MICHIGAN STATE UNIVERSITY TURFGRASS DISEASE MANAGEMENT REPORT FOR 1982

Transcription

1 MICHIGN STTE UNIVERSITY TURFGRSS DISESE MNGEMENT REPORT FOR 98 J. M. Vrgs, Jr., R. Detweiler, nd V. Sheridn Deprtment f Btny nd Plnt Pthlgy Michign Stte University Snw Mld Fungicide Trils The 98-8 snw mld fungicide trils were cnducted t the Byne Highlnds Resrt n Penncrss creeping bentgrss mwed t /". Tretments were pplied t 6' x 9' plts in three replictins f rndm blck design n Octber 0, 98. The wettble pwders nd flwbles were pplied with smll-plt C0 spryer t vlume f gl/cre. The grnulr pplictins were pre-weighed nd pplied by hnd. The plt rtings were mde n pril 9, 98. (Tbles, nd ) Helminthsprium (Melting-Out) Fungicide Studies - 98 The 98 Helminthsprium melting-ut (Helminthsprium vgns) fungicide study ws cnducted t the Hncck Turfgrss Reserch Center n the Michign Stte University cmpus n Kenblue Kentucky bluegrss mintined t /" height f cut. Fungicides were pplied t vrius intervls s indicted in the dt chrt with ll tretments being pplied fr the first time n My 0. When fungicide tretments were suspended, the 0 dy tretments hd been pplied times, the dy tretments hd been pplied times, nd the 8 dy tretments hd been pplied twice. ll tretments were pplied with C0 smll-plt spryer t vlume f gl/cre. The study ws set up in rndmized blck design cnsisting f three replictins/tretment with plt size f ' x 6'. The plts were rted fr disese nd phyttxic effects n June 8, 98. (Tble ) 9

2 Tble Byne Highlnds Snw Mld Study Percent re infected with ll snw mlds (Typhul incrnt, Typhul ishikriensis, nd Fusrium nivle) Rtings tken /9/8 Tretment Rte/000 ft I II Repetitin III VE DMR Cl-Grn Clb-Clr BS Chipc 609 Sctts F + F II Sctts F + F II BS Chipc 609 Dcnil 787 FL Terrclr GR Terrclr WP Dcnil 787 FL cti-dine RZ EL Terrclr WP BS 600 EL EL Chipc 609 Terrclr GR OC 890 EL EL Tersn SP OC 890 GR OC 890 GR Check BS 600 Oxmide C OC 890 Oxmide F Oxmide C Oxmide F 6 lbs z. 8 z. + z. X X z. + z. 6 fl. z. 60 z. 8 z. 8 fl. z. 8 z. lb. i./ z. 8 z. lb. i./ lb. i./ z. 0 z. z.. lb. i./ lb. i./ 9 z. z. 6 z. z. lb. N. z. lb. N. lb. N. lb. N B B BC BC BC BCD BCD BCDE BC DE BCDE BC DE BCDEF BCDEF CDEFG DEFGH DEFGH DEFGH DEFGH EFGH FGHI FGHI FGHI FGHI GHI HI I I Tretments fllwed by the sme letter re nt significntly different frm ech ther t the % level. 0

3 Tble Byne Highlnds Snw Mld Study Percent re infected with Typhul incrnt snw mld Rtings tken /9/8 Tretment Rte/l000 ft Repetitin I II III VE DMR BS Chipc z. + z. Chipc 609 z. Cl~rn 6 lbs Cl-Clr z. Dcnil 787 FL 8 fl. z. *.7 Sctts F + F II X.7 EL lb. i./. 6* BS Chipc 609. z. + z.. Tersn SP 9 z Terrclr WP 8 z. 0. Sctts F + F II X 0 0 B Dcnil 787 FL 6 f. z. 7 0* * 7. B Terrclr GR 60 z. 8. B EL lb. i./ B EL lb. i./ 0* BC OC 890 WP z. * 0 0 BC Oxmide F lb. N BCD EL lb. i./ * BCD Terrclr WP z. 0 * 0.7 BCD cti-dine RZ 8 z. BCDE Oxmide C lb. N. 0 0 BCDE OC 890 WP z BCDE BS z BCDEF Oxmide C lb. N CDEF Terrclr GR 0 z DEF OC 890 GR 6 z EF OC 890 GR z. 0 7.* 0.8 EF Check FG Oxmide F lb. N FG BS 600 z G *Plts shwing infectin by Fusrium ptch (Fusrium nivle) s well s Typhul blight (Typhul incrnt). Tretments fllwed by the sme letter re nt significntly different frm ech ther t the % level.

