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level: Level 1

Questions and Answers List

level questions: Level 1

QuestionAnswer
What disease is predominantly seedborne in OSRAlternaria
What is the final date of application of Kerb?31st January
What are the optimum conditions for Clubroot spread?16-18 degrees, wet poorly drained acidic soils
What active can be used on clearfield rape to control volunteer rape and charlock/runchImazamox
What is the target GAI at flowering?3.5
How long can Clubroot inoculum remain viable in the soil for?20 years
What are the optimum conditions for light leaf spot sporulation and spread?8 degrees and above with free water for 12 hours
What is the strongest fungicide for LLS?Prothioconazole
What are the favored conditions for Phoma developmentLate drilled, mild and wet weather
The sclerotia produced by Sclerotinia stem rot in oilseed rape may remain viable in the soil for7-10 years
Where can Sclerotinia inoculum be found?Soil
What are the favoured conditions for Sclerotinia?7 degrees and humid
What other combinable crop within the rotation will increase risk of Sclerotinia?Peas
What would be a good fungicide to use as a flowering spray against Sclerotinia?Prothioconazole and Boscalid
When might you apply a further fungicide for Sclerotinia?3 weeks after the first application, if the crop is still flowering
What is the main vector for TUYV in OSR and when is it likely seen?Peach potato aphid in the autumn
What insecticide could be used against MACE and Kdr resistant Peach potato aphids in the autumn?Flonicamid
What insecticide can be used to control pollen beetle, now resistant to pyrethroids?Indoxacarb
What is the threshold for spraying pollen beetle when the OSR crop is less than 30 plants/m2?25/plant
What is the threshold for spraying pollen beetle when the OSR crop is 30 - 50 plants/m2?18/plant
What is the threshold for spraying pollen beetle when the OSR crop is 50 - 70 plants/m2?11/plant
What is the threshold for Phoma in a high resistance to stem canker variety?20%
What is the threshold for Phoma in a low resistance to stem canker variety?10%
What is the threshold for Light Leaf Spot?Spray at first sight
What is the threshold for CSFB adults at 1-2 true leaf stage?25%
What is the threshold for CSFB adults at 2-4 true leaf stage?50%
What variety has genetic resistance to Turnip Yellows Virus?Architect
Where can downy mildew inoculum be found?Hosts, seed and trash
What are high risk conditions for verticillium stem wilt?Warm and dry
What are cultural controls for verticillium stem wilt?Long rotation, min-till, delay drilling
What TGW reduction can be expected through verticillium stem wilt?25%
How long can phoma and stem canker persist on crop debris?1-2 years
What is the likely loss from bad phoma infections?10-20%
What region is worst affected by phoma?SE
What are high risk conditions for phoma?Late drilled, mild and wet
A pest larvae found feeding in OSR stems in December has an orange-brown head. What is it?Rape winter stem weevil
Name a herbicide with an EAMU in OSR for charlock controlBifenox
Contans WG is a biological control for what OSR disease?Sclerotinia
An insecticide product that would give effective control of pollen beetles which exhibit Kdr would be:Indoxacarb
The main vector of TuYV is?Peach potato aphid
An OSR disease which is commonly seed and soil borne is?Alternaria
What is the maximum seed moisture content for desiccating OSR?30%
What fungicides could be applied to control Phoma in OSR?Prothioconazole and Difenconazole
A large black grub with a distinct head capsule, three pairs of chest legs and pro-legs is found eating OSR foliage in a warm autumn. It is a?Turnip sawfly
What moisture % should OSR be stored at?<9%
A pest which is likely to be an economic problem in spring OSR over WOSR is?Mealy cabbage aphid
Which herbicide can be used to control Shepherds purse in OSR?Dimethanamid and Metazachlor
What does the Metazachlor & Quinmerac stewardship entail?Individual and total applications are limited to 750g metazachlor and 250g quinmerac /ha
What are the symptoms of TUYV?Chlorosis of leaves between veins and a red leaf edge
What is the yield loss that can be caused by TUYV?26%
What is the main symptom of a bad pollen beetle infestation?Blinding of stalks
What are high risk factors of Pollen beetle?15 degrees and above, prolonged green bud stage
How should one sample for pollen beetle?Check 10 plants across 30m from headland inwards
What is the threshold for control of cabbage seed weevil?1/ plant in the South, 0.5/ plant in North
What is the threshold for controlling mealy cabbage aphid?13% of plants infested
What variety has high resistance against phoma and clubroot?Croozer
What are the management controls for phoma?Trash removal, early drilling, rotation
What is the management strategy for alternaria?Trash removal, volunteer removal, rotation, certified seed and prothioconazole at flowering
How severe can sclerotinia yield loss be?50%
What are the management controls for clubroot?Soil testing, manage brassica volunteers and weeds, long rotation, improve drainage
What is the threshold for spraying pollen beetle when the OSR crop is >70 plants/m2?7/plant