Agrochemicals suitable for downy mildew control in New Zealand boysenberry production

Walter, Monika; Harris-Virgin, P.; Thomas, W. A.; Tate, G.; Waipara, Nick; Langford, G.

doi:10.1016/j.cropro.2003.09.003

Cited by 15 publications

(10 citation statements)

References 1 publication

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“…The results that were obtained with potassium phosphite in these experiments are similar to those that were previously reported by Rebollar-Alviter et al (2012), in which excellent results were obtained in experiments that were conducted over 2 years in 2 producing regions of Michoacan. Similar data have been reported in New Zealand, indicating that 3 sprayings of potassium phosphite from the flower to fruit stages resulted in an acceptable efficacy for disease control in boysenberry (Walter et al, 2004). Phosphites are compounds that move systemically through the xylem and phloem, so far being the only truly systemic fungicide (Cohen and Coffey, 1986).…”

Section: Effect Of the Treatments On The Downy Mildew Incidence (Drybsupporting

confidence: 63%

“…Meanwhile, Walter et al (2004) evaluated different treatments in boysenberry and found that 2 applications of metalaxyl-M, 3 applications of potassium phosphite, and 3 applications of azoxystrobin, followed by 1 applications of dichlofluanid lowered the disease pressure. In contrast, under high disease pressure, only 3 applications of phosphorous acid produced satisfactory results.…”

Section: Introductionmentioning

confidence: 99%

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Biorational treatments to manage dryberry of blackberry caused by Peronospora sparsa

2015

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Section: Effect Of the Treatments On The Downy Mildew Incidence (Drybsupporting

confidence: 63%

Section: Introductionmentioning

confidence: 99%

Biorational treatments to manage dryberry of blackberry caused by Peronospora sparsa

2015

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“…Synthetic chemical fungicides do not provide adequate control of plant diseases, besides being toxic to the beneficial soil-microbial population and harmful to human and animal health (Chen et al, 2001;Bünemann et al, 2006). Natural plant products are important sources of new agrochemicals that control plant diseases (Walter et al, 2004;Reddy et al, 2009). These agrochemicals are non-phytotoxic, systemic and easily biodegradable (Kagale et al, 2004;Yamunarani et al, 2004).…”

Section: S M Al-wakeel Et Almentioning

confidence: 99%

Coumarin and salicylic acid activate resistance to Macrophomina phaseolina in Helianthus annuus

Al-Wakeel

Gabr

Abuelsoud

et al. 2013

Acta Agronomica Hungarica

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The induction of resistance to charcoal rot disease caused by Macrophomina phaseolina (Tassi) Goidanich in sunflower (Helianthus annuus L.) was studied after seed treatments with coumarin (COU) and salicylic acid (SA) at three different levels (0.3, 1.0 and 3.0 mM). The priming of sunflower seeds with 0.3 mM COU or 1.0 mM SA resulted in decreased disease severity and offered about 50% protection and more than 80% reduction in the length of stem lesions under greenhouse conditions. Both COU and SA treatments induced the accumulation of soluble sugars and phytoalexins, as well as stimulating the activity of β-1,3-glucanase and chitinase.

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“…Therefore, disease control methods need to be applied before the emergence of the infection or at the early stages when the external symptoms may not yet be visible. Some success has been achieved in rose and blackberry (Rubus fruticosus) (OÕNeill et al, 2002), but further efforts are needed to find efficient control methods for downy mildew in Rubus and Rosa species (Aegerter et al, 2002;Walter et al, 2004), since the regular use of fungicides may lead to the development of resistant P. sparsa strains. Resistant plant cultivars would be the best solution to the problem.…”

Section: Introductionmentioning

confidence: 99%

Quantification of downy mildew (Peronospora sparsa) in Rubus species using real-time PCR

et al. 2006

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Downy mildew disease caused by Peronospora sparsa, also known as ÔdryberryÕ disease, is a serious threat to the cultivation of arctic bramble (Rubus arcticus) and boysenberry (Rubus spp. hybrid). A quantitative and sensitive screening method is necessary for the breeding of downy mildew resistant cultivars and for determining efficient disease control methods. A quantitative real-time PCR method using SYBR Ò Green I fluorescent dye was developed for the analysis of P. sparsa in arctic bramble, other Rubus species and roses. Primers were designed to amplify a P. sparsa specific 94-bp fragment from the internal transcribed spacer region (ITS1) and a 140-bp fragment from a conserved region of plant 5.8S ribosomal DNA, which served as an internal control in the samples. Linear amplification from genomic DNA and control plasmids was achieved with both primers, and even 37 fg of P. sparsa conidial DNA was detected. In the samples collected from the field, quantities as low as 0.2 ppm of P. sparsa DNA in plant DNA were detected, thus enabling the diagnosis of weak and latent infections. Arctic bramble cvs Pima, Mespi and Mesma, all showing distinct foliar symptoms, were tested to assess the relative amount of downy mildew DNA present. The symptoms and the amount of P. sparsa DNA detected correlated only in cv. Pima, indicating that visual inspection of symptoms is not a reliable method for assessing the extent of tissue infection. The number of conidiophores of P. sparsa on in vitro inoculated leaves of two arctic bramble cultivars correlated with the results obtained by real-time PCR.Abbreviations: bp -base pair; Ct -threshold cycle; ITS -internal transcribed spacer; rDNA -ribosomal DNA

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Agrochemicals suitable for downy mildew control in New Zealand boysenberry production

Cited by 15 publications

References 1 publication

Biorational treatments to manage dryberry of blackberry caused by Peronospora sparsa

Biorational treatments to manage dryberry of blackberry caused by Peronospora sparsa

Coumarin and salicylic acid activate resistance to Macrophomina phaseolina in Helianthus annuus

Quantification of downy mildew (Peronospora sparsa) in Rubus species using real-time PCR

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