Control of Phytophthora Root Rot of Avocado With Phosphorous Acid.

Pegg, K. G.; Whiley, A. W.; Saranah, J. B.; Glass, R. J.

doi:10.1071/app9850025

Cited by 67 publications

(23 citation statements)

References 7 publications

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“…Therefore, optimising vertical drainage should effectively reduce the period of soil saturation and subsequent damage due to disease (Duniway 1983). Improving soil drainage through mounding has been shown to be an important part of the integrated disease management strategy used in avocado orchards prone to attack by Phytophthora (Broadley 1992;Pegg and Whiley 1987). The use of mounds in our field experiment also achieved this result by reducing plant losses due to root rot and substantially increasing fruit yield.…”

Section: Discussionsupporting

confidence: 61%

“…Prior to the registration of potassium phosphonate in avocados, metalaxyl was widely used for Phytophthora root rot control (Pegg and Whiley 1987). However, under the high disease pressure experienced in our field experiment, the disease control achieved with metalaxyl was disappointing as it failed to provide an adequate level of root rot control.…”

Section: Discussionmentioning

confidence: 44%

“…Although the most suitable papaya-growing soils in far north Queensland are well-drained loams, these soils are likely to remain saturated for prolonged periods during heavy wet seasons. Improving soil drainage through mounding and mulch application has been used successfully in avocado to manage Phytophthora root rot (Broadley 1992;Pegg and Whiley 1987). This paper reports a field experiment that tested metalaxyl granules and potassium phosphonate soil drenches and foliar sprays at varying rates and frequency of application for the control of Phytophthora root rot of papaya.…”

Section: Introductionmentioning

confidence: 99%

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The use of metalaxyl and potassium phosphonate, mounds, and organic and plastic mulches, for the management of Phytophthora root rot of papaya in far northern Queensland

Vawdrey¹,

Grice

Peterson

et al. 2004

Austral. Plant Pathol.

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Abstract. Options for the control of root rot of papaya caused by Phytophthora palmivora were evaluated in two field experiments in far northern Queensland, Australia. In the first experiment, foliar sprays of potassium phosphonate (10 g/L) applied fortnightly reduced the incidence of root rot by 47%. Metalaxyl granules (1.25 g/m 2 ) applied every 6 weeks, and metalaxyl granules (1.25 g/m 2 ) applied at transplanting combined with fortnightly foliar sprays of potassium phosphonate (10 g/L) also provided a level of control. Fortnightly foliar sprays of potassium phosphonate (5 g/L) and monthly foliar sprays of potassium phosphonate (5 and 10 g/L), and fortnightly and monthly soil drenches with potassium phosphonate (1 and 2 g/L) had no significant effect (P > 0.05) on the incidence of root rot. In the second experiment, growing papaya on 0.75 m mounds reduced the incidence of root rot by 38.4% and significantly increased fruit yield. Soil covers of 2 m wide plastic mulch and organic mulch in combination with 0.75 m mounds, further reduced plant losses by 20 and 10%, respectively. Plastic mulch on flat ground was as effective as the mounded treatments in reducing the incidence of root rot and increasing yield.A P 0 3 0 8 7 M a n a g e m e n t o f P h y t o p h t h o r a r o o t r o t o f p a p a y a L . L . V a w d r e y e t a l .

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Section: Discussionsupporting

confidence: 61%

Section: Discussionmentioning

confidence: 44%

Section: Introductionmentioning

confidence: 99%

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The use of metalaxyl and potassium phosphonate, mounds, and organic and plastic mulches, for the management of Phytophthora root rot of papaya in far northern Queensland

Vawdrey¹,

Grice

Peterson

et al. 2004

Austral. Plant Pathol.