4 Tble Byne Highlnds Snw Mld Study Percent re infected with Typhul ishikriensis snw mld Rtings tken /9/8 Tretment Rte/l000 ft I II Repetitin III VE DMR BS 600 BS 600 Cl-Grn Cl-Clr c ti -dine RZ BS Chipc 609 Sctts F + F II ScttsF + F II Dcnil 787 FL Terrclr GR BS Chipc 609 Terrclr GR Terrclr WP Terrclr WP OC 890 GR Dcnil 787 FL Check EL EL OC 890 GR EL OC 890 WP EL EL Chipc 609 Oxmide F Tersn SP OC 890 Oxmide C Oxmide C Oxmide F z. 8 z. 6 lbs z. 8 z. 8 z. + z. X X 6 fl. z. 60 z. z. + z. 0 z. z. 8 z. z. 8 fl. z. I lb. i./ lb. i./ 6 z. lb. i./. z. lb. i./. lb. i./ z. lb. N. 9 z. z. lb. N. lb. N. lb. N B B BC BC BC BCD BCD BCD BCD BC DE BCDEF BCDEF BCDEFG BCDEFG CDEFG CDEFG DEFG DEFG EFG EFG FG G Tretments fllwed by the sme letter re nt significntly different frm ech ther t the % level.

5 Tble Helminthspriurn Melting Out Fungicide Study - 98 Hncck Turfgrss Reserch Center, MSU Rting (n disese) - 9(90% infectin r greter) Rting tken June 8, 98 Tretment Rte/000 ft + Intervl I Repetitin II III VE DMR CG-6 (. EC) CG-6 (. EC) CG-6 (. EC) CG-6 (.6 EC) BTS 66 Rizlex CG-6 (.6 EC) F-968R F-968R Rizlex Dcnfl 787 FL CG-6 (. EC) CG-6 (.6 EC) Dyrene BTS 66 Rizlex Dcnil 787 FL CG-6 (. EC) CG-6 (. EC) Chipc 609 cti-dine RZ cti-dine RZ Dcnil 787 FL prchlrz Vrln BS 60 F BS 60 F Dcnil 787 FL Chipc 609 BS 60 F Dcnil 787 FL cti-dine RZ cti-dine RZ Dcnil 787 FL Cntrl fl. z. ( dy sch.) 8 fl. z. ( dy sch.) 6 fl. z. ( dy s,ch.) 8 fl. z. ( dy sch.) z. i. ( dy sch.) gm. i./m ( dy sch.) fl z. ( dy sch.) X ( dy sch.) X ( dy sch.) gm. i./m ( dy sch.) 6 fl. z. (0 dy sch.) 8 fl. z. ( dy sch.) fl. z. ( dy sch.) 6 z. ( dy sch.). z. i. ( dy sch.). gm. i./m ( dy sch.) fl. z. (0 dy sch.) fl. z. ( dy sch.) fl. z. ( dy sch.) z. ( dy sch.). z. (Fll + Spring - dy sch.). z. (Spring nly - dy sch.) 6 fl. z. ( dy sch.). z. i. ( dy sch.) z. ( dy sch.).6 z. i. ( dy sch.).8 z. i. ( dy sch.) fl. z. ( dy sch.). z. (8 dy sch.). z. i. ( dy sch.) fl. z. (0 dy sch.). z. (Fll - pp. nly). z. (Spring- pp. nly) fl. z. ( dy sch.) * * ** ** ** * 6 * * ** *** ** * * * * 7 * ** ** *** ** * * * B B BC BC BC BC BC BC BC BC BCD BCD BCD BC 0 BCD BCD BC 0 BCD BCD BCD BCD BCD BCD BCD CD DE DE DE E F * Indictes light phyttxicity. ** Indictes mderte phyttxicity. *** Indictes severe phyttxicity. pplied in X wter rte. Tretments fllwed by the sme letter re nt significntly different frm ech ther t the % level.

