Partial Resistance to Potato Black Dot, Caused by Colletotrichum coccodes in Solanum tuberosum Group Andigena

Nitzan, Nadav; Quick, Richard A.; Hutson, Will D.; Bamberg, John; Brown, Chuck

doi:10.1007/s12230-010-9155-2

Cited by 7 publications

(4 citation statements)

References 21 publications

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“…Nitzan et al . () investigating stem and stolon resistance to C. coccodes found no correlation between stem and stolon resistance and speculated that they were controlled by different genes. The monitoring of disease progression on underground parts during the growing season has shown that various disease control methods (cultivar resistance, treatment with azoxystrobin and reduced irrigation), whilst being effective in reducing the development of disease on tubers, do not impact on disease development on stems, stolons and roots in the same way and disease on these plant parts cannot be used as a predictor of likely disease development on tubers.…”

Section: Discussionmentioning

confidence: 99%

Factors affecting the development and control of black dot on potato tubers

et al. 2014

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Field trials were carried out over a 4 year period (2004)(2005)(2006)(2007) to determine the effect of agronomic factors, specifically cultivar resistance, irrigation, crop duration and chemical control (in-furrow application of azoxystrobin), on black dot development on potato tubers grown in fields where soilborne inoculum of Colletotrichum coccodes was present. In 2004In , 2005In and 2006, two field trials were performed each year and in 2007, 19 mini-field trials were carried out across Scotland and England. Cultivar resistance was clearly demonstrated to be an effective method of reducing black dot disease severity on tubers (described here as the percentage of unmarketable tubers, i.e. those with symptoms covering a surface area of >10%). In the four field trials carried out in 2004 and 2005, in irrigated and fungicide-untreated plots, 43Á8% of tubers of cv. Maris Piper were unmarketable, compared with 17Á0% of tubers of cv. Sante. Assessments of disease development on underground plant parts (stems, stolons and roots) revealed that cultivar resistance acted only at the tuber level, as disease symptoms on other parts were often high irrespective of published disease resistance ratings. Irrigation increased the severity of disease on tubers in two trials (England 2004 and 2006), but its effect was less significant when rainfall was high. Delaying harvest by 2 weeks increased disease severity in all six trials, whilst application of azoxystrobin consistently reduced black dot severity. There were significant interactions between factors. The results clearly show how black dot disease severity can be reduced through an integrated approach to disease management.

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Section: Discussionmentioning

confidence: 99%

Factors affecting the development and control of black dot on potato tubers

et al. 2014

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“…Besides, our SCOPUS search did not find the paper of Damm et al [20] as a result. In addition, C. coccodes is another species reported in Colombia, Ecuador, and Peru [26]. However, there are no sequences available in the GenBank with which to confirm the identity of this species.…”

Section: Species Complexes Of Colletotrichum Associated With Crops In...mentioning

confidence: 99%

“…Even though Colombian researchers have tried to address this issue, more taxonomic work must be performed in the northern South American region to describe the diversity of the genus in this region. In addition, C. coccodes is another species reported in Colombia, Ecuador, and Peru [26]. However, there are no sequences available in the GenBank with which to confirm the identity of this species.…”

Section: Species Complexes Of Colletotrichum Associated With Crops In...mentioning

confidence: 99%

Colletotrichum Species Complexes Associated with Crops in Northern South America: A Review

et al. 2022

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Colletotrichum genus comprises a high number of plant pathogens causing anthracnose disease in different tropical and non-tropical crops. We aimed to review northern South American studies in the online SCOPUS database to: create a taxonomically updated list of the species complexes found in the region, describe their most important phytopathological characteristics, revise the methods used in the region to control disease, and discuss the role of fungus as a plant endophyte. A total of 19 Colletotrichum species within five complexes—acutatum, boninense, gigasporum, gloeosporioides, and orbiculare—have been reported in northern South America. Few studies have been conducted, particularly in Peru and Ecuador, despite the diversity of Colletotrichum hosts cultivated in the region. Important information can be extracted from our review: species do not appear to show host specificity, although some isolates show host preferences, certain plant species can host several Colletotrichum species, some studies show the importance of using plant extracts to control the disease, but biological control using microorganisms is certainly an open area of research in the region. In northern South America, only a few hosts have been reported to harbor Colletotrichum as endophyte, and the potential of these endophytes as biological control agents has not yet been explored.

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“…Stem segments (1cm) were removed aseptically with 2, 6, 10 and 14 cm away above ground. The stem segments were transferred onto modified PDA (Nitzan et al, 2010) and were incubated in the dark at 25 °C. Fungal growth was visible on the agar after 10 days, then, fungal presence was recorded according to Nitzan et al (2009 and where 0 = absent, and 1 = present.…”

Section: Disease Assessmentmentioning

confidence: 99%

First Record of Black Dot Disease Caused by Colletotrichum coccodes on Potato Plants in Egypt

El-Marzoky

2013

Egyptian Journal of Phytopathology

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lack dot is an important disease of potato that affects all plant parts. The disease was observed for the first time at Salhiya and Abo Swair locations in potato fields irrigated with pivot system during 2009/2010 season. Therefore, this study was initiated to investigate the ability of black dot disease to develop and spread on potato plants grown under Egyptian field conditions. Six fungal isolates were identified as Colletotrichum coccodes ((Wallr.) S. Hughes), obtained from two locations in Ismailia Governorate. Pathogenicity tests with the six isolates indicate that isolate CCS-3 was the most virulent one, recorded 100 % wilt of potato plants, while isolate CCA-3 was the weakest one recorded 50.4%. The virulent isolate CCS-3 showed the highest number of sclerotia compared with other isolates. The optimum growth temperature for C. coccodes isolates was 30 o C. At low temperatures (5 to 10 °C), the fungal growth was very limited after 8 to 14 days of incubation. Number of acervuli or sclerotia was observed during the first 8 days of incubations at 5, 10, 15 and 20°C. Abundant acervuli and sclerotia were formed during 20-30 days after incubation at 15 to 20 °C. The sensitivity of C. coccodes to eight fungicides in vitro revealed that the fungicides Octave WP, Euparen M50% and Switch M were the most effective ones as no fungal growth was observed at all tested concentrations. The survival percentage of C. coccodes sclerotia decreased above soil surface as compared to those burred below soil surface at 10 and 20 cm depth during June 2010 till June 2011. The obtained results indicate that sclerotium was able to survive in soil for at least one year. This is the first report of black dot disease caused by C. coccodes in Egypt.

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Partial Resistance to Potato Black Dot, Caused by Colletotrichum coccodes in Solanum tuberosum Group Andigena

Cited by 7 publications

References 21 publications

Factors affecting the development and control of black dot on potato tubers

Factors affecting the development and control of black dot on potato tubers

Colletotrichum Species Complexes Associated with Crops in Northern South America: A Review

First Record of Black Dot Disease Caused by Colletotrichum coccodes on Potato Plants in Egypt

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