I was admiring how well the onions were swelling the other day, suddenly I noticed some of the leaves had been chewed in a neat circular way. Something had completely sliced open the tips of the leaves (bulbs are fine), so I did a bit of investigating to see what it could be. It didn’t take long to find the culprits way down inside the hollow leaves, complete with lots of green poop. Nice.
After a bit of research it appears the podgy caterpillars I found inside my onion leaves are cutworms. Cutworms are the larvae of several species of night flying moths, they’re not actually worms at all. Apparently, they’re a common visitor to the vegetable garden but I’ve never noticed them before.
They hide in soil or under leaf litter, feeding on crops and other plants at night (more common early in the year), often cutting young plants or seedlings straight down to ground level. I guess that’s how they get their rather cruel name. When alarmed they curl into a C-shape, my personal observation is they have very sticky feet, making them difficult to pick off plants. They’re large and meaty so I didn’t fancy squishing them (I’m useless at killing things anyway), they’d make a heck of a mess. I simply moved on the ones I found and did a bit of hoeing to see if I could spot any lurking in the soil.
Gardening organically and living where I do I’m always going to have the odd ‘pest’ problem here and there, that’s how it goes. I don’t use nasty chemical sprays, my preferred method of natural control will be to keep a close eye for more, picking them off if I see them, digging the onion bed over after harvesting to expose any I may have missed. Cutworms have many natural predators including wild birds, our chickens will scratch in the onion bed later on in the year too.
Cutworms, your days are numbered.