The efficacy of nematicidal strainSyncephalastrum racemosum

Abstract

Nematicidal activity using a pure culture of Syncephalastrum racemosum was studied. The results showed that the metabolites of S. racemosum have pretty high nematicidal activity. The nematicidal principles were soluble in water and had high thermal stability. The major acid metabolites extracted from cultures of S. racemosum identified from HPLC were oxalic acid dihydrate and tartaric acid. Soil application with culture filtrate of S. racemosum significantly (P < 0.05) reduced nematode population densities and subsequent root-knot development in tomato compared with the controls.

Testing various biocontrol agents against the root-knot nematode (Meloidogyne incognita) in cucumber plants identifies a combination of Syncephalastrum racemosum and Paecilomyces lilacinus as being most effective

“…In addition, Sun et al (1999) reported that all the isolates of S. racemosum obtained from soil were effective at colonizing eggs of M. incognita. However, the same level of efficacy was not observed at higher densities of the nematode (Sun et al, 2008). On susceptible cucumber plants, less effect of this fungus was observed at higher M. incognita densities compared to lower densities.…”

“…Spore suspension of S. racemosum was inoculated on potato sucrose (PS) liquid medium to a final concentration of 10 7 spores ml À1 (Sun et al, 2008). As described by Huang et al (2014), fermentations were performed in a 30 L fermenter containing the PS liquid medium at 27°C for 42 h, and the cultured filtrate and mycelium were used for next experiment after filtration.…”

“…In numerous countries, P. lilacinus is currently registered for sale to control nematodes (Atkins et al, 2005;Kiewnick et al, 2004). In China, the filamentous fungus Syncephalastrum racemosum has been used as a biological control agent against several nematodes (Sun et al, 1999(Sun et al, , 2008. S. racemosum has been reported to reduce the RKN populations in soils and roots, and this reduction was reflected in the increased cucumber yield (Huang et al, 2014;Sun et al, 2008).…”

“…In China, the filamentous fungus Syncephalastrum racemosum has been used as a biological control agent against several nematodes (Sun et al, 1999(Sun et al, , 2008. S. racemosum has been reported to reduce the RKN populations in soils and roots, and this reduction was reflected in the increased cucumber yield (Huang et al, 2014;Sun et al, 2008). As previously described in detail, the reduction of disease severity caused by S. racemosum may be attributed to the direct parasitism on nematode and the secondary metabolites produced by this strain in the soil (Hashem and Abo-Elyousr, 2011;Sahebani and Hadavi, 2008).…”

Activity against plant pathogenic fungi of Lactobacillus plantarum IMAU10014 isolated from Xinjiang koumiss in China

“…They cause serious losses both in the field and post-harvest, and some may produce mycotoxins (Strange and Scott 2005). Various artificial chemical fungicides have been successfully developed and applied to fields to control fungal diseases (Sun et al 2008). However, because of their huge populations and high frequency of mutation, pathogenic fungi may easily acquire resistance to frequently used fungicides.…”