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Transfer and Development of Pasteuria penetrans.

G M Kariuki¹, D W Dickson

¹Post Doctoral Research Scientist and Former Graduate Student, and Professor, Entomology and Nematology Department, Institute of Food and Agricultural Sciences, University of Florida, Gainesville, FL 32611-0620.

Journal of Nematology

|March 5, 2009

Summary

This study shows Pasteuria penetrans can suppress peanut root-knot nematodes in new locations. Soil fumigants like 1,3-dichloropropene did not harm P. penetrans, but chloropicrin did, impacting nematode control.

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Area of Science:

Agricultural Science
Nematology
Microbial Ecology

Background:

Pasteuria penetrans isolate P-20 is linked to soil suppressiveness against peanut root-knot nematodes in Florida.
Understanding the bacterium's establishment and efficacy in new environments is crucial for biological control strategies.

Purpose of the Study:

To investigate the successful transfer and establishment of P. penetrans from a suppressive to a new soil environment.
To evaluate the impact of soil fumigants (1,3-dichloropropene and chloropicrin) on P. penetrans populations and their efficacy against nematodes.

Main Methods:

Transferring P. penetrans to a new site and establishing it using susceptible host plants over different seasons.
Applying two soil fumigants, 1,3-dichloropropene (1,3-D) and chloropicrin, to treated plots.
Assessing P. penetrans infection levels in nematodes (J2) and adult females, and quantifying nematode populations post-treatment.

Main Results:

P. penetrans successfully established in the new site, demonstrating its transferability.
1,3-dichloropropene (1,3-D) did not adversely affect P. penetrans, while chloropicrin negatively impacted its populations.
Nematode suppression was highest in non-fumigated and 1,3-D-fumigated plots, with chloropicrin treatment resulting in the highest J2 numbers.

Conclusions:

Pasteuria penetrans can be effectively transferred and established in new locations to achieve suppressive densities against peanut root-knot nematodes.
Soil fumigant choice is critical; 1,3-D appears compatible with P. penetrans, whereas chloropicrin is detrimental to its efficacy.