Nothing obscure about these three images. Here are symptoms from three big yield robbers doing their thing in canola fields this week. We tossed in a few other choices to make the quiz just a tad more challenging.

1. What caused this damage?

Bertha armyworm

Blackleg

Boron deficiency

Rapid growth

Sclerotinia stem rot

Thrips

2. What caused this damage?

Bertha armyworm

Blackleg

Boron deficiency

Rapid growth

Sclerotinia stem rot

Thrips

3. What caused this damage?

Bertha armyworm

Blackleg

Boron deficiency

Rapid growth

Sclerotinia stem rot

Thrips

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