (cm), top weight (g), root rot on My.

5 Folir rting (=helthy, =crown rot/ded) Root rot (=helthy, 5=crown rot/ded) Height (cm) bcd Height e Untreted Phytophthor cryptoge on Gerber ( of ) h h h gh Root rot Fenstop fl oz Fluopicolide 6 ml Segwy 6 fl oz Fluopicolide ml fgh Subdue Mxx fl oz efgh e e e e b d b b c c Mndipropmid 8 fl oz Folir rting def b de Alude.7 fl oz spry cdef bc cde Heritge.9 oz

6 Folir rting (=helthy, =crown rot/ded) Root rot (=helthy, 5=crown rot/ded) Height (cm) bcd Height Untreted Phytophthor cryptoge on Gerber ( of ) Folir rting bcd Insigni 8 oz bcd Aliette 5 lb spry bc Root rot b b e bcde cd Segwy fl oz bcde de Vitl 6 fl oz spry bcd de Disrm oz bcd e Mgelln fl oz spry de Medllion oz bc e e e Biophos 6 fl oz spry

7 Folir rting (=helthy, =crown rot/ded) Root rot (=helthy, 5=crown rot/ded) Height (cm) bcd Height Phytophthor cryptoge on Gerber ( of ) Untreted Heritge.8 oz b b b e e e e e Remedier oz Muscodor lbus Multi- Grd Uninfested check 7.5 g/l incorp., ppm Segwy 6 fl oz check Folir rting h h h h Heritge.8 oz check Root rot e e e e Fluopicolide 6 ml check

8 Phytophthor citricol on Rhododendron R. Regn, Oregon Stte University Products tested Aliette Heritge Mgelln NOA 65 Stture DM Subdue MAXX Tnos V-6 FL Segwy

9 Phytophthor citricol on Rhododendron R. Regn, Oregon Stte University Rhododendron Nov Zembl Tretments pplied s es or sprys. Men disese lef re determined on Jul (6 dys fter inocultion).

10 Men Disese Lef Lesion Are (mm ) Percent control Phytophthor citricol on Rhododendron ( of ) b Lesion Are f f e de de cde cde cde Percent Control Untreted Mgelln fl oz Aliette.8 oz Segwy 6 oz Heritge oz spry NOA 65 8 oz Stture DM.8 oz Subdue Mxx oz spry V-6 FL ml

11 Men Disese Lef Lesion Are (mm ) Percent control Phytophthor citricol on Rhododendron ( of ) b Lesion Are bcde bcde bcde bcd bc bc Percent Control Untreted Heritge oz/ Subdue oz spry NOA 65 oz V-6 FL 6 ml Heritge oz spry Subdue Mxx oz spry Segwy oz Tnos oz spry

12 Pythium irregulre on Gernium A. Chse, Chse Reserch Grdens Products tested Heritge Hymexzol NOA 65 Subdue MAXX Terrzole 5WP V-6

13 Pythium irregulre on Gernium A. Chse, Chse Reserch Grdens Gernium Pinto White trnsplnted Jun. ½ tsp/pot Osmocote on Jun. Slurry of 5-dy old P. irregulre ed 5 Jun. All tretments ed,,7 Jun nd,,8 Jul.

14 Pythium irregulre on Gernium A. Chse, Chse Reserch Grdens Top grde recorded on 6,6 Jul. Height recorded on,6 Jul. Number of ded leves on 6 Jul. % good roots on 5 Jul. Top weight on 6 Jul.