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“…Phosphite has been recommended as a plant protectant (Fenn & Coffey, 1984;Rohrbach & Schenck, 1985;Guest & Grant, 1991;Wilkinson et al, 2001) and inducer of host resistance against Phytophthora (Pegg et al, 1985;Smillie et al, 1989;Candela et al, 1995;Jackson et al, 2000). Fitofós, a commercial phosphite formulation, is considered to stimulate phytoalexin production, inhibit- ing and arresting pathogen development and enhancing host defense mechanism (Guest, 1984;Saindrenan et al, 1988).…”

Section: Introductionmentioning

confidence: 99%

Phosphite effect on hot and sweet pepper reaction to Phytophthora capsici

Sala

Costa²,

Echer

et al. 2004

Sci. agric. (Piracicaba, Braz.)

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Phosphite has been recommended to enhance plant resistance against Phytophthora. This work evaluated the response of hot and sweet pepper (Capsicum annuum L.) to Phytophthora capsici from juvenile up to the adult stage following treatment with phosphite. Sweet pepper hybrids considered to be resistant to P. capsici, like Reinger, Nathalie and Athenas, were evaluated. The susceptible checks were hybrid Magali R and cvs.

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“…Control of avocado root rot is mainly achieved by the use of healthy nursery trees, moderately resistant rootstocks, and cultural and chemical methods. Metalaxyl applied as soil drenches, and phosphonate fungicides (which include phosetyl-Al and its breakdown product, phosphorous acid) applied to the foliage or injected into the trunks, both control the disease in established orchards (Darvas et al, 1984;McKenzie, 1984;Pegg et al, 1985;Wood et al, 1987;Onsando & Gathungu, 1988). Fumigants such as methyl bromide + chloropicrin are applied to soil prior to planting (Zentmyer, 1980).…”

Section: Introductionmentioning

confidence: 99%

Effect of soil solarization on the control of Phytophthora root rot in avocado

et al. 1997

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Phytophthora root rot is of paramount importance in avocado orchards of southern Spain. Soil solarization has been demonstrated to control the pathogen in infested areas from which infected trees had been removed. We aimed to determine whether soil solarization in established avocado orchards controls the disease. Soil solarization increased average maximum hourly soil temperatures by 6.5–6.9°C in unshaded areas of avocado orchards in coastal areas of southern Spain, depending on depth and year. The corresponding temperatures in shaded areas were c. 2–3°C lower. P. cinnamomi in soil, on infected avocado rootlets, and in a nutrient substrate buried at 30–60 cm depth was reduced to negligible amounts after 6–8 weeks of solarization in both unshaded and shaded locations of avocado orchards. P. cinnamomi could not be detected in avocado rootlets up to 14 months later, suggesting a long‐term effect. Soil solarization did not affect growth of the trees, and fruit yields were increased as compared with control plots. Following soil solarization for 3 weeks from mid‐July 1994, when maximum hourly temperatures reached 33–36°C, P. cinnamomi could not be recovered from a depth of up to 45 cm in unshaded areas or from a depth of up to 30 cm in shaded areas after the initial 10‐day period. The viability of inoculum of the pathogen buried at depths between 15 and 60 cm in bare soil was determined by sequential sampling in two solarization experiments starting 12 June and 4 July 1995, respectively. In the first experiment, P. cinnamomi could not be detected at any depth after 4–8 weeks of solarization in unshaded areas but could be recovered at all depths except 15 cm in shaded areas. In the second experiment, where temperatures were higher and the soil surface not shaded, P. cinnamomi could not be recovered after 2 weeks at 15 and 30 cm.

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Control of Phytophthora Root Rot of Avocado With Phosphorous Acid.

Cited by 67 publications

References 7 publications

The use of metalaxyl and potassium phosphonate, mounds, and organic and plastic mulches, for the management of Phytophthora root rot of papaya in far northern Queensland

The use of metalaxyl and potassium phosphonate, mounds, and organic and plastic mulches, for the management of Phytophthora root rot of papaya in far northern Queensland

Phosphite effect on hot and sweet pepper reaction to Phytophthora capsici

Effect of soil solarization on the control of Phytophthora root rot in avocado

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