QUIZ – Insect thresholds

Mix and match quiz! Four questions on spray thresholds for four insects found munching canola plants and pods this week – in some fields.

1. What is the threshold for bertha armyworm?

Bertha armyworm

8-12 per square metre

20-30 per 10 sweeps is suitable for good growing conditions

Varies with spray cost and canola value. At $20 total spray cost and $15 canola, the threshold is 23 larvae per square metre

200-300 larvae per square metre (20-30 larvae per square foot) at the late flowering or pod stage

2. What is the threshold for diamondback moth larvae?

Diamondback moth larvae

8-12 per square metre

20-30 per 10 sweeps is suitable for good growing conditions

Varies with spray cost and canola value. At $20 total spray cost and $15 canola, the threshold is 23 larvae per square metre

200-300 larvae per square metre (20-30 larvae per square foot) at the late flowering or pod stage

3. What is the threshold for grasshoppers?

Migratory grasshopper; Credit Shelley Barkley

8-12 per square metre

20-30 per 10 sweeps is suitable for good growing conditions

Varies with spray cost and canola value. At $20 total spray cost and $15 canola, the threshold is 23 larvae per square metre

200-300 larvae per square metre (20-30 larvae per square foot) at the late flowering or pod stage

4. What is the threshold for lygus bugs?

Lygus bug feeding on a canola pod.

8-12 per square metre

20-30 per 10 sweeps is suitable for good growing conditions

Varies with spray cost and canola value. At $20 total spray cost and $15 canola, the threshold is 23 larvae per square metre

200-300 larvae per square metre (20-30 larvae per square foot) at the late flowering or pod stage

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