Pseudomonas fluorescens

Biological insecticide


Pseudomonadales: Pseudomonadaceae

Approved name:

Pseudomonos fluorescens (Trevisan) Migula.


A naturally and widely occurring bacterium. A strain that was naturally non-ice nucleating was originally isolated and registered in the USA for suppression of frost damage to fruit crops. Other strains with anti-fungal or anti-bacterial activity have been isolated and commercialized in the USA and India


Produced byfermentation.


Soil-borne diseases caused by  Fusarium and Rhizoctonia spp..


Fruit tree crops, particularly pears and apples, cotton and vegetables.


Mode of action:

Bacteria and fungal propagules on the leaves of crops often serve as nucleationsites for ice formation and ice crystals often form when they are present and the temperature falls below freezing, with resulting damage to the leaf.If these are replaced on plant leaves with competitive antagonists that lack the ice-nucleating protein, frost is prevented, even at temperatures as low as -5 °C. Other strains of Pseudomonos fluorescens are antagonistic to foliar or rhizosphere bacteria and fungi through the production of siderophores and antibiotics.



Sold as seed treatments or WPs of bacterial spores.


Soil-borne pathogens are controlled with the use of seed treatments or hopper-box applications and foliar pathogens by spray applications. Fire blight sprays should be applied before flowering. Apply non-nucleating bacteria to foliage of tree crops and vegetables before the temperature falls below freezing. A single application will protect from frost damage to temperatures as low as -5 °C for up to two months. The bacterium must be established on the foliage before freezing temperatures occur.


Storage conditions:

Store in a cool, dry place in a sealed container. Do not expose to extremes of temperature or direct sunlight.


If stored under recommended conditions, the product remains viable for a year.


It is unusual to apply fluorescenswith other chemical treatments.


There are no records of allergic or other adverse effects following use of fluorescens. It is regarded as being of low mammalian toxicity.


P. fluorescens. occurs widely in nature and is not expected to have any adverse effects on non-target organisms.


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