Pythium and Phytophthora species associated with root and stem rots of kalanchoe

Watanabe, H.; Taguchi, Yoshihiro; Hyakumachi, Mitsuro; Kageyama, Koji

doi:10.1007/s10327-006-0338-0

Cited by 28 publications

(16 citation statements)

References 15 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In the USA, it was found that P. helicoides was virulent in several crops such as bell pepper and caused root and stem rot of Begonia (Chellemi et al 2000;Yang et al 2013). In Japan, the species was identified to infect miniature r o s e , a n d t o c a u s e r o o t a n d s t e m r o t o f Chrysanthemum and Kalanchoe (Kageyama et al 2002;Tsukiboshi et al 2007;Watanabe et al 2007). The disease transmission test on miniature roses showed that the disease spread throughout the bench 10 days post-inoculation of the plants placed in the bench center (Kageyama et al 2002).…”

Section: Introductionmentioning

confidence: 98%

Identification and characterization of Phytopythium helicoides causing stem rot of Shatangju mandarin seedlings in China

et al. 2016

View full text Add to dashboard Cite

Citrus mandarin (Citrus reticulata) cultivar Shatangju has great economic importance in southern China because of its delicious fruit and medicinal peel. During surveys conducted in 2012 and 2013, stem rot and plant death were observed on 2-to 3-year-old Shatangju grafted seedlings in 21 nurseries located in three regions (Yangjiang City, Sihui City and Deqing County) of Guangdong Province, China. The aims of this study were to characterize the symptoms of seedling stem rot and death; evaluate the incidence and loss; identify the causal agent and evaluate its pathogenicity. The disease was present in all surveyed nurseries but incidence varied with location. A Pythium-like oomycete was consistently obtained from symptomatic plants collected in the nurseries surveyed. On the basis of morphological and cultural characteristics and combined phylogenetic analysis of three DNA sequences including the internal transcribed spacer region (ITS), mitochondrial CoxI and CoxII genes, 21 of the isolates obtained were identified as belonging to the species Phytopythium helicoides. The isolates were pathogenic to the scions but not rootstocks of Shatangju mandarin seedlings cultivated in a controlled greenhouse and symptoms identical to that observed in the field were reproduced. The pathogen was re-isolated consistently from the inoculated plants, confirming Koch's postulates. Seedling stem rot and eventual death caused by P. helicoides represents a serious threat to Shatangju mandarin nursery productivity and longevity in southern China.

show abstract

Section: Introductionmentioning

confidence: 98%

Identification and characterization of Phytopythium helicoides causing stem rot of Shatangju mandarin seedlings in China

et al. 2016

View full text Add to dashboard Cite

show abstract

“…Pythium root rot continually threatens the productivity of several types of crops including cucumbers, sweet peppers, tomatoes, lettuce, spinach, roses, and chrysanthemums (Sutton et al, 2006). The principal causal agent of rose root rot disease is P. helicoides (Kageyama et al, 2002;Watanabe et al, 2007). The root rot disease has also been observed in rockwool cultures of cutting rose and has spread in Japan.…”

Section: Discussionmentioning

confidence: 99%

Suppressive effects of a polymer sodium silicate solution on powdery mildew and root rot diseases of miniature rose

Elsharkawy¹,

Hase²,

Shimizu³

et al. 2015

Afr. J. Biotechnol.

View full text Add to dashboard Cite

Sodium silicate was dissolved in water in either a monomer form or polymer form; the effects of both forms of sodium silicate aqueous solution on rose powdery mildew and root rot diseases of miniature rose were examined. Both forms of sodium silicate aqueous solution were applied to the roots of the miniature rose. Potassium silicate aqueous solution was used as a control and was compared to the effect of sodium silicate aqueous solution. The polymer sodium silicate aqueous solution was the most effective treatment against both powdery mildew and root rot diseases. Moreover, no inhibition effects of silicate solutions were observed in vitro on Pythium helicoides, the causal pathogen of rose root rot disease. The silicon contents in the roots of the miniature rose treated with polymer sodium silicate were significantly greater than that in plants treated with monomer sodium silicate. In conclusion, the suppressive effects of sodium silicate in the polymer form were confirmed against powdery mildew and root rot diseases of the miniature rose.

show abstract

“…The root rot disease of rose and kalanchoe caused by P. helicoides is most severe at temperatures higher than 35°C (Kageyama et al 2002;Watanabe et al 2007), and in fact the disease is prevalent in summer. However, zoospore formation in P. helicoides is induced at 25-30°C (Kageyama et al 2002).…”

Section: Discussionmentioning

confidence: 99%

“…(Kageyama et al 2002(Kageyama et al , 2003Watanabe et al 2007). The pathogen also affects cutting roses grown in rock wool culture, a hydroponic culture system in which the nutrient solution is recirculated.…”

Section: Introductionmentioning

confidence: 99%

Bait method to detect Pythium species that grow at high temperatures in hydroponic solutions

et al. 2008

Self Cite

View full text Add to dashboard Cite

Pythium helicoides, P. aphanidermatum and P. myriotylum are important pathogens that cause root rot of several crops in hydroponic culture and in ebb-and-flow irrigation systems. These species belong to a group of Pythium species that can grow at temperatures higher than 40°C. We developed a method for baiting these high-temperature Pythium species and evaluated its practicality to monitor their presence in nutrient solutions. Seeds of cucumber, tomato, radish, hemp, perilla and millet and leaves of bent grass and rose were tested as baits in hydroponic systems. Hemp, perilla and radish seeds and bent grass and rose leaves were more effective than the other baits for Pythium zoospores, and bent grass leaves were the most effective. In a sensitivity test, bent grass leaf traps (BLTs) detected three Pythium species after only a 1 day exposure to suspensions of 40 zoospores per liter of water, and the frequency of detection increased with zoospore density and with baiting period. A temperature of 38°C was optimum for the selective reisolation of the high-temperature Pythium species from the BLTs. The BLT was also tested with inoculated and noninoculated miniature roses that shared a recirculating nutrient solution. The pathogen was detected in the nutrient solution 23 days before the disease spread to the noninoculated roses. In addition, P. helicoides was detected 30 days before the disease was evident in a commercial greenhouse. The baiting method described here will be useful for monitoring high-temperature Pythium species in recirculating hydroponic culture systems.

show abstract

Pythium and Phytophthora species associated with root and stem rots of kalanchoe

Cited by 28 publications

References 15 publications

Identification and characterization of Phytopythium helicoides causing stem rot of Shatangju mandarin seedlings in China

Identification and characterization of Phytopythium helicoides causing stem rot of Shatangju mandarin seedlings in China

Suppressive effects of a polymer sodium silicate solution on powdery mildew and root rot diseases of miniature rose

Bait method to detect Pythium species that grow at high temperatures in hydroponic solutions

Contact Info

Product

Resources

About