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Reynoutria sachalinensis (giant knotweed) marketed as Regalia ® by Marrone Bio Innovations (Davis, CA) as an organic fungicide with activity against powdery mildew, gray mold, and blights increased root growth of strawberry and tomato seedlings after

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), azoxystrobin + tebuconazole (0.16 g·L –1 total a.i. applied at a 14-d interval), and the biorational product giant knotweed ( Reynoutria sachalinensis ) extract (0.5 mL·L –1 total a.i. applied at a 7-d interval) effectively reduced the powdery mildew severity

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Clarireedia jacksonii sp. nov. formerly Sclerotinia homoeocarpa F.T. Bennett, one of the causal agents of dollar spot, is the most widespread pathogen in turfgrass systems. Dollar spot (DS) affects both cool- and warm-season grasses, during a wide range of environmental conditions. Field studies were conducted at Clemson University, Clemson, SC, on a creeping bentgrass [Agrostis stolonifera L. var. palustris (Huds) cv. Crenshaw] putting green for 2 consecutive years from August to October in year 1 and July to September in year 2. The objective of the studies was to evaluate biological control agents (BCAs) and synthetic fungicides at reduced rates for their efficacy controlling dollar spot. Four replications of 1.5 × 1.5-m plots were used in the experimental design. Treatments included the following: Bacillus subtilis (BS); plant extract oils (EO) including clove oil + wintergreen oil + thyme oil; extract of Reynoutria sachalinensis (RS); Bacillus licheniformis (BL); chlorothalonil (CL); and azoxystrobin + propiconazole (AzP). Synthetic fungicides were used at reduced rates in combination with biological control agents, to evaluate curative control efficacy of various combinations. All reduced synthetic programs, except CL + EO, provided acceptable disease severity (≤15%) at the end of year 1 and acceptable (≥7) turfgrass visual quality. Azoxystrobin + propiconazole, CL, AzP + BL, AzP + EO, AzP + BS all provided ≤15% disease severity and ≥7 visual turfgrass quality 14 days after the last application in year 2.

Open Access

Innovations, Inc., Davis, CA), made from the extracts of Giant Knotweed [ Reynoutria sachalinensis (F. Schmidt) Nakai syn. Polygonum sachalinense (F. Schmidt)], was found to function as an apple bloom thinner ( Peck et al., 2016 ; Yoder et al., 2013 ). Our

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., 1998 ). Botanical products [e.g., giant knotweed ( Reynoutria sachalinensis ) extract] and mineral salts (e.g., mono and di-basic salt of phosphorous) also have been used for botrytis blight management in various crops ( Reddy, 2016 ). However

Open Access