Using Soil-Applied Fungicides to Manage Phytophthora Crown and Root Rot on Summer Squash

Meyer, Michael D.; Hausbeck, M. K.

doi:10.1094/pdis-12-11-1071-re

Cited by 25 publications

(15 citation statements)

References 32 publications

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“…Penthiopyrad, when used as a drench, provided excellent disease control similar to the industry standard, azoxystrobin. This result is consistent with Meyer and Hausbeck (2013), who showed that fungicide drenches were generally more effective in controlling Phytophthora capsici Leonian on summer squash than foliar applications in greenhouse and field trials, since this method allows the fungicide to be in close proximity or directly contact the plant roots targeted by the pathogen.…”

Section: Discussionsupporting

confidence: 90%

Penthiopyrad applied in close proximity to Rhizoctonia solani provided effective disease control in sugar beet

Liu

Khan

2016

Crop Protection

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Section: Discussionsupporting

confidence: 90%

Penthiopyrad applied in close proximity to Rhizoctonia solani provided effective disease control in sugar beet

Liu

Khan

2016

Crop Protection

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“…Ethaboxam (Cortright et al 2016;Kim et al 2004), fluopicolide and mandipropamid (Cerkauskas et al 2015;Foster and Hausbeck 2010;Jackson et al 2010;Jiang et al 2015;Meyer and Hausbeck 2013;Shin et al 2010), and oxathiapiprolin (Bittner and Mila 2016;Ji and Csinos 2015;Ji et al 2014;Miao et al 2016) were previously shown to provide a high level of control for a range of foliar and root diseases of field and vegetable crops caused by species of Phytophthora. However, our study is the first validation of the effective use of the new compounds on a perennial tree crop, and the results presented are facilitating their registration on citrus.…”

Section: Discussionmentioning

confidence: 99%

Evaluation of New Oomycota Fungicides for Management of Phytophthora Root Rot of Citrus in California

et al. 2019

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Phytophthora root rot, caused by several species of Phytophthora, is an important disease of citrus in California and other growing regions. For chemical management, mefenoxam and potassium phosphite have been available for many years, and resistance in Phytophthora spp. has been reported for both compounds. We evaluated the efficacy of the new Oomycota fungicides ethaboxam, fluopicolide, mandipropamid, and oxathiapiprolin, each with a different mode of action, against Phytophthora root rot of citrus in field and greenhouse studies. Root balls of navel orange trees on ‘Carrizo citrange’ rootstock were inoculated with P. nicotianae at planting in the field in fall 2013. Applications with 11 fungicide treatments were made 5 weeks after planting, in spring and fall 2014, and in spring 2015. Feeder roots and adjacent soil were collected before or after application. All of the new fungicides significantly reduced root rot incidence and Phytophthora soil populations to very low levels as compared with the control starting after the first application. Mefenoxam was only effective when a high label rate was used in the fourth application. Selected treatments also increased tree canopy size, trunk diameter, and fruit yield as compared with the control. A rate comparison with the four new fungicides was initiated in summer 2016 in another field trial using navel orange trees inoculated with P. citrophthora. Minimum effective rates to reduce Phytophthora root rot incidence and pathogen soil populations were determined after one and two applications in fall 2016 and summer 2017, respectively. Greenhouse studies confirmed the efficacy of the new fungicides. Based in part on our studies, fluopicolide recently received a federal and oxathiapiprolin a full registration for use on citrus, and registrations for ethaboxam and mandipropamid have been requested. These new compounds will provide highly effective treatment options and resistance management strategies using rotation and mixture programs for the control of Phytophthora root rot of citrus.

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“…The importance of fungicides in a phytophthora management program was highlighted with a >10% yield increase in AP4835, AP4839, 'Aristotle', and 'Camelot X3R' in MI, and all entries except 'Paladin' in NJ. Foliar fungicide sprays have traditionally been used to manage P. capsici diseases (Hausbeck and Lamour, 2004) but have been shown to be less effective than soil-directed sprays and applications via drip irrigation Meyer and Hausbeck, 2013). In a greenhouse trial, soil drenches reduced pepper root rot more than foliar sprays of the same fungicides .…”

