Albert Lea Seed House Oat Production Guide | Page 34
Return to preceding couplet (5’).
antennae not elbowed
snout
no snout
antennae elbowed
Figure 6.1.
Figure 6.2.
6
6’
Head prolonged into a snout,
antennae elbowed (weevil).
Go to couplet 7
Head not prolonged into a snout,
antennae straight without distinct
elbow.
Go to couplet 8
Return to preceding couplet (6).
spots
on
elytra
Round
pits on
pronotum
no
spots
on
elytra
Figure 7.1.
Figure 7.2.
7
7’
34
Four red to brown spots on back
(elytra), pits on pronotum round in shape.
Rice weevil – Sitophilus oryzae
(may be the maize weevil, Sitophilus
zeamais, cannot tell apart by external
features).
Oval pits
on
pronotum
No spots on back (elytra), uniformly dark
brown, pits on pronotum oval in shape.
Granary weevil – Sitophilus granarius