Subjects affecting diffuse knapweed (Centaurea diffusa)
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    Seed, Cone, Flower, Bud and Fruit Damaging Insects (4)
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Image Subject Name Scientific Name Description
0021059 bronze knapweed root borer Sphenoptera jugoslavica in root
0021054 gall flies Urophora spp.
0021057 bronze knapweed root borer Sphenoptera jugoslavica
5435699 broad-nosed knapweed seedhead weevil Bangasternus fausti egg below flower head
0022029 bronze knapweed root borer Sphenoptera jugoslavica on seed head
0022028 bronze knapweed root borer Sphenoptera jugoslavica
0021058 bronze knapweed root borer Sphenoptera jugoslavica on flower
5435701 lesser knapweed flower weevil Larinus minutus emergence hole of L. minutus.
5435698 broad-nosed knapweed seedhead weevil Bangasternus fausti adult weevil
5435697 broad-nosed knapweed seedhead weevil Bangasternus fausti adult weevil
5435702 lesser knapweed flower weevil Larinus minutus pupa
5435700 lesser knapweed flower weevil Larinus minutus Above is adult Larinus minutus, below is Bangasternus fausti - for comparison.
5435755 lesser knapweed flower weevil Larinus minutus plant heavily attacked by adult weevils
5435756 lesser knapweed flower weevil Larinus minutus lightly attacked plant (L) heavily attacked plant (R) by adult seed weevils
5435758 lesser knapweed flower weevil Larinus minutus Tygh Valley OR site in 2007, plant reduction over 90%
5435704 lesser knapweed flower weevil Larinus minutus adult weevil
5435746 brown-winged knapweed moth Pterolonche inspersa Pterolonche inspersa larva (L) usually occurs below the gall by Sphenoptera jugoslavica (R)
5435747 brown-winged knapweed moth Pterolonche inspersa eggs may be laid on leaf surface or on leaf stalk, they are kidney bean-shaped and have a dimple in center.
5435748 brown-winged knapweed moth Pterolonche inspersa larva
5435749 brown-winged knapweed moth Pterolonche inspersa larva in root gall
5435750 bronze knapweed root borer Sphenoptera jugoslavica eggs laid at base of rosette. Blueish eggs have not hatched yet, white ones have, note frass from larvae boring into root crown.
5435751 bronze knapweed root borer Sphenoptera jugoslavica larva in root gall
5435752 bronze knapweed root borer Sphenoptera jugoslavica adult
5435753 bronze knapweed root borer Sphenoptera jugoslavica adult
5435754 bronze knapweed root borer Sphenoptera jugoslavica adult
5358611 UV knapweed seedhead fly Urophora quadrifasciata Female seedhead gall fly (Urophora quadrifasciata), a biological control agent of diffuse knapweed (Centaurea diffusa), on a knapweed flower bud.

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