6 Dllrspt Fungicide Studies 98 Hncck Turfgrss Reserch Center, MSU Tw dllrspt (Sclertini hmecrp) studies were cnducted this yer. One ws estblished preventtively n n Emerld creeping bentgrss green nd nther ws estblished curtively n n nnul bluegrss re. Liquid pplictins were mde with C0 smll plt spryer t vlume f gl./cre (except s nted n dt sheets). Grnulr frmultins were pplied by hnd. Emerld Creeping Bentgrss Study Tretments were pplied preventtively t three replictins f ' x 6' plts in rndm blck design n n Emerld bentgrss green which ws irrigted nd fertilized s needed. This re ws mwed dily t /" height nd clippings were remved. ll tretments were pplied n ugust with subsequent pplictins being mde t the intervls indicted fllwing ech tretment n the dt tble. The lst tretments were pplied n September 6, t which time the 0 dy tretments hd been pplied times, the dy tretments - times, the dy tretments - times, the 8 dy tretments - twice, nd 0 dy tretments - twice. The rting ws tken n September. (Tble ) nnul Bluegrss Study Tretments were pplied curtively t three replictins f 6' x 6' plts in rndm blck design ~n n nnul blu~grss (P nnu) plt re which ws irrigted nd fertilized s needed. This re ws mwed three.times week t /8" height f cut with clippings returned. ll tretments were pplied n ugust 6 with subsequent tretments being pplied t the intervls indicted n the dt tble. The lst tretments were pplied n September with the 0 dy tretments being pplied three times, the nd the dy tretments - twice, nd the 8 nd 0 dy tretments - nce. The rtings were tken n September nd n September 9. (Tbles 6 nd 7) nthrcnse Fungicide Study - 98 Glen Gry Glf Club, Sylvni, Ohi The 98 nthrcnse (Cllettrichum grminicl) fungicide studies were estblished in tw lctins, ne t Glen Gry Cuntry Club in Sylvni, Ohi, n n irrigted P nnu (nnul bluegrss) firwy mwed t /" height f cut. The study ws lid ut in three repetitins f rndm blck design, utilizing 6' x 9' plts. ll liquid pplictins were mde with C0 smll-plt spryer, while grnulr frmultins were pplied by hnd. pplictins were mde curtively n July 7 with subsequent pplictins being mde t the intervls indicted n the dt chrt. The lst pplictins were mde n ugust t which time the 0 dy tretments hd pplictins, the dy tretements hd pplictins, nd the nd 0 dys tretments hd received pplictins. The plts were rted n ugust nd ugust 7. (Tbles 8 nd 9)

