Instructions

pinch open to zoom in

1. Uncap any suspect cells.
2. Hold the frame by the lugs at either end of the top bar and turn it upside down.
3. Position the sun or a source of artificial light behind you so that it shines into the cells.
4. Manipulate the frame up and down so that you can clearly see the base or the content of the cells.
5. 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.
6. Look for the thin hair like structure that is the remains of the tongue in pupal scale.
7. The red stick in the photo below is inserted in a cell and shows the correct angle between eye and frame.