15 Pythium irregulre on Gernium ( of ) Good roots (%) 6 e de de Good roots de de de cde Ded leves Ded leves Height (cm) bc Wter Noninoculted Height Wter inoculted bc Heritge.8 oz c Heritge.9 oz Subdue MAXX oz bc bc bc Terrzole 5WP 8 oz Heritge.9 oz + Subdue MAXX oz bc V-6 ml

16 Good roots (%) 6 e Pythium irregulre on Gernium ( of ) Good roots bcd bcd bc bc b Ded leves Height (cm) Ded leves bc Wter Noninoculted Wter inoculted bc Hymexzol 6 oz bc NOA 65 8 oz dys b bc Hymexzol oz b b NOA 65 oz 7 dys b Height V-6 6 ml

17 Phytophthor cinnmomi on Mexicn Cliffrose, H. Krtsch Products tested Aliette Alude Biophos Cyzofmid Fenmidone Heritge Insigni Mgelln MultiGrd Muscodor lbus NOA 65 Stture DM Terrzole TM-7 V-6 FL Vitl

18 Phytophthor cinnmomi on Mexicn Cliffrose, H. Krtsch Two experiments combined (tretment differences between experiments not significnt), reps/experiment = reps totl. Mexicn cliffrose (Purshi mexicn) seeded on 6 Aug/ Jn. Osmocote Plus g/plnt on 9 Nov/ My. Seedlings trnsplnted nd Muscodor lbus incorported 6 Dec/ My. All tretments ed Dec/ My. P. cinnmoni 5 ml slurry ( pltes/l) pplied by pipette on 6 Dec/ My.

19 Phytophthor cinnmomi on Mexicn Cliffrose, H. Krtsch Exp : disese severity/incidence, phytotoxicity recorded on 6, Dec,,7, Jn. Plnt height, width recorded on 6 Dec, Jn. Exp : disese severity/incidence, phytotoxicity recorded on My, 7, Jun, 5,9 Jul. Plnt height, width recorded on My, 9 Jul. MultiGrd ws phytotoxic (8., = ded) regrdless of ppliction rte.

20 Folir rting 56 di (=no disese, 5=ded) Length chnge over 56 dys (cm) Phytophthor cinnmomi on Mexicn Cliffrose ( of ) 5 - Length chnge Disese rting Width chnge over 56 dys (cm) - - Width chnge Untreted uninoculted Untreted inoculted Cyzofmid oz Vitl pt Aliette 6. oz TM-7 8SC oz Biophos 6 fl oz Mgelln 6 fl oz Insigni 8 oz

21 Folir rting 56 di (=no disese, 5=ded) Length chnge over 56 dys (cm) 5 - Phytophthor cinnmomi on Mexicn Cliffrose ( of ) Disese rting Length chnge Width chnge over 56 dys (cm) - - Width chnge Untreted uninoculted Terrzole 8 oz Untreted inoculted Fenmidone 7 oz Alude.7 fl oz Stture DM.8 oz Heritge oz V-6 FL 6 ml Fenmidone oz

22 Folir rting 56 di (=no disese, 5=ded) Length chnge over 56 dys (cm) 5 - Phytophthor cinnmomi on Mexicn Cliffrose ( of ) Disese rting Length chnge Width chnge over 56 dys (cm) - - Width chnge Untreted uninoculted NOA 65 oz Muscodor lbus 7.5 g/l incorp. Untreted inoculted Cyzofmid 6 oz NOA 65 8 oz V-6 FL ml Multi- Gurd 5 ppm Multi- Gurd ppm

23 Phytophthor cinnmomi on Azle A. Pennucci, NE T&O Reserch Products tested Aliette Alude Biophos Cyzofmid Fluzinm Insigni Mgelln Stture Subdue Trubn

24 Phytophthor cinnmomi on Azle A. Pennucci, NE T&O Reserch replicte experiments. Inoculted by inserting -inch infected stem piece into the root bll t: Time of tretment One week fter tretment Time of tretment (root blls sliceinjured 5 dys prior to tretment) One week fter tretment (root blls slice-injured 5 dys prior to tretment)

25 Phytophthor cinnmomi on Azle A. Pennucci, NE T&O Reserch Disese rted s: Number wilted leves/6-plnt liner flt Number ded plnts the following spring Results: Disese development ws only mrginlly sufficient Slicing injury llowed gret disese

26 Wilted leves (6 wks fter tretment) Ded plnts (9 mos fter tretment) Phytophthor cinnmomi on Azle ( of ) Control Alude.7 Biophos. Inoculted t tretment Inoculted t tretment No injury Root bll slice-injured Mgelln 6 Cyzofmid.5 Cyzofmid