7 Tble Creeping Bentgrss Dllr Spt Fungicide Study - 98 Hncck Turfgrss Reserch Center, MSU Disese rting - number f dllr spts/plt 9//8 Tretment Rte/l000 ft + Intervl I Repetitin II III VE DMR Chipc 609 F-968R F-968R BS 60F BS 60F BS 60F Rizlex Rizlex Rizlex Vrln Vrln Tersn 99 Fung 0 Clery 6 CG-6 (. EC) CG-6 (. EC) CG-6 (. EC) CG-6 (.6 EC) CG-6 (.6 EC) CG-6 (.6 EC) CG-6 (. EC) Dcnil 787 FL + Tersn 99 CG-6 (. EC) CG-6 (. EC) CG-6 (. EC) CG-6 (. EC) Byletn Byletn Byletn Dcnil 787 FL Dcnil 787 FL Chipc 609 Dcnil 787 FL prchlrz BTS 66 BTS 66 cti-dine TGF Check. z. ( dy sch.) X ( dy sch.) X ( dy sch.). z. i. ( dy sch.).8 z. i. ( dy sch.).6 z. i. ( dy sch.). gm. i./m ( dy sch.) gm. i./m ( dy sch.) gm. i./m ( dy sch.) z. ( dy sch.) z.( dy sch.) z. ( dy sch.) z. ( dy sch.) z. ( dy sch.) fl. z. ( dy sch.) fl. z. ( dy sch.) 8 fl. z. ( dy sch.) fl. z. ( dy sch.) fl. z. ( dy sch.) 8 fl. z. ( dy sch.). fl. z. ( dy sch.) fl. z. + z. ( dy sch.) fl. z. ( dy sch.) 8 fl. z. ( dy sch.) 6 fl. z. ( dy sch.) fl. z. ( dy sch.) z. (0 dy sch ~) z. (0 dy sch.) 6. Ibs. (GR) (0 dy sch.) 6 fl. z. ( dy sch.) fl. z. (0 dy sch.). z. (8 dy sch.) fl. z. ( dy sch.). z. i. ( dy sch.). z. i. ( dy sch.) z. i. ( dy sch.). z. ( dy sch.) * 0* 0* 0* 0** 0* 0* 0* 0** 0** 0* 0* 0** 0** 0** * 0*. 0* 0** 0*** 0* 0* 0** B B C C C *Light phyttxicity **Mderte phyttxicity ***Severe phyttxicity pplied in X wter rte. Tretments fllwed by the sme letter re nt significntly different frm ech ther t the % level.

8 Tble 6 nnul Bluegrss Dllr Spt Fungicide Study -98 Hncck Turfgrss Reserch Center, MSU Disese rting scle - (n disese)-9(90% infectin r greter) Rted 9//8 Tretment Rte/l000 ft + Invervl I II Repetitin III VE DMR Dcnil Tersn 99 F-968R Byletn Prchlrz** CG-6 (. EC) F-968R Byletn Byletn (GR) Dcnil 787 FL Tersn 99 Vrl n Fung 0 BS 60F BS 60F Chipc 609 Vrln CG-6 (. EC) BS 60F Clery 6 Dcnil 787 FL Chipc 609 Dcnil 787 FL D-TGF + D-RZ BTS 66** BTS 66** Check fl. z. + z. ( dy sch.) X ( dy sch.) z. (0 dy sch.). z. i. ( dy sch.) fl. z. ( dy sch.) X ( dy sch.) z. (0 dy sch.) 6. lbs. (0 dy sch.) 6 fl. z. ( dy sch.) z. ( dy sch.) z. ( dy sch.) z. ( dy sch.). z. i. ( dy sch.).8 z. i. ( dy sch.). z. ( dy sch.) z. ( dy sch.) fl. z. ( dy sch.).6 z. i. ( dy sch.) z. ( dy sch.) fl. z. ( dy sch.). z.(8 dy sch.) fl. z. (0 dy sch.). z. +. z. ( dy sch.) z. i. ( dy sch.). z. i. ( dy sch.) * B B B BC BC BC BC 0 BCD BCD BCD BCD BCD BCD BCD BCD BCD BCD BCD CD CD DE DE EF F G *Yellwing evident. **pplied in X wter rte. Tretments fllwed by the sme letter re nt significntly different frm ech ther t the % level. 6

9 Tble 7 nnul Bluegrss Dllr Spt Fungicide Study -98 Hncck Turfgrss Reserch Center, MSU Disese rting scle - (n disese)-9(90% infectin r greter) Rted 9/9/8 Tretment Rte/000 ft + Invervl Repetitin I II III VE DMR Chipc 609. z. ( dy sch ) F-968R X ( dy sch.) F-968R X ( dy sch.) Byletn z. (0 dy sch.) BS 60F.8 z. i. ( dy sch. ) Prchlrz**. z. i. ( dy sch. ) Vrln z. ( dy sch.) Fung 0 z. ( dy sch.) CG-6 (. EC) fl. z. ( dy sch.) Byletn z. (0 dy sch.). B Byletn (GR) 6. lbs. (0 dy sch.). B BS 60F.6 z. i. ( dy sch.). B Dcnil 787 FL 6 fl. z. ( dy sch.). B Tersn 99 z. ( dy sch.). B CG-6 (. EC). fl. z. ( dy sch.). B Dcnil 787 fl. z. + z.. B + Tersn 99 ( dy sch.) BS 60F. z. i. ( dy sch. ).7 B Vrl n z. ( dy sch.).7 B Clery 6 z. ( dy sch.).7 B Chipc 609. z. (8 dy sch.) B Dcnil 787 FL fl. z. ( dy sch.).7 BC cti -dine TGF. z. ( dy sch.) *.7 CD Dcnil 787 FL fl. z. (0 dy sch.) 6. D BTS 66**. z. i. ( dy sch.) E BTS 66** z. i. ( dy sch.) E Check F *Yellwing evident. **pplied in X wter rte. Tretments fllwed by the sme letter re nt significntly different frm ech ther t the % level. 7

