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IS# Priority Commodity (Crop Group) Pest Project Status Discipline Use Site IS00344 X CUCURBIT VEGETABLES (09 = CUCURBIT VEGETABLES GROUP) Powdery Mildew (All species) Research Completed Plant Pathology Field Only

Problem Code: Orgnc Requesting State(s): McGrath,Margaret (NY) ; Straw,Allen (VA) ; Rahman,Mahfuz (WV) ; Miller,Sally (OH) ; Stone,Alex (OR) Potential Products: PCR Reason for Need: (8/18/2020) McGrath,Margaret: Most widespread disease of crop group. Organic growers need more effective products. Conventional growers have expressed interest in incorporating biopesticides into their fungicide programs. There are new products to consider evaluating including MBI-121, Theia, Guarda (not organic). (9/2/2020) Rahman,Mahfuz: We have increasing number of organic growers, who do not want to use any harsh chemicals. (9/2/2020) Miller,Sally: Biopesticides may be helpful in fungicide resistance management. Fungicide resistance is an important issue in powdery mildew pathogens. (9/3/2020) Stone,Alex:Powdery mildew is increasingly problematic in Oregon, and organic farmers need materials for its control. PCR Details: Study Goals: The purpose of this study was to generate efficacy and crop safety data for a variety of organic fungicides. This research aimed to support the registration of effective and safe management tools for cucurbits to control downy mildew and powdery mildew. Treatments were applied preventatively as weekly foliar sprays to cucumber, pumpkin and squash. Products were tested alone and in combinations or rotations, including 1) Kocide 3000 (copper hydroxide), 2) Microthiol Disperss (sulfur), 3) MBI-121 (extract of Reynoutria sachalinensis + Bacillus nakamurai), 4) Theia (Bacillus subtilis strain AFS032321), 5) Trillium (thyme oil), 6) Serifel (Bacillus amyloliquefaciens strain MBI 600), 7) Ranman (cyazofamid), 8) Orondis Ultra (mandipropamid + oxathiapiprolin), 9) Stargus (Bacillus amyloliquefaciens strain F727), 10) Regalia (extract of Reynoutria sachalinensis), 11) Proline (prothioconazole), 12) Vivando (metrafenone), 13) Cevya (mefentrifluconazole), and 14) Prolivo (pyriofenone). Disease incidence and severity as well as number of fruits per plant and phytotoxicity data were collected when and where feasible [HQ: 10/25 AA]. Comments Study Accomplishments:

Trial Detail   ( Records counts: 6 )