27 Wilted leves (6 wks fter tretment) Ded plnts (9 mos fter tretment) Phytophthor cinnmomi on Azle ( of ) Control Alude.7 Biophos. Inoculted week lter Inoculted week lter No injury Root bll injured Mgelln 6 Cyzofmid.5 Cyzofmid

28 Wilted leves (6 wks fter tretment) 8 6 Phytophthor cinnmomi on Azle ( of ) Inoculted t tretment No injury Root bll injured Ded plnts (9 mos fter tretment) 6 Control Insigni 6 Insigni 6 Stture. Stture 6. Fluzinm Aliette 6. Inoculted t tretment Subdue Trubn. Cyzofmid.5 + Alude.7 Cyzofmid.5 + Aliette.

29 Wilted leves (6 wks fter tretment) Ded plnts (9 mos fter tretment) Control Insigni 6 Phytophthor cinnmomi on Azle ( of ) Insigni 6 Stture. Stture 6. Fluzinm Aliette 6. Inoculted week lter Subdue Trubn. No injury Root bll injured Inoculted week lter Cyzofmid.5 + Alude.7 Cyzofmid.5 + Aliette.

30 Phytophthor drechsleri on Poinsetti M.K. Husbeck, MSU Products tested Alude Cyzofmid FenStop Heritge Insigni Stture Subdue MAXX Terrzole V-6 FL ZeroTol

31 Phytophthor drechsleri on Poinsetti M.K. Husbeck, MSU Freedom Red cuttings in osis cubes trnsplnted on 9 Jun, inoculted with two.-cm gr plugs of P. drechsleri plced on osis. 6 one-plnt replictes in CRD. ppm Peter s -- twice weekly. Tretments ed 9 Jun (fter trnsplnt),,5 Jul. Plnt helth, deth rted on 9 Jun, 8 Jul, Aug.

32 Plnt helth (=helthy, 5=ded) 5 8 Phytophthor drechsleri on Poinsetti ( of ) Plnt helth Deth c b Deth (%) 6 bc V-6 FL fl oz V-6 FL fl oz Subdue MAXX EC fl oz Untreted uninoculted Cyzofmid SC fl oz Terrzole 5WP 8 oz Stture DM 5WP 6. oz b Untreted inoculted Cyzofmid SC 6 fl oz

33 Plnt helth (=helthy, 5=ded) 5 8 Phytophthor drechsleri on Poinsetti ( of ) Plnt helth c bc b b Deth c c c c c Deth (%) 6 Untreted uninoculted bc Untreted inoculted b FenStop SC 7 fl oz b Alude.7 fl oz bc Heritge 5WG.8 oz bc Insigni WG 8 oz Heritge 5WG.9 oz ZeroTol 7% 5 fl oz

34 Pythium phnidermtum on Snpdrgon, M.K. Husbeck, MSU Products tested Heritge 5WG Hymexzol NOA 65 5SC Subdue MAXX EC Terrzole 5WP V-6 SC

35 Pythium phnidermtum on Snpdrgon, M.K. Husbeck, MSU Montego Mix seedlings trnsplnted on Apr into medi with 8 oz infested millet/ ft. 6 one-plnt replictes in CRD. ppm Peter s -- twice weekly. Tretments ed Apr (fter trnsplnt), My. Plnt helth, height rted on My, 6 Jun.

36 Plnt helth (=helthy, =ded) Height (cm) Pythium phnidermtum on Snpdrgon ( of ) Untreted uninoculted c cde Untreted inoculted b Terrzole 5WP 8 oz b Subdue MAXX EC fl oz b c Heritge 5WG.8 oz b cd V-6 SC fl oz Helth bc Height de NOA 65 5SC 8 fl oz

37 Plnt helth (=helthy, =ded) Height (cm) Pythium phnidermtum on Snpdrgon ( of ) Helth Untreted uninoculted c Untreted inoculted bc Heritge 5WG.9 oz bc NOA 65 5SC fl oz c Hymexzol 6 fl oz c V-6 SC fl oz c Height cde cde cde e e e Hymexzol fl oz

