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