Section: Discussionmentioning

confidence: 99%

“…Raised-bed plant culture and trickle irrigation are used in fresh market pepper production to improve yields and reduce phytophthora infection (Bosland and Votava, 2012;Hausbeck and Lamour, 2004;Ristaino, 1991). Judicious application of fungicides via drip lines or as soil-directed sprays can provide additional control Kuhn et al, 2011;Meyer and Hausbeck, 2013). A drip-injected fungicide program that contained mandipropamid (Revus SC; Syngenta Crop Protection, Greensborough, NC) alternated with fluopicolide (Presidio SC; Valent Co., Walnut Creek, CA) provided 75% control of P. capsici root and crown rot of summer squash [Cucurbita pepo (Kuhn et al, 2011) squash in MI, the incidence of phytophthora root rot was reduced to £10% compared with 100% for the control (Meyer and Hausbeck, 2013).…”

mentioning

confidence: 99%

“…Judicious application of fungicides via drip lines or as soil-directed sprays can provide additional control Kuhn et al, 2011;Meyer and Hausbeck, 2013). A drip-injected fungicide program that contained mandipropamid (Revus SC; Syngenta Crop Protection, Greensborough, NC) alternated with fluopicolide (Presidio SC; Valent Co., Walnut Creek, CA) provided 75% control of P. capsici root and crown rot of summer squash [Cucurbita pepo (Kuhn et al, 2011) squash in MI, the incidence of phytophthora root rot was reduced to £10% compared with 100% for the control (Meyer and Hausbeck, 2013). Despite the effectiveness of soilapplied fungicides in phytophthora management, the labels of oomycetespecific fungicides may not support this application method (Bird et al, 2016;Sanogo and Ji, 2012;Wyenandt et al, 2016).…”

mentioning

confidence: 99%

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Evaluation of Pepper Root Rot Resistance in an Integrated Phytophthora Blight Management Program

Krasnow

Wyenandt

Kline

et al. 2017

hortte

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Phytophthora crown and root rot, incited by Phytophthora capsici, is an important and limiting disease in bell pepper (Capsicum annuum) production in many vegetable-producing areas of the United States. Soilborne oospores initiate disease when conditions are favorable, and polycyclic production of sporangia and zoospores occurs on infected plant tissue during the production season. Raised-bed plant culture, resistant cultivars, and oomycete-specific fungicides are commonly used to manage P. capsici. The objective of this study was to evaluate four bell pepper cultivars and four experimental breeding entries (collectively termed entries) for resistance to P. capsici in Michigan (MI) and New Jersey (NJ) and to determine the effect of a fungicide program on plant health and yield. The pepper cultivars included Camelot X3R (susceptible), Aristotle (intermediately resistant), and Paladin and Archimedes (resistant) for comparison. Disease symptoms included plant wilting and sunken necrotic stem lesions. In NJ, blighting of stems and foliage was also observed. In MI, >90% of the susceptible ‘Camelot X3R’ plants in the untreated plot wilted and died in both years of the study. All other entries had <10% plant wilting and death in 2014. In 2015, ‘Archimedes’ and ‘Paladin’ had <10% wilt and plant death; ‘Aristotle’, AP4835, 13SE12671, and AP4841 had 10% to 30% symptomatic plants. The fungicide program reduced disease to <10% for all entries except ‘Camelot X3R’ in 2014 and ‘Aristotle’ and ‘Camelot X3R’ in 2015. In NJ, ‘Paladin’, ‘Aristotle’, and ‘Camelot X3R’ (2014) and ‘Archimedes’, ‘Aristotle’, and ‘Camelot X3R’ (2015) had >30% plant wilting and death in the untreated plot. In the fungicide-treated plot, AP4841, AP4835, and AP4839 (2014), and AP4839 (2015) had <10% of plants with disease symptoms; ‘Camelot X3R’ and ‘Aristotle’ had >40% plant wilting and death in both years. In MI, marketable yield for ‘Paladin’ in fungicide-treated and untreated plots was significantly higher than the other entries in both years (P < 0.05). AP4839 was the highest yielding entry in NJ in the untreated plot, and AP4839 and ‘Archimedes’ were highest yielding in the fungicide-treated plot in 2014 and 2015, respectively. Fruit size for 13SE12671 was the largest among entries in both locations. There was no entry × fungicide program interaction in MI.

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Using Soil-Applied Fungicides to Manage Phytophthora Crown and Root Rot on Summer Squash

Cited by 25 publications

References 32 publications

Penthiopyrad applied in close proximity to Rhizoctonia solani provided effective disease control in sugar beet

Penthiopyrad applied in close proximity to Rhizoctonia solani provided effective disease control in sugar beet

Evaluation of New Oomycota Fungicides for Management of Phytophthora Root Rot of Citrus in California

Evaluation of Pepper Root Rot Resistance in an Integrated Phytophthora Blight Management Program

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