Rovral WGPlant Protection Product ComparisonPlant Protection Product ComparisonReport inaccuraciesReport inaccuracies

Rovral WG is a protectant fungicide for use on a range of horticultural and agricultural crops.

 

Consult processors before using on crops intended for processing.

Avoid spray drift onto neighbouring crops, especially oats.

 

Rovral WG is a protectant and contact fungicide for the control of Botrytis cinerea in protected tomatoes, lettuce and strawberries, ornamental pot plants, raspberries, oilseed rape, salad and bulb onions (including B. squamosa , and control of Alternaria brassicae and Alternaria brassicicola , in brassica seed production crops, oilseed rape, Brussels sprout and cauliflower.

Strains of several diseases including Botrytis cinerea resistant to dicarboximide fungicides are known in various crops in the UK.

Where strains of fungi resistant to dicarboximide fungicides (such as iprodione) occur, Rovral WG may not be effective.  In order to minimise the risk of resistance development, Rovral WG should be used in accordance with FRAC resistance management advice for dicarboximide fungicides:

Rovral WG contains a dicarboximide fungicide

To reduce the risk of resistant strains adversely affecting control - Avoid the use of consecutive applications of dicarboximide fungicides whether applied alone or in tank mix. - Restrict applications to those times when Botrytis infection pressure is high. - Maintain regular prolonged times when dicarboximides are not used.

Where resistance is suspected, use Rovral WG in mixture with other fungicides with a different mode of action effective against the same diseases.

 

For the control of Botrytis cinerea, apply Rovral WG at a rate of 67 g per 100 litres of water and apply to run off. Apply Rovral WG from when the second truss is in flower; repeat at 14 day intervals or when conditions favour the spread of Botrytis (such as at trimming or de leafing).

The programme described above helps to reduce the levels of inoculum within the house and hence assists in preventing „ghost spotting“.

A maximum of 5 applications may be made. A minimum spray interval of 14 days must be observed. 

 

For the control of Botrytis cinerea, apply Rovral WG at a rate of 33 g per 100 litres of water. Do not exceed a volume of 1000 litres per hectare (equivalent to a maximum of 0.33 Kg/ha).

As a guide for protected lettuce, newly planted lettuce with three leaves require 5 litres of spray to 22,000 plants. At a later stage of growth, e.g. up to six to eight leaves, 5 litres should treat about 5000 plants. The final spray, before cutting, will require 5 litres of spray to approximately 1100 plants.For outdoor and protected lettuce a maximum of 3 applications may be made. A minimum spray interval of 14 days must be observed between treatments.

For the control of Botrytis cinerea, apply Rovral WG at a rate of 67 g per 100 litres of water. Apply at the onset of disease, then repeat at 21 day intervals as necessary. Apply to the point of run off, ensuring good coverage of the plants. Good tolerance to Rovral WG has been shown by the following pot plant species: Aralia sieboldii Azalea spp. Begonia rex (cv Fireglow) Chrysanthemum (all year round cultivars) Cineraria (Senecio sp.) Croton (Codiaeum sp. cv Bravo) Cyclamen spp. Dracaena sp. (cv Redege) Ficus robusta Fuchsia spp. Hedera minor Hedera major Impatiens parviflora Kalanchoe spp. Neanthe bella Pelargonium sp. Philodendron scandens Pilea cadierei (cv Nana) Poinsettia (Euphorbia pulcherrima) Senecio macroglossus variegatus Sinningia spp. (Gloxinia).

Tolerance of other species should be checked before making large scale applications.

For the control of Botrytis cinerea, apply 1.0 kg of Rovral WG in 2000 litres of water per hectare. Lower volume rates may not be sufficient to give good coverage on dense crops. Ensure thorough blossom coverage from above and from the sides. Directed nozzles and a ruffler bar will help achieve this. The first application should be made at the white bud stage with subsequent treatments at 10–14 day intervals during the flowering period, up to a maximum of four applications per year.

For the control of Botrytis cinerea, apply 1.0 kg of Rovral WG in 1000 litres of water per hectare. A minimum of three sprays over the flowering period is recommended, starting at early flowering and repeating at 14 day intervals. A maximum of 4 sprays may be made per year. A minimum spray interval of 10 days must be observed between treatments.

For the control of Alternaria brassicae and A.brassicicola, spray at the end of flowering at a rate of 0.67 kg Rovral WG in 600 to 1000 litres of water per hectare. A total of 3 applications may be made. A minimum spray interval of 21 days must be observed between treatments. Treated crop must not be used for human or animal consumption.

Apply Rovral WG at a rate of 0.67 kg per hectare. A maximum of 1 spray may be made to each crop. Rovral WG should be applied in 200–400 litres per hectare of water as a fine spray (BCPC category), except where drift is a hazard when a medium spray should be used. Use the higher volume if the crop is very dense. Dark leaf spot and pod spot: Alternaria spp Protectant applications Apply 0.67 kg per hectare Rovral WG between mid flower, i.e. when 20 pods that are 2.5 cm in length have formed on the main raceme, and the end of flowering. Disease onset applications Treat with 0.67 kg per hectare Rovral WG when black pin head spots first appear on the pods. Pod infections are most likely to occur on those crops where Alternaria spp spots can be detected on the uppermost leaves (bracts). Grey mould: Botrytis cinerea When applying a protectant spray of Rovral WG at 0.67 kg per hectare at mid flower for the control of Alternaria spp., application will also control grey mould. Application at the end of flowering will be unsatisfactory.

For the control of Alternaria brassicae and A. brassicicola, apply Rovral WG at 0.67 kg per hectare. A maximum of 3 applications of RovralWG may be made. A programme of applications may be required. The first treatment should be applied at the onset of disease on the foliage. Apply in at least 200–600 litres per hectare of water ensuring good coverage of the plants. A minimum spray interval of 21 days must be observed between treatments.

For the control of leaf spot (Botrytis squamosa) and collar rot (Botrytis cinerea) apply Rovral WG at a rate of 0.67 kg per hectare. A programme of applications is required. Apply in 300–600 litres per hectare of water ensuring good coverage of the foliage.

Over wintered: Treat at monthly intervals starting at the crook stage. A maximum of 4 applications may be made. Spring and summer sown: Treat at 14 day intervals starting at the crook stage. A maximum of 4 applications may be made.

Over wintered: Treat at monthly intervals from the crook stage until January. Further treatments at monthly intervals starting in March may be necessary to control late season infections. A maximum of 4 applications may be made.

 

Mixing and Spraying