pinch open to zoom in
- Uncap any suspect cells.
- Hold the frame by the lugs at either end of the top bar and turn it upside down.
- Position the sun or a source of artificial light behind you so that it shines into the cells.
- Manipulate the frame up and down so that you can clearly see the base or the content of the cells.
- Search the lower walls of the cells for a distinctive curved shape which resembles the rounded end of a bullet and is identical to the head end of a sunken, moist, diseased larva and pupae.
- Look for the thin hair like structure that is the remains of the tongue in pupal scale.
The red stick in the photo below is inserted in a cell and shows the correct angle between eye and frame.