# Blackberry Knot Gall Wasp (*Diastrophus nebulosus*) The Blackberry Knot Gall Wasp is a tiny insect that makes special galls on blackberry plants. These galls look like little bumps and are homes for the wasp's babies. They help the plant grow in a unique way! - **Category:** [Insects](https://www.snappit.app/explore/categories/insect) - **Rarity:** Common - **Danger:** 1/5 · Very low - **Snaps:** 1 - **Habitat:** Forests ![Blackberry Knot Gall Wasp](https://commons.wikimedia.org/w/index.php?title=Special:Redirect/file/Diastrophus_nebulosus._adults._gall.jpg&width=800) Photo: Beatriz Moisset, CC BY-SA 4.0 · [Wikimedia Commons](https://commons.wikimedia.org/wiki/File:Diastrophus_nebulosus._adults._gall.jpg) ## Appearance The Blackberry Knot Gall Wasp is a tiny, dark brown to black insect, typically only a few millimeters long. It has clear wings and a somewhat stout body, making it appear compact and robust compared to many other wasps. It's often found near the distinctive bumpy galls it creates on blackberry stems. ## Taxonomy - **Kingdom:** Animalia - **Phylum:** Arthropoda - **Class:** Insecta - **Order:** Hymenoptera - **Family:** Cynipidae - **Genus:** Diastrophus ## Interesting facts - Adult wasps are so tiny, they are often mistaken for flies or gnats! - Hundreds of baby wasps can live safely inside just one large gall! - The blackberry plant is tricked into building homes for these tiny insects! - The bumpy 'knot' on blackberry stems is actually a nursery for baby wasps! ## Special abilities - **Gall Architect:** Blackberry Knot Gall Wasp can inject chemicals into blackberry stems that make the plant grow a protective 'knot' around its larvae. - **Hidden Nursery:** Blackberry Knot Gall Wasp has larvae that live safely inside a woody gall, helping them develop without being easily eaten. - **Plant Whisperer:** Blackberry Knot Gall Wasp can make plants change their shape, creating a unique home and food source for its babies. ## Measurements & details - **Size:** 2.5-4 mm - **Lifespan:** 7-20 days - **Leg Count:** 6 ## Diet & Feeding Larvae munch on plant tissue inside their cozy galls, while adults usually don't eat much. - **Age differences:** Larvae feed on plant tissues inside the gall; adults typically do not feed or consume only nectar. - **Primary Foods:** Blackberry stem tissue, Plant sap, Gall tissue - **Foraging Method:** Null ## Ecological connections - **Depends on:** [Allegheny Blackberry](https://www.snappit.app/explore/allegheny-blackberry) (*Rubus allegheniensis*) — Lays eggs in stems and creates galls for larval development. - **Parasitizes:** Gall Wasp Parasitoid (*Torymus advenus*) — Lays eggs inside the Blackberry Knot Gall Wasp larvae within the gall. - **Parasitizes:** Blackberry Gall Wasp Parasitoid (*Eurytoma rubi*) — Its larvae develop by consuming the larvae of the gall wasp. ## Traits - [Solitary](https://www.snappit.app/explore/traits/solitary): Solitary animals live alone for most of their lives, only interacting with others for mating or parental care. - [Herbivorous](https://www.snappit.app/explore/traits/herbivorous): This trait characterizes organisms whose diet consists entirely or primarily of plant material. - [Symbiotic](https://www.snappit.app/explore/traits/symbiotic): Describes a relationship between two different species where they live in close association, often benefiting one or both. - [Forest](https://www.snappit.app/explore/traits/forest): Forest habitats are terrestrial environments dominated by dense tree cover, supporting a high diversity of plant and animal life. - [Keystone Species](https://www.snappit.app/explore/traits/keystone-species): Describes a species whose presence and role have a disproportionately large effect on its environment. - [Miniature](https://www.snappit.app/explore/traits/miniature): Pertaining to species that are significantly smaller than typical or average for their kind. - [Pollinator](https://www.snappit.app/explore/traits/pollinator): Describes organisms that transfer pollen, enabling the fertilization and reproduction of plants. ## Collections - [Insects](https://www.snappit.app/explore/collections/insects) ## Safety **Danger:** 1/5 · Very low Don't touch galls without asking an adult, as some insects can be delicate. ## Frequently Asked Questions ### How to identify Blackberry Knot Gall Wasp? Compare the antennae, wings, waist, body hair and legs. Yellow and black stripes show up on bees, wasps and harmless mimics alike. Bee & Wasp Identifier: upload a photo and compare the visible details. ### How big is Blackberry Knot Gall Wasp? 2.5-4 mm ### How long does Blackberry Knot Gall Wasp live? 7-20 days ### What does Blackberry Knot Gall Wasp eat? Larvae munch on plant tissue inside their cozy galls, while adults usually don't eat much. ### Where is Blackberry Knot Gall Wasp usually found? Forests ### How does Blackberry Knot Gall Wasp hunt? Null ### How many legs does Blackberry Knot Gall Wasp have? 6 ## Where to spot - [Conestee Nature Preserve](https://www.snappit.app/guides/places/conestee-nature-preserve) — South Carolina, US · Nature Reserve ## More Insects - [Common Eastern Bumble Bee](https://www.snappit.app/explore/common-eastern-bumble-bee) (*Bombus impatiens*) - [Spotted Lanternfly](https://www.snappit.app/explore/spotted-lanternfly) (*Lycorma delicatula*) - [Brown-belted Bumble Bee](https://www.snappit.app/explore/brown-belted-bumble-bee) (*Bombus griseocollis*) - [Eastern Carpenter Bee](https://www.snappit.app/explore/eastern-carpenter-bee) (*Xylocopa virginica*) --- Source: [Blackberry Knot Gall Wasp: Facts & Places to See — Snappit](https://www.snappit.app/explore/blackberry-knot-gall-wasp)