10 Tble 8 Glen Gry nthrcnse Fungicide Study - 98 Disese Rting - % plt re infected 8//8 Tretment Rte/l000 ft + Intervl I Repetitin II III VE DMR F-968R Tersn 99 Byletn F-968R Byletn Byletn CG-6 (. EC) CG-6 (. EC) Dus n Tersn 99 + Dcnil 787 Fung 0 prchlrz Clery 6 BTS 66 Dcnil 787 FL Byletn (GR) BS 60F Dcnil 787 FL BTS 66 Dcnil 787 FL BS 60F Dcnil 787 FL cti-dine TGF ctidine TGF + cti-dine RZ Vrln BS 60 F Vrln Oximide Check cti-dine RZ Oximide X ( d y s c h ) z. ( dy sch.) z. (0 dy sch.) lx ( dy sch.) z. (ne pp. nly) z. (0 dy sch.). z. ( dy sch.) z. ( dy sch.) z. ( dy sch.) z. + fl. z. ( dy sch.) z. ( dy sch.). z. i. ( dy sch.) z. ( dy sch.) z. i. ( dy sch.) fl. z. (0 dy sch.) 6. lbs. (ne pp. nly).6 z. i. ( dy sch.) 6 fl. z. ( dy sch.). z. i. ( dy sch.) fl. z. ( dy sch.). z. i. ( dy sch.). z. ( dy sch.). z. ( pp. nly). z. +. z. ( dy sch.) z. ( dy sch.).8 z. i. ( dy sch.) 0z ( dy sc h. ) / lb. N. (0 dy sch.) 0z. ( dy ch ) lb. N. (0 dy sch.) B BC BCD BCDE BCDE BCDEF BCDEF BCDEF BCDEFG BCDEFGH BCDEFGH CDEFGH CDEFGHI DEFGHIJ DEFGHIJ EFGHIJ FGHIJK FGHIJK GHIJKL GHIJKL HIJKL HIJKL HIJKL IJKL JKL JKL KL L L Byletn pplied 7/7 t cure plts f nthrcnse, D-TGF pplied n 7/. N phyttxicity. D-TGF pplied t. z. t plts with nthrcnse infectins n 7/. N phyttxicity. pplied in X wter rte. pplied n 7/6. Tretments fllwed by the sme letter re nt significntly different frm ech ther t the % level. 8

