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Biological Control of Meloidogyne Incognita by Aspergillus Niger F22 Producing Oxalic Acid

Biological Control of Meloidogyne Incognita by Aspergillus Niger F22 Producing Oxalic Acid

Ja Yeong Jang, Yong Ho Choi, Teak Soo Shin, Tae Hoon Kim, Kee-Sun Shin, Hae Woong Park, Young Ho Kim, Hun Kim, Gyung Ja Choi, Kyoung Soo Jang, Byeongjin Cha, In Seon Kim, Eul Jae Myung, Jin-Cheol Kim

PLoS One. 2016 Jun 3;11(6):e0156230.

PMID: 27258452

Abstract:

Restricted usage of chemical nematicides has led to development of environmentally safe alternatives. A culture filtrate of Aspergillus niger F22 was highly active against Meloidogyne incognita with marked mortality of second-stage juveniles (J2s) and inhibition of egg hatching. The nematicidal component was identified as oxalic acid by organic acid analysis and gas chromatography-mass spectroscopy (GC-MS). Exposure to 2 mmol/L oxalic acid resulted in 100% juvenile mortality at 1 day after treatment and suppressed egg hatching by 95.6% at 7 days after treatment. Oxalic acid showed similar nematicidal activity against M. hapla, but was not highly toxic to Bursaphelenchus xylophilus. The fungus was incubated on solid medium and dried culture was used for preparation of a wettable powder-type (WP) formulation as an active ingredient. Two WP formulations, F22-WP10 (ai 10%) and oxalic acid-WP8 (ai 8%), were prepared using F22 solid culture and oxalic acid. In a field naturally infested with M. incognita, application of a mixture of F22-WP10 + oxalic acid-WP8 at 1,000- and 500-fold dilutions significantly reduced gall formation on the roots of watermelon plants by 58.8 and 70.7%, respectively, compared to the non-treated control. The disease control efficacy of the mixture of F22-WP10 + oxalic acid-WP8 was significantly higher than that of a chemical nematicide, Sunchungtan (ai 30% fosthiazate). These results suggest that A. niger F22 can be used as a microbial nematicide for the control of root-knot nematode disease.

Chemicals Related in the Paper:

Catalog Number	Product Name	Structure	CAS Number	Price
AS25301	Organophosphorus Pesticides 1 - WP			Price
CS353803	Organophosphorus Pesticides - WP			Price

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