Trial Number Trial Year Trial State Institution Coordinator Researcher Protocol Report Data To MFG Performance Results and Comments IS00344-21-CA01 2021 CA Cooperative Extension Fresno County Kathryn Homa Turini, Tom IS00344-21   FINAL REPORT HAS NOT BEEN RECEIVED AT PRESENT [HQ: 8/25 AA]. IS00344-21-MI01 2021 MI Michigan State University Kathryn Homa Mary Hausbeck IS00344-21 Yes   DOWNY MILDEW MANAGEMENT IN CUCUMBERS: FOUR SPRAYS WERE APPLIED WEEKLY. IN TERMS OF FOLIAR LESIONS, ALL BIORATIONAL PRODUCTS (EXCEPT TRILLIUM) WERE NOT DIFFERENT FROM THE UNTREATED CONTROL. IN TERMS OF FOLIA NECROSIS, ALL TESTED PRODUCTS DID NOT REDUCE DISEASE COMPARED TO UNTREATED CONTROL. ONLY STANDARD CONTROL KOCIDE 3000 SIGNIFICANTLY REDUCED DISEASE. POWDERY MILDEW MANAGEMENT IN PUMPKINS: NINE WEEKLY SPRAYS WERE APPLIED. NONE OF THE TESTED BIOPESTICIDES WERE ABLE TO MANAGE POWDERY MILDEW. ALTHOUGH THEIA SIGNIFICANTLY DID NOT REDUCE THE DISEASE ITS ABILITY TO CONTROL THE DISEASE WAS SIGNIFICANTLY SIMILAR TO STANDARD CONTROL KOCIDE 3000. IS00344-21-NY01 2021 NY Cornell University Kathryn Homa Margaret Tuttle McGrath IS00344-21 Yes   DOWNY MILDEW MANAGEMENT IN CUCUMBERS: SIX SPRAYS WERE APPLIED WEEKLY BEGINNING ON 28 JULY. ALL TESTED PRODUCTS AND GROWER STANDARD KOCIDE 3000 WERE NOT ABLE TO REDUCE THE DISEASE INCIDENCE, DISEASE SEVERITY ON LEAVES AND DISEASE SEVERITY ON CANOPY. RESEARCHER THINK THAT LACK OF EFFICACY MAY BE PARTLY DUE TO DOWNY MILDEW HAVING ALREADY STARTED TO DEVELOP IN THE EXPERIMENT AT THE TIME OF FIRST APPLICATION, WHICH IS EARLIER THAN PREVIOUS YEARS. NUMBER OF FRUITS PER PLANT IN TRIL-21 WAS SIGNIFICANTLY GREATER THAN UNTREATED CONTROL AND MBI-121, BUT NOT SIGNIFICANTLY GREATER THAN OTHER TREATMENTS. NO PHYTOTOXICITY WAS OBSERVED ON CULTIVAR “MARKETMORE76”. POWDERY MILDEW MANAGEMENT IN PUMPKINS: SIX SPRAYS WERE APPLIED. POWDERY MILDEW SIGNS WERE OBSERVED BOTH ON UPPER AND LOWER SURFACE FOR DATA COLLECTION. ALL TESTED PRODUCTS REDUCED POWDERY MILDEW WHEN COMPARED WITH UNTREATED CONTROL. ALSO, ALL TESTED PRODUCTS (INCLUDING STANDARD CONTROL KOCIDE 3000) HAD STATISTICALLY SIMILAR EFFICACY EXCEPT AVIV + TIMOREX ACT, WHICH HAD SLIGHTLY HIGHER DISEASE BUT LOWER DISEASE THAN UNTREATED CONTROL. NO TREATMENT CONTROLLED POWDERY MILDEW ON LOWER LEAF SURFACES. PHYTOTOXICITY WAS NOT OBSERVED ON CULTIVAR “GOLD CHALLENDER”. IS00344-22-CA01 2022 CA Cooperative Extension Fresno County Alice Axtell Turini, Tom IS00344-22 Yes   FOUR SPRAYS WERE APPLIED FOR EACH TREATMENT AT 7±1-DAY INTERVAL. MICROTHIOL DISPRESS WP (SULFUR) 4 LB/A, MBI-121 (EXTRACT OF REYNOUTRIA SACHALIENSIS + BACILLUS NAKAMURAI) 35 FL. OZ/A ALTERNATED WITH MICROTHIOL DISPRESS WP (SULFUR) 4 LB/A, AND THEIA (BACILLUS SUBTILIS STRAIN AFS032321) ALTERNATED WITH