11 Tble 9 Glen Gry nthrcnse Fungicide Study - 98 Disese Rting - % plt re infected 8/7/8 Tretment Rte/000 ft + Intervl Repetitin I II III VE DMR Tersn 99 z. ( dy sch. ) Byletn z. (0 dy sch. ) Byletn z. (0 dy sch. ) 0. F-968R X ( dy sch.) F-968R X ( dy sch.) 0 0 B CG-6 (. EC) fl. z. ( dy sch.) 0 0 B Byletn z. (ne pp. nly) 0.7 BC BTS 66 z. i. ( dy sch.) 0.7 BC Dusn z. ( dy sch.) 8. BCD Byletn (GR).= 6. lbs. (ne pp. nly) 0 0 BC DE CG-6 (. EC). fl. z. ( dy sch.) 0.7 BCDE prchlrz. z. i. ( dy sch.) 0 0 BC DE Tersn 99 z. + fl. z BCDEF + Dcnil 787 ( dy sch.) Clery 6 z. ( dy sch.) 0 8. BCDEF Fung 0 z. ( dy sch.) 9 BCDEF Dcnil 787 FL z. (0 dy sch.) 0 0 BCDEF BTS 66. z. i. ( dy sch.) CDEFG Dcnil 787 FL fl. z. ( dy sch.) CDEFG Dcnil 787 FL 6 fl. z. ( dy sch.) 0 8. DEFG BS 60F 6 z. i ( dy sch.) 0 EFGH Vrln z. ( dy sch.) FGHI Dcnil 787 FL. z. ( dy sch.) GHIJ BS 60F 8 z. i ( dy sch.) GHIJ cti-dine TGF. z. ( dy sch.) 70 0 HIJ Oximide / lb. N. (0 dy sch.) HIJ BS 60 F. z. i. ( dy sch.) HIJ Oximide lb. N. (0 dy sch.) IJ Vrln z. ( dy sch.) J cti-dine RZ. z. ( dy sch.) J ctidine TGF. z. +. z J + cti-dine RZ ( dy sch.) Check J Byletn pplied 7/7, plts cured f nthrcnse dmge, then D-TGF t. z. pplied 7/, 8/. N phyttxicity bserved. D-TGF pplied t. z. t plts with nthrcnse dmge evident n 7/ nd 8/. N phyttxicity bserved. pplied in X wter rte. pplied n 7/6. Tretments fllwed by the sme letter re nt significntly different frm ech ther t the % level. 9

12 Fusrium Blight Fungicide S~udies - 98 Hncck Turfgrss Reserch Center, HSU The 98 Fusrium blight fungicide studies were cnducted n the Hncck Turfgrss Reserch Center n the Michign Stte University cmpus n n irrigted, lightly fertilized Fylking Kentucky bluegrss reserch re which ws mintined t /" height f cut. Vrius Byletn + Ure cmbintin tretments were pplied preventtively n June nd July. Other tretments, including Chip c 609, BTS 66, Prchlrz, CG-6, BS 60F, Fung 0, nd Tersn 99 were pplied preventtively n July nd, therefter, ccrding t cntrct. Results: Thugh Fylking Kentucky bluegrss hs, in the pst, shwn susceptibility t Fusrium blight disese, n Fusrium blight develped in ur plt re this sesn. Dcnil 787 FL Fungigtin Study - 98 Hncck Turfgrss Reserch Center, MSU Estblishment: The 98 fungigtin study ws estblished n n irrigted nnul bluegrss (P nnu) blck t the Hncck Turfgrss Reserch Center n the Michign Stte University cmpus. Undiluted Dcnil 787 (FL) ws injected directly int the irrigtin line in the pump huse t rte f pprximtely gllns/hr using Hydr-Fl Chern-Injectr single pistn pump (Hydr-Fl Crp., Mple ve., Dublin, P 897). Injectins were mde int line with wter cpcity f 600 gllns/hr. The fungigtin tretment ws pplied thrugh Nelsn pp-up irrigtin heds, ech f which ws pplying pprximtely gllns/minute. This resulted in dilutin fctr f pprximtely :00. The fungicide ws pplied t rte f 7 qurts/cre, the mximum lbel rte fr firwy pplictins. Tretments were pplied n June 9, June, July 8, July 0, ugust 6 nd ugust 0. In rder t prvide cmprisn f fungigtin versus spryer pplictin, prt f the nnul bluegrss study ws spryed with Dcnil 787 FL t 7 qts/cre using C0 smll-plt spryer perting t 0 gllns/cre. The dilutin f fungicide t wter in this cse ws pprximitely :. This reserch re ws irrigted s needed nd fertilized t ttl rte f / lb N/000 ft during the 98 sesn. The study.ws rted fr dllrspt (Sclertini hmecrp) incidence n ~gust, ugust 0, nd Siptember 0. nthrcnse (Cllettrichum grminicl) disese is nrmlly prblem n nnul bluegrss firwys, hwever, n significnt nthrcnse pressure develped in this study, therefre, n dt ws vilble. Results: Dcnil 787 cn be pplied thrugh irrigtin systems nd give effective disese mngement f Sclertini dllrspt. It ls gve stisfctry mngement f nthrcnse lthugh the disese pressure ws nt s severe this yer. 60