38 Phytophthor nicotine on Snpdrgon, M.K. Husbeck, MSU Products tested Cyzofmid SC Fenmidone 5SC MultiGrd NOA 65 Stture DM 5WP Trubn WP V-6 FL V-6 5.7FL

39 Phytophthor nicotine on Snpdrgon, M.K. Husbeck, MSU Montego Mix seedlings trnsplnted in Apr. ppm Peter s -- times weekly. one-plnt replictes in CRD. ml zoospore solution pipetted into soil t bse of plnts on My. Tretments ed t -dy intervls on 8 My, Jun (MultiGrd t 7-dy). Plnt helth, deth rted on 5 My,,8,5 Jun.

40 Helth (=helthy, 5=ded) 5 8 Phytophthor nicotine on Snpdrgon ( of ) c c Helth Deth Deth (%) 6 Untreted inoculted Untreted uninoculted Fenmidone 5SC 7 fl oz NOA fl oz V-6 FL. fl oz V-6 FL fl oz V-6 5.7FL 6 fl oz V-6 FL. fl oz Fenmidone 5SC fl oz

41 Helth (=helthy, 5=ded) 5 8 Phytophthor nicotine on Snpdrgon ( of ) c c Helth Deth c c c b b c c c Deth (%) 6 Untreted inoculted NOA 65. fl oz b Stture DM 5WP 6. oz b Cyzofmid SC 6 fl oz b Untreted uninoculted Cyzofmid SC fl oz Multi- Grd 5 ppm (7-dy) Multi- Grd ppm (7-dy) Trubn WP 6 oz

42 Phytophthor nicotine on Snpdrgon, M.K. Husbeck, MSU Products tested Insigni WG Stture DM 5WP Terrzole 5WP Trubn WP Subdue MAXX.EC

43 Phytophthor nicotine on Snpdrgon, M.K. Husbeck, MSU Rocket Red fertilized with ppm Peter s -- times weekly. 6 one-plnt replictes in CRD. ml zoospore solution pipetted into soil t bse of plnts on 5 Aug. Tretments ed t 7-dy intervls on 5,,9 Aug (Stture t -dy). Plnt helth, deth rted on,9 Aug nd 5 Sep.

44 Helth (=helthy, 5=ded) 5 Phytophthor nicotine on Snpdrgon c Untreted b Subdue Mxx.EC fl oz Stture DM 5WP.8 oz (-dy) Terrzole 5WP 6 oz Insigni WG oz Helth b Trubn WP 6 oz

45 Folir Phytophthor nicotine on Vinc, M.K. Husbeck, MSU Products tested Aliette WDG Heritge 5WG Hurricne 8WP Stture DM 5WP Subdue MAXX MEC

46 Folir Phytophthor nicotine on Vinc, M.K. Husbeck, MSU Cooler Pink fertilized with 5 ppm Peter s -- times weekly. one-plnt replictes in CRD. Zoospore solution spryed onto plnts dy fter initil tretment. Tretments spryed t 7-dy intervls on (Hurricne pplied s ). Numbers of lesions, infected leves nd disese severity rted on 9 Oct.

47 Disese severity (=helthy, =ded) Infected leves (ve.) Lesions (ve.) Folir Phytophthor nicotine on Vinc ( of ) b d c Untreted Heritge oz + Subdue Mxx.5 oz b Aliette WDG.5 lb b Heritge oz + Subdue Mxx oz Disese severity Heritge 5WG oz Infected leves b b b Lesions Heritge 5WG oz Hurricne 8WP.5 oz

48 Disese severity (=helthy, =ded) Infected leves (ve.) Lesions (ve.) Folir Phytophthor nicotine on Vinc ( of ) b d c b bc b b b b bc b Disese severity b bc b b Infected leves bc b b c Lesions bc Untreted Heritge 5WG oz ( dy) Stture DM 5WP.8 oz Subdue Mxx MEC oz Heritge 5WG oz ( dy) Heritge oz + Subdue Mxx oz ( dy) Hurricne 8WP.5 oz ()

49 Closing comments Questions?

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