MICROTHIOL DISPRESS (SULFUR) SIGNIFICANTLY (P=0.05) REDUCED POWDERY MILDEW ON UPPER AND LOWER SURFACES COMPARED TO UNTREATED CONTROL IS00344-22-MI01 2022 MI Michigan State University Alice Axtell Mary Hausbeck IS00344-22 Yes   DOWNY MILDEW MANAGEMENT IN CUCUMBERS: TWO TREATMENT SPRAYS WERE APPLIED AT 7-DAY INTERVAL. MBI-121 EC 3 QT, MBI-121 EC 3 QT ALTERNATED WITH KOCIDE 3000 WP 1.25 LB, TRILLIUM EC 1% (V/V), THEIA WP 3 LB THEIA WP 3 LB ALTERNATED WITH KOCIDE 3000 WP1.25 LB, AND COMMERCIAL STANDARD KOCIDE 3000 WP 1.25 LB DID NOT REDUCE DOWNY MILDEW COMPARED TO UNTREATED CONTROL. NO PHYTOTOXICITY WAS OBSERVED DURING THE DURATION OF THE TRIAL. POWDERY MILDEW MANAGEMENT IN SQUASH: FIVE SPRAYS WERE APPLIED FOR EACH TREATMENT AT 7-DAY INTERVAL. MICROTHIOL DISPRESS WP 5 LB/A, AND MBI-121 EC 3 PT/A ALTERNATED WITH MICROTHIOL DISPRESS WP 5 LB/A SIGNIFICANTLY (P=0.05) REDUCED POWDERY MILDEW ON UPPER AND LOWER SURFACES COMPARED TO UNTREATED CONTROL. IN ADDITION, THEIA WP 3LB/A, AND TRILLIUM EC 1% V/V SIGNIFICANTLY REDUCED DISEASE ON LOWER LEAF SURFACE ONLY WHEREAS THEIA WP 3LB/A ALTERNATED WITH MICROTHIOL DISPRESS WP 5 LB SIGNIFICANTLY REDUCED DISEASE ON UPPER LEAF SURFACE ONLY. MBI-121 EC 3 QT/A WAS NOT ABLE TO CONTROL THE DISEASE ON BOTH LEAF SURFACES. NO PHYTOTOXICITY WAS OBSERVED. IS00344-22-NY01 2022 NY Cornell University Alice Axtell Margaret Tuttle McGrath IS00344-22 Yes   DOWNY MILDEW MANAGEMENT IN CUCUMBERS: SEVEN TREATMENT SPRAYS WERE APPLIED AT 7-DAY INTERVAL. ONLY SERIFEL (B. AMYLOLIQUEFACIENS STRAIN MBI 600) 10 OZ/A ALTERNATED WITH RANMAN (CYAZOFAMID) 2.1 FL. OZ/A AND ORONDIS ULTRA (MANDIPROPAMID + OXATHIAPIPROLIN) 8 FL. OZ/A SIGNIFICANTLY REDUCED CUCUMBER DOWNY MILDEW. NO PHYTOTOXICITY WAS OBSERVED IN THIS TRIAL. POWDERY MILDEW MANAGEMENT IN SQUASH: NINE SPRAYS WERE APPLIED FOR EACH TREATMENT. ALL TREATMENTS EXCEPT UNTREATED CONTROL SIGNIFICANTLY REDUCED POWDERY MILDEW ON UPPER SURFACE OF PUMPKIN. HOWEVER, ONLY MICROTHIOL DISPRESS (SULFUR) 5 LB/A, STARGUS (B. AMYLOLIQUEFACIENS STRAIN F727) ALTERNATED WITH REGALIA (EXTRACT OF REYNOUTRIA SACHALIENSIS) 63 FL. OZ/A AND MICROTHIOL DISPRESS (SULFUR) 5 LB/A, THEIA (B. SUBTILIS STRAIN AFS032321) 3 LB/A ALTERNATED WITH MICROTHIOL DISPRESS (SULFUR) 5 LB/A, SERIFEL (B. AMYLOLIQUEFACIENS STARIN MBI 600) 10 OZ/A ALTERNATED WITH PROLINE (PROTHIOCONAZOLE) 5.7 FL. OZ/A AND VIVANDO (METRAFENONE) 15.4 FL. OZ/A, CEVYA (MEFENTRIFLUCONAZOLE) 5 FL. OZ/A AND PROLIVO (PYRIOFENONE) 5 FL. OZ/A SIGNIFICANTLY CONTROLLED POWDERY MILDEW ON BOTH UPPER AND LOWER SURFACES OF PUMPKIN. NO PHYTOTOXICITY WAS OBSERVED.