As I walked the rows of my garden, I noticed that my turnip
leaves were looking ragged. Something
has been chewing away on the turnip greens, which is odd. I’ve never had this problem in
the past. On further investigation, I
discovered many insects hanging out in my little turnip patch. Here I interrogate three turnip eating suspects to determine the guilty pest.
Turnip Eating Suspect #1: Grasshopper Nymph
Grasshoppers will definitely eat leaves, but this
was one small insect so I’m thinking that all the damage wasn’t due to this one
tiny grasshopper.
Turnip Eating Suspect #2: Harlequin Bug
This pretty bug isn’t a gardener’s friend. Harlequin bugs are sap suckers, so I can’t
blame it for all the eaten leaves.
However, these bugs can cause plants to wilt and die due to sap
sucking. Cabbage is one of their
favorite plants along with other Brassicas, including turnips. I found two of these in my turnips, which
isn’t a good sign and may cause problems in the future, but they are not the
ones eating the turnip leaves.
Turnip Eating Suspect #3: Yellowmargined Leaf Beetle
These little beetles look harmless. However, there are a ton of them among the
turnip leaves. This is a non-native
species from South America that has invaded the southeast of the United States. They like to eat the leaves of Brassicas and turnips are their favorite crop!
It appears I have found the guilty suspect.
The next question is what to do about these
yellowmargined leaf beetles. This
website from the University of Florida has some helpful information. For conventional growers, use of insecticides is
effective. For the organic grower, like
me, the prognosis isn’t as good. It is difficult to control their populations without synthetic pesticides. Some
good news is that they are only active during cool weather and become inactive
once the temperature is consistently above 80 F. We’ve had unusually cool weather the last week, but it is warming up, so hopefully they won’t do too much more damage.
The spined soldier bug is a predator of the yellowmargined
leaf beetles. Unfortunately I did not
see any among my turnips, yet. Maybe
reinforcements are on their way! In the
meantime, I will use my tedious pest management technique: a jar of soapy
water, my hands and the time to pick off the little bugs. I know it will be impossible to get every
individual, but hopefully if I can put a dent in their population then my
turnips can grow and survive.
Argh! It's so annoying when you see such beautiful greens getting chewed up. I was out yesterday taking photos and noticed that my turnip leaves are getting chewed up as well, but I have a feeling that the likely culprit in my case is slugs. Not too much damage so far and I'm hoping that a liberal application of diatomaceous earth keeps it that way. Fingers crossed that a bit of hot weather makes dealing with those beetles easier!
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