Infestation of garden by unknown insects

Asked December 11, 2019, 12:44 PM EST

Hi I have a question. I am new to gardening and had garden beds installed this past fall. We planted a variety of crops at the end of summer - bok choy, lettuce, shallots, broccoli and they all seem to be doing splendidly. However we have noticed in the past few weeks that our bok choy looks like it is being eaten. After a heavy rain last weekend I noticed all these yellow looking worms all over the leaves. i know they are alive because I picked a few off and they would wiggle around. I talked to someone at the Portland Nursery and showed them pictures but they couldn't figure out what they were. They recommended the leaf damage might be due to slugs so I did apply Sluggo. I managed to rinse off most of these worms, but last night after another round of rain they appear to be back in force. I am not sure where to go next. I was wondering if you can help identify what these might be and how to get rid of them. I have attached a picture of one of my bok choy leaves with these insects from this morning.

Multnomah County Oregon

1 Response

The insect photos and leaf holes don’t give enough detail for me to identify the pest. Is it possible to bring them to the Master Gardener Volunteers for identifying? Contact information:
Here is a quote from a publication, Fall and Winter Gardening in the Pacific Northwest, “Fall plantings tend to have few insect problems, as they avoid the peak insect activity of midsummer. However, some insects, such as cabbage worms and cabbage root maggots, may be worse late in the year. Row covers and cloches help deter insects as well as extend the season.”
Growing Your Own publication includes information about pest control you may find generally helpful.