What's Eating My Raspberries?
Raspberry trouble comes in two flavors: leaf damage you can see across the yard, and fruit damage you don't find until picking. One newer arrival is worth knowing by name.
The usual suspects
Japanese beetles
The signs: Upper leaves skeletonized to lace in broad daylight; beetles clustered on sun-side canes and ripe fruit.
What it looks like: Metallic green with copper wings, feeding in groups.
What to do: Morning shake-down into soapy water, daily during peak flight. Netting the patch during beetle season protects fruit and foliage both.
Spotted wing drosophila
The signs: Ripe berries collapse soft and leaky a day after picking; inside, tiny white larvae. Fruit on the cane weeps juice from pinpricks.
What it looks like: A small fruit fly that — unlike its vinegar-fly cousins — lays into sound, ripening fruit; males carry one dark wing spot.
What to do: Pick early, pick often, refrigerate immediately, and strip every overripe berry from the patch — sanitation breaks the cycle. Fine mesh (not bird net) excludes them in small plantings.
Raspberry cane borer
The signs: The top six inches of a cane wilts and blackens suddenly; below the wilt, two neat rings girdle the stem.
What it looks like: The rings are egg-laying scars of a slim black-and-yellow longhorn beetle; the grub tunnels down the cane afterward.
What to do: Prune the wilted tip a few inches below the lower ring and burn or trash it — do this promptly and the patch stays clean.
Raspberry sawfly larvae
The signs: Leaves eaten to a fine skeleton network from below, spring into early summer.
What it looks like: Small pale spiny larvae on leaf undersides.
What to do: Handpick or spot-spray insecticidal soap; vigorous plantings outgrow moderate grazing.
Birds
The signs: Berries plucked whole or pecked, the highest and ripest first.
What it looks like: Dawn and dusk raids.
What to do: Netting over a frame at first blush; harvest promptly.
When it's not a pest at all
Canes that fruited this year die on schedule — that's how raspberries work; cut spent floricanes at the base. Orange powder on leaf undersides is rust; gray fuzz on fruit is Botrytis. Neither chews.
Or just point your phone at it
Snap a photo of the leaf, the bug, or the droppings, and Harold — the advisor built into Homestead Paradise — names what he sees, tells you friend or foe, and what he'd do next. Honest when he's unsure, and careful where it counts.
Put Harold's Eyes on it — free 14-day trial