Question of the Week: Cross-Striped Cabbageworm

Last week the question was:  What kind of caterpillars are these on this broccoli leaf?  (Hint:  They hatched from eggs that were laid in a cluster rather than singly.)

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These are early instar cross-striped cabbageworms.  Their eggs are deposited in clusters of 20-30 as opposed to most other brassica eating caterpillars which deposit their eggs one at a time.  Cross-striped cabbageworms can devastate a crop quickly because of their numbers.  Here is a broccoli leaf that has been destroyed by these guys.

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Here is this weeks question:  What is this weed?

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