Diabrotica undecimpunctata

Diabrotica undecimpunctata
diabrotica

I used to own a shirt covered in green beetles with black spots. Here’s me wearing it back in 2017 (aside: this was taken at our old place, that burned down in the Palisades Fire of 2025. Gah I miss it.) One day someone at work told me that my shirt beetles were Diabrotica, a major agricultural pest. It stuck in my head, because I thought “Diabolical Diabrotica”.

These guys cause damage to crops in the larval and adult stages of their life cycle. Larvae feed on the roots of the emerging plants, and the adult beetles eat the flowers, leaves, stems, and fruits of over fifty different types of crops and wild plants, including corn, peanuts, beans, apples, cherries, clovers, lettuce, potatoes and, yes, cucumbers. The beetles can also spread diseases such as bacterial wilt and mosaic virus.

Who eats them? Wolf spiders!

boring

boring

We offered a beginner’s class at Nature Journal Club today, and thirty people came! After spending an hour learning the basics, everyone wandered off to journal their curiosity. Having just done a training on identifying invasive borer beetles, I was interested to record some data about insect activity on a fallen oak log. Boring? Nope, fascinating!

Apis mellifera

Ceanothus macrocarpa

There was a lot to notice on today’s muddy hike—fungi, spikemosses, roaring creeks, first flowers, gorgeous views. Lots to wonder about too, including why the pollen on the bee’s legs was a darker shade of yellow than the pollen it was collecting.

Paropsisterna m-fuscum

Paropsisterna

Our nature journal group met at Will Rogers State Historic Park to journal the fire recovery. Will Rogers himself loved eucalypts, and many are planted there. I noticed that the epicormic growth and the crown sprouts were all being ravaged, and took a closer look.

Schistocerca nitens

Schistocerca nitens

Reading up on this grasshopper, I learned that it is a problematic invasive species in Hawaii. In 2004, a major swarming event on the island of Nīhoa devastated approximately 90% of the island’s vegetation. Likely introduced to Hawaii several decades ago, it has since spread throughout the archipelago, aided by its ability to fly over 300 miles across open ocean!

That last fact blew my mind. 🤯