Fruit & Vegetable Magazine

Features Production Research
Minor Use Registrations added to Quadris


March 22, 2012
By Syngenta Canada

Topics

March 22, 2012 – Quadris fungicide has received Minor Use Registration for suppression of Alternaria leaf spot (Alternaria brassicae) on cabbage, suppression of blossom blight (Ascochyta spp. and Alternaria spp.) on cumin and suppression of black root rot (Rhizoctonia fragariae) on strawberries.

Quadris is a broad-spectrum, preventative fungicide with systemic properties. Optimum disease control is obtained when Quadris is used as a protective treatment prior to disease establishment.

Cabbage – Alternaria leaf spot can cause losses from spotting lesions on the heads of cabbage, reducing yields and increasing the number of unmarketable heads. Symptoms appear first on the older leaves as small yellowish lesions that expand to resemble a target with concentric light and dark areas. Alternaria leaf spot can quickly spread from the leaves to the heads, with the lesions ranging in size from pinpoint to several centimeters in width.

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Cumin – Blossom blight infected plants show minute, brownish necrotic spots, which later turn a shade of black. Diseased plants fail to produce seeds. If seeds are produced, they remain shriveled, light in weight and dark in colour.

Strawberries – Black root rot on strawberries is a very complex and serious disease. It affects primary feeder and perennial roots of the strawberries. Often symptoms are not evident until a year or two after planting. Infected roots develop black lesions on the surface that eventually extend into the interior tissue, resulting in the entire root becoming black and rotted through. Infected plants typically appear wilted and stunted, particularly around fruiting time when there is greater demand on the roots for water and nutrients. As a result, less fruit is produced from the infected plants. Additionally, plants with black root rot are susceptible to secondary pathogen infections and can be at higher risk of winter injury. Management of black root rot begins with disease avoidance and keeping plants healthy and vigorous from transplanting through to harvest.