2001 Summer Employment
Alyce NeJame, Jerry Hogsette, Mentor
Alyce NeJame was involved in two projects this summer. The first involved
testing of solid baits used to combat house flies. The tests were conducted
in aluminum screen cages (above) with baits composed of varying ratios
of boric acid and sugar.
The solid bait containers.
Alyce's second project examined the effectiveness of a new trap for
flies and mosquitos, called the BugJammer. This device produces the sound
of a beating heart (dog or human), and may emit carbon dioxide, heat,
or light, depending on the model.
The BugJammer unit with stable flies and house flies
stuck to the adhesive
Efficacy of Boric Acid Granular Baits
on Musca domestica
of boric acid granular baits was tested in this experiment. Concentrations
ranging from 3% to 33% were tested. The hypothesis was that the 9% concentration
would be the most effective to produce 50% mortality in the least amount
of time. This assumption was made based on last year's experimentation
where the 8% concentration of boric acid bait worked the best. Probit
analysis showed that the LD50 (lethal
dose to kill 50 percent of the population) was essentially 9%, based
on the data collected.
The baits were mixed
in a liquid form and then freeze dried. The experiment was set up with
7 standard (35 x 45 x 35 cm high) fly cages with 25 female house flies
(Musca domestica L.), 5 to 6 days old and starved for 4 hours,
in each. A 150 ml beaker containing 140 ml of water was placed in the
front left corner of each cage. The bait was weighed out at approximately
1 g per concentration, placed in aluminum weigh boats, and placed in
the rear right corner of the cages. The flies were released and mortality
was recorded at 24, 48, 72 and 96 hours after release time.
The results were not
as predicted in the hypothesis. After analysis by probit analysis (SAS),
the LD50 was shown to be ~14 percent
boric acid. The concentration tested that was closest to the LD50
was 17 percent. Therefore, this was the concentration used to calculate
the LT50, which was ~53 hours.
is being planned with several tests to determine if color or scent has
a positive effect on the efficacy of the baits. Also, is there a level
at which the boric acid concentration becomes repellent to the flies?
Currently, data are being collected on how long the flies have to be
exposed to the bait.
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