Figure 3-5. Fly counting grill.
c. Fly Cone Surveys. Fly cones (see figure 3-6) are superior to baited traps
and fly paper strips because they make use of many different natural attractants instead
of depending upon standard introduced attractants. The fly cone, made of screen wire,
is placed over a natural attractant (garbage, manure, and so forth) and flies are trapped
beneath it. A dark cloth is thrown around the cone and the apparatus is carefully
agitated. Attempting to escape, the flies move upward toward the Iight and enter the
cage; then the sliding door of the cage is closed and the collection is labeled.
Figure3-6. Fly cone.
MD0170
3-12
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