Science into practice - Ornamentals disease control

CP 124: Managing Ornamental Plants Sustainably (MOPS)

New chemical and biological plant-protection products have been identified as having potential to help disease control for ornamental plant production.

This three-year AHDB-funded programme was designed to generate information about which chemical and biological plant-protection products are most effective against a range of pests and diseases.

It aimed to test novel chemical and biological products compatible with integrated crop-protection strategies to help growers make rational decisions about when and how to use them. Powdery mildew and rust were two of the key diseases examined.

Three novel chemical fungicides, including one that is now approved as Reflect (isopyrazam) and available for use on ornamentals under EAMU 1602/2016, performed well against both powdery mildew and rust diseases.

Takumi and another novel chemical products performed well against powdery mildew, while Serenade ASO (Bacillus subtilis) and two novel biofungicides had broad-spectrum activity against both powdery mildew and rust. One of the novel biofungicides based on a plant extract performed consistently well in managed programmes for powdery mildew.

Trials also indicate that there is considerable scope to integrate chemical fungicides with biopesticides to maintain effective control of powdery mildew, while scaling back on chemical products and reducing the risk of the pathogen developing resistance.

On-label or EAMU authorisations are now being sought on the products that showed the most promise.

MOPS ran from January 2014 to March 2017 and further information can be found online at horticulture.ahdb.org.uk.


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