13 Tble 0 Dcnil 787 Fungigtin Study - 98 Hncck Turfgrss Reserch Center, MSU Dllr spt rting scle - l(n disese)-9(90% infectin r greter) Tretment Rte/cre I Repetitin II III VE DMR Rting f ugust Cnventinl spryer pplictin Fungigtin pplictin Cntrl 7 qts/cre 7 qts/cre Rting f ugust 0 Cnventinl spryer pplictin 7 qts/cre Fungigtin pplictin 7 qts/cre Cntrl Rting f September 0 Cnventinl spryer pplictin 7 qts/cre Fungigtin pplictin 7 qts/cre Cntrl

14 UpJhn cti-dine TGF - Fertilizer Study - 98 Hncck Turfgrss Reserch Center, MSU Estblishment The UpJhn cti-dne TGF + fertilizer study ws estblished n P nnu (nnul bluegrss) reserch re which ws mwed t /8" height()f cut nd irrigted s needed. Tretments were initited n My 7 nd were re-pplied n dy schedule thrugh September 6 (9 pplictins). pplictins were mde t three replictins f 6' x 9' plts in rndmized blck design using C0 smll-plt spryer t vlume f gllns/cre. The study received n supplementl nitrgen during the test perid. Rtings fr dllrspt incidence were tken n July, ugust 0, nd September 9. (Tble ) Results: cti-dne TGF pplied n dy schedule did nt give effective mngement f Sclertini dllrspt even thugh the tretments were begun befre the disese ws evident. Severl nitrgen crriers were included t help reduce the phyttxicity, help imprve turf qulity nd imprve disese mngement. There ws n significnt difference mng nitrgen crriers in imprving disese mngement. The plts were t severely infected t ccurtely rte phyttxic effect r imprved turf qulity. 6

15 Tble UpJhn cti-dine TGF Study - 98 Hncck Turfgrss Reserch Center, MSU Dllr spt rting scle - (n disese)-9(90% infectin r greter) Tretment Rte/l000 ft Repetitin I II III VE DMR Rting f July D-TGF + Ure. z gm. D-TGF + mrn. Sulf.. z +. gm D-TGF z. D-TGF + mm. Nit. z gm.. D-TGF + Fe. min. Cit.. z gm. D-TGF + Frmlene z. +.8 gm. Cntrl 7. Rting f ugust 0 D-TGF. z. D-TGF + Ure. z z. D-TGF + mm. Nit.. z z D-TGF + mm. Sulf. z. +. gm.. D-TGF + Fe. mm. Cit.. z gm B D-TGF + Frmlene. z gm B Cntrl C Rting f September 9 D-TGF. z D-TGF + Ure. z gm D-TGF + mm. Nit z gm D-TGF + mm. Sulf.. z. +. gm D-TGF + Frmlene. z. +.8 gm D-TGF + Fe. mm. Cit.. z gm B Cntrl B 6

