Ultimately, Beneficial Fungi could be more Effective than Pesticides against Nematodes

Feb 08, 2021

Over the past 30 years, the use of soil fumigants and nematicides used to protect cole crops, such as broccoli and Brussel sprouts, against cyst nematode pathogens in coastal California fields has decreased dramatically. A survey of field samples in 2016 indicated the nematode population has also decreased, suggesting the existence of a natural cyst nematode controlling process in these fields.

Thanks to California's pesticide-use reporting program, nematologists have been able to follow the amounts of fumigants and nematicides used to control cyst nematodes over the past three decades. "Application of these pesticides steadily declined until they were completely eliminated in 2014 while, for example, broccoli yields continued to increase each year," said Ole Becker, a scientist with the Department of Nematology at the University of California.

In a study of 152 fields, Borneman, Becker and colleagues detected cyst nematodes in about 38% of them. Only a few of these fields had enough nematodes to potentially damage the crops. This showed that growers had likely reduced their usage of nematicides because of a natural decline in the nematode populations.

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