Association of a second phase of mortality in cucumber seedlings with a rapid rate of metalaxyl biodegradation in greenhouse soils

Al-Sadi, Abdullah M.; Drenth, A.; Deadman, M. L.; Al‐Said, F. A.; Khan, Iqrar Ahmad; Aitken, E. A. B.

doi:10.1016/j.cropro.2008.01.007

Cited by 15 publications

(2 citation statements)

References 25 publications

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“…Chemical control through the use of several fungicides such as mefenoxam and hymexazol is widely practiced (Al-Sadi, 2012; Matić et al, 2019). However, several studies have shown failure of chemical control due to several reasons, including the development of fungicide resistance, rapid biodegradation of fungicides in soil and delayed activation of the pathogen following application of the fungicide (Eckert, 1988; Al-Sa’di et al, 2008; Al-Sadi et al, 2012; Al-Balushi et al, 2018).…”

Section: Introductionmentioning

confidence: 99%

Aspergillus terreus obtained from mangrove exhibits antagonistic activities against Pythium aphanidermatum-induced damping-off of cucumber

Al-Shibli

Dobretsov

Al-Nabhani

et al. 2019

PeerJ

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A study was conducted to investigate the potential of Aspergillus terreus obtained from Avicennia marina mangrove roots in inhibiting Pythium aphanidermatum and damping-off disease of cucumber. Aspergillus terreus exhibited in vitro inhibition of Pythium aphanidermatum growth. Electron microscope examination revealed that the antagonistic fungal isolate resulted in shrinking and groves in Pythium hypha. When Aspergillus terreus culture filtrate was added to Pythium aphanidermatum, it resulted in a significant increase (by 73%) in electrolyte leakage from Pythium hypha compared to the control, as well as significant reduction (by 71%) in oospore production. The Aspergillus terreus culture was also found to produce a cellulase enzyme, which is suggested to be involved in the antagonism against Pythium aphanidermatum. Adding Aspergillus terreus to soil infested with Pythium aphanidermatum significantly reduced percent mortality in cucumber seedlings by 70%. Aspergillus terreus, when applied alone on cucumber seedlings, did not show any suppressive effects on cucumber growth (length and fresh and dry weight). This appears to be the first report of isolation from mangrove of Aspergillus terreus with antagonistic activity against Pythium aphanidermatum-induced damping-off of cucumber. The study indicates that fungal isolates obtained from marine environments may serve as potential biocontrol agents against some plant pathogens.

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Section: Introductionmentioning

confidence: 99%

Aspergillus terreus obtained from mangrove exhibits antagonistic activities against Pythium aphanidermatum-induced damping-off of cucumber

Al-Shibli

Dobretsov

Al-Nabhani

et al. 2019

PeerJ

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“…It is still effective and there is no evidence to suggest that P. cinnamomi populations are less sensitive to the chemical (Soo et al 1998). The continuing efficacy of multiple applications of metalaxyl to control Phytophthora root rot in pineapple may be because populations of microorganisms which degrade metalaxyl (Al-Sa'di et al 2008) do not build up to high population levels in low pH (pH 4.5-5.6) pineapple soils. Another possible explanation is that enhanced biodegradation of metalaxyl does occur but with the method of application used by growers the pineapple roots take up metalaxyl before it has time to degrade which may in some soils be as short as one to two weeks (Davison and McKay 1999).…”

Section: Treatmentmentioning

confidence: 99%

Phosphonate applied as a pre-plant dip controls Phytophthora cinnamomi root and heart rot in susceptible pineapple hybrids

Anderson¹,

Pegg²,

Scott³

et al. 2011

Australasian Plant Pathol.

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The effectiveness of pre-plant dips of crowns in potassium phosphonate and phosphorous acid was investigated in a systematic manner to develop an effective strategy for the control of root and heart rot diseases caused by Phytophthora cinnamomi in the pineapple hybrids 'MD2' and '73-50' and cultivar Smooth Cayenne. Our results clearly indicate that a high volume spray at planting was much less effective when compared to a preplant dip. 'Smooth Cayenne' was found to be more resistant to heart rot than 'MD2' and '73-50', and 'Smooth Cayenne' to be more responsive to treatment with potassium phosphonate. Based on cumulative heart rot incidence over time 'MD2' was more susceptible to heart rot than '73-50' and was more responsive to an application of phosphorous acid. The highest levels of phosphonate in roots were reached one month after planting and levels declined during the next two months. Pre-plant dipping of crowns prior to planting is highly effective to control root and heart rot in the first few months but is not sufficient to maintain health of the mother plant root system up until plant crop harvest when weather conditions continue to favour infection.

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Epidemiology and Management of Fungal Diseases in Dry Environments

Al-Sadi

2016

Innovations in Dryland Agriculture

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Association of a second phase of mortality in cucumber seedlings with a rapid rate of metalaxyl biodegradation in greenhouse soils

Cited by 15 publications

References 25 publications

Aspergillus terreus obtained from mangrove exhibits antagonistic activities against Pythium aphanidermatum-induced damping-off of cucumber

Aspergillus terreus obtained from mangrove exhibits antagonistic activities against Pythium aphanidermatum-induced damping-off of cucumber

Phosphonate applied as a pre-plant dip controls Phytophthora cinnamomi root and heart rot in susceptible pineapple hybrids

Epidemiology and Management of Fungal Diseases in Dry Environments

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