Phosphonic (Phosphorous) Acid Treatments Control Phytophthora Diseases in Avocado and Pineapple.

Pegg, K. G.; Whiley, A. W.; Hargreaves, P. A.

doi:10.1071/app9900122

Cited by 11 publications

(5 citation statements)

References 3 publications

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“…Phosphite is a systemic fungicide that can be applied as a drench, foliar spray or by trunk injection to control a number of Oomycete diseases in many horticultural and ornamental crops (Dolan and Coffey 1988;Pegg et al 1990; Wicks and Hall 1990;Greenhalgh et al 1994;El-Hamalawi and Menge 1995). In Western Australia, Phytophthora cinnamomi Rands is an aggressive root pathogen that causes dieback in a wide range of native plant species (Shearer 1994;Shearer and Dillon 1995).…”

Section: Introductionmentioning

confidence: 99%

Phosphite and mycorrhizal formation in seedlings of three Australian Myrtaceae

Howard¹,

Dell²,

Hardy³

2000

Aust. J. Bot.

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Currently in Western Australia, phosphite is being used to contain the root and collar rot pathogen, Phytophthora cinnamomi, in native plant communities. There have been reports of negative effects of phosphite on arbuscular mycorrhiza (AM), so there are concerns that it may have a deleterious effect on other mycorrhizal fungi. Two glasshouse experiments were undertaken to determine the impact of phosphite on eucalypt-associated ectomycorrhizal fungi. In the first experiment, non-mycorrhizal seedlings of Eucalyptus marginata, Eucalyptus globulus and Agonis flexuosa were sprayed to runoff with several concentrations of phosphite, and then planted into soil naturally infested with early colonising mycorrhizal species. Assessments were made of percentage of roots infected with mycorrhizal fungi. There was no significant effect on ectomycorrhizal formation but there was a four-fold increase in AM colonisation of A. flexuosa roots with phosphite application. In the second experiment, E. globulus seedlings mycorrhizal with Pisolithus, Scleroderma and Descolea were treated with different levels of phosphite and infection of new roots by ectomycorrhizal fungi was assessed. There was no significant effect on ectomycorrhizal formation when phosphite was applied at the recommended rate (5 g L–1), while at 10 g L–1 phosphite significantly decreased infection by Descolea.

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Section: Introductionmentioning

confidence: 99%

Phosphite and mycorrhizal formation in seedlings of three Australian Myrtaceae

Howard¹,

Dell²,

Hardy³

2000

Aust. J. Bot.

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“…In plant tissues, fosetyl-Al, the active ingredient in Aliette fungicide, degrades to phosphorous acid (H 3 PO 3 ) (Coffey and Bower, 1984). Phosphorous acid dips, foliar sprays, or trunk injections were successful in controlling P. cinnamomi in avocado and pineapple [Ananas comosus (L.) Merr] (Pegg et al, 1990); P. palmivora in cocoa (Anderson and Guest, 1990;Holderness, 1990); P. cambivora in almond (Prunus amygdalus Batsch) and cherry (Prunus avium L.) (Wicks and Hall, 1990); and P. cactorum in peach (Prunus persica L. Batsch), apricot (Prunus armeniaca L.) (Lim et al, 1990) and strawberry (Ellis et al, 1998). Thus, our results support fi ndings in other studies of successful control of multiple phytophthora diseases with H 3 PO 3 .…”

Section: Discussionmentioning

confidence: 99%

“…Metalaxyl has been benefi cial when used as a component of an integrated management system including raised beds and/or genetic host resistance (Maloney et al, 1993;Wilcox et al, 1999b). Various forms of phosphorous acid also have been used in the management of different phytophthora diseases (Bristow and Windom, 1992;Lim et al, 1990;Pegg et al, 1990;Wicks and Hall, 1990).…”

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confidence: 99%

Suppression of Phytophthora Root Rot in Red Raspberries with Cultural Practices and Soil Amendments

Maloney¹,

Pritts²,

Wilcox³

et al. 2005

HortSci

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Various soil amendments and cultural practices were examined in both a phytophthora-infested (Phytophthora fragariae var. rubi) (+PFR) and uninfested field (–PFR) planted to `Heritage' red raspberries. Although plants in the +PFR field did not exhibit typical disease symptoms due to unseasonably dry weather, their growth was less than those in the –PFR field. After 2 years, plants in the +PFR site had the highest yields in plots treated with phosphorous acid or amended with gypsum, whereas compost-amended plots had the lowest yields in both +PFR and –PFR sites. A second field study confirmed the positive effect of gypsum on growth and yield of raspberries in an infested site. In a third study, `Titan' raspberries grown under greenhouse conditions in pots containing unamended soil from the infested site, then flooded, exhibited severe disease symptoms; however, pasteurization of the soil, treatment with phosphorous acid and metalaxyl fungicide, or gypsum amendment mostly prevented symptoms from developing. These three studies suggest that a preplant soil amendment containing certain readily available forms of calcium, such as found in gypsum, can help suppress phytophthora root rot and increase survival, growth and yield of raspberries in sites where the pathogen is present.

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“…In a current long-term study, potassium phosphite is being evaluated for its potential to protect tanoaks from P. ramorum in forest settings (Phytosphere Research 2013). This treatment has also demonstrated efficacy in protecting avocado, pineapple (Ananas comosus), and cocoa (Theobroma cacao L.) crops as well as jarrah (Eucalyptus marginata) (Pegg et al 1990).…”

Section: Chemical or Pesticidal Controlmentioning

confidence: 99%

Management of Landscapes for Established Invasive Species

Poland

Juzwik

Rowley

et al. 2021

Invasive Species in Forests and Rangelands of the United States

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Long-term management strategies are invoked once an invasive species has become established and spread beyond feasible limits for eradication or containment. Although an invasive species may be well-established in small to large geographical areas, prevention of its spread to non-affected areas (e.g., sites, regions, and cross-continent) through early detection and monitoring is an important management activity. The level for management of established invasive species in the United States has increasingly shifted to larger geographical scales in the past several decades. Management of an invasive fish may occur at the watershed level in the western States, with watershed levels defined by their hydrologic unit codes (HUC) ranging from 2 digits at the coarsest level to 8 digits at the finest level (USGS 2018). Invasive plant management within national forests, grasslands, and rangelands can be implemented at the landscape level (e.g., Chambers et al. 2014), although management can still occur at the stand or base level. Landscapes in this chapter refer to areas of land bounded by large-scale physiographic features integrated with natural or man-made features that govern weather and disturbance patterns and limit frequencies of species movement (Urban et al. 1987). These are often at a large physical scale, such as the Great Basin.

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Phosphonic (Phosphorous) Acid Treatments Control Phytophthora Diseases in Avocado and Pineapple.

Cited by 11 publications

References 3 publications

Phosphite and mycorrhizal formation in seedlings of three Australian Myrtaceae

Phosphite and mycorrhizal formation in seedlings of three Australian Myrtaceae

Suppression of Phytophthora Root Rot in Red Raspberries with Cultural Practices and Soil Amendments

Management of Landscapes for Established Invasive Species

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