16 Rizlex Fungicide - Turfgrss Disese Cntrl Studies - 98 Hncck Turfgrss Reserch Center, MSU Estblishment: The efficcy f the fungicide Rizlex ginst turf diseses ws studied n Kenblue Kentucky bluegrss nd n P nnu (nnul bluegrss) thrughut the 98 sesn. Tretments n Kentucky bluegrss were initited with the Helminthsprium (Melting-Out) study described previusly. These Rizlex tretments were simply cntinued n dy schedule thughut the sesn while the plts were mnitred fr phyttxicity nd dditinl disese develpment. Tretments were begun n My 0 nd cntinued thrugh September (0 pplictins). Tretments n P nnu (nnul bluegrss) were mde n dy schedule beginning n June 8 nd ending n September (7 pplictins). The fllwing dt ws generted frm dllrspt (Sclertini hmecrp) infectin which incresed thughut the sesn. Bth experiments were set up in three replictins in rndmized blck design. Tretments were pplied with C0 smll-plt spryer t vlume f gllns/cre. The studies were fertilized lightly thrughut the sesn nd irrigted s necessry t prevent wilt. The P nnu test re ws mwed t /8" height f cut while the bluegrss ws ~d t /". Results: Rizlex t the nd gm i rte gve effective disese mngement f Sclertini dllrspt, imprved turf qulity nd ws nt phyttxic t the turf. (Tble ) Estblishment: Cib Geigy -Phytxicity Study - 98 Hncck Turfgrss Reserch Center, MSU lte-sesn Vngrd (CG-6. EC) nd Bnner (CG-6. EC) phyttxicity study ws estblished t the Hncck Turfgrss Reserch Center n the Michign Stte cmpus n Emerld creeping bentgrss. Tretments were pplied s described previusly in the Emerld creeping bentgrss dllrs pt study reprt beginning n Octber. Subsequent pplictins were mde t 7 dy r dy intervls s indicted n the dt chrt thrugh Octber 7, t which time the 7 dy tretments hd been pplied fur times nd the dy tretments were pplied twice. Results: The fll Vngrd-Bnner phyttxicity study results supprted the summer findings when phytxicity ws encuntered with Bnner (CG-6. EC) n creeping bentgrss, P nnu (nnul bluegrss) nd Kentucky bluegrss. It wuld pper tht bth prducts rther cnsistently dmge turfgrsses when repetedly pplied t these rtes. Due t the nset f turf drmncy, the levels f phytxicity bserved in this study my vry slightly frm thse encuntered n ctively grwing turf. (Tble ) 6

17 Tble Rizlex Fungicide-nnul Bluegrss Disese Study - 98 Hncck Turfgrss Reserch Center, MSU Dllr spt rting scle - (n disese)-9(90% infectin r greter) Tretment Rte/m Repetitin I II III VE DMR Rting f July Rizlex gm. i.,, Rizlex grn. i. Rizlex. grn. i.,. Cntrl. B Rting f ugust 0 Rizlex gm. i. Rizlex grn i., Rizlex. gm. i. Cntrl B Rting f September 9 Rizlex gm. i. Rizlex, gm. i.. Rizlex. gm. i. B Cntrl C 6

18 Tble Cib Geigy - Phyttxicity Study - 98 Hncck Turfgrss Reserch Center, MSU Rting f 0/7/8 - Weekly tretments pplied three times - Bi-weekly ( dy) tretments pplied twice Tretment Rte/000 ft Repetitin I II III CG-6 ( E) fl. z. (weekly) CG-6 ( E) fl. z. (weekly) L M CG-6 ( E) 8 fl. z. (weekly) M M M CG-6 ( E) fl. z. (weekly) CG-6 ( E) fl. z. (weekly) CG-6 ( E) 8 fl. z. (weekly) M L M CG-6 ( E) fl. z. (bi-weekly) L CG-6 ( E) fl. z. (bi-weekly) L L CG-6 ( E) 8 fl. z. (hi-weekly) L CG-6 ( E) fl. z. (hi-weekly) CG-6 ( E) fl. z. (hi-weekly) CG-6 ( E) 8 fl. z. (hi-weekly) L L Check Rting f //8 - Weekly tretments pplied three times - Bi-weekly ( dy) tretments pplied twice Tretment Rte/000 ft Repetitin I II III CG-6 ( E) fl. z. (weekly) L M M CG-6 ( E) fl. z. (weekly) M M S CG-6 ( E) 8 fl. z. (weekly) S S S CG-6 ( E) fl. z. (weekly) L L L CG-6 ( E) fl. z. (weekly) M L M CG-6 ( E) 8 fl. z. (weekly) M L S CG-6 ( E) fl. z. (hi-weekly) M L M CG-6 ( E) fl. z. (bi-weekly) S L M CG-6 ( E) 8 fl. z. (hi-weekly) M L M CG-6 ( E) fl. z. (hi-weekly) L L L CG-6 ( E) fl. z. (bi-weekly) M L M CG-6 ( E) 8 fl. z. (hi-weekly) M L L Check Nte: L light phyttxicity M mderte phyttxicity S severe phyttxicity 66