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Christine Brazell When it comes to German cockroaches in public housing, managing heavy infestations to get them under control is no picnic. Housing authority contracts tend to go to the lowest bid, selling pest management services short and putting technicians in a precarious situation.
Can you imagine how much time it takes to do that? Lack of bait volume is the number one reason why we have these spectacular infestations. Another challenge includes massive amounts of clutter.
Miller and her crew of students set out to find different techniques to manage application speed and bait distribution out in the field to deal with these severe infestations. Her research is typically funded Aib exam guide part by manufacturers to test their products or those in development.
Tops on the list is a removable plastic tube that catches loose bait drips inside the holster making it easy to keep clean, the firm says. For more information visit www. Turnover every two years would mean the units would be repainted, and it was obvious to Miller that much of the residue had been there for a long time.
Wanting to find apartment complexes that were very infested, Miller and her team hit the jackpot with the RRHA. There are sanitation problems, water issues, clutter and the cockroaches have a lot of access to food.
They are treating units working eight hours a day per week. That means this technician is checking 92 units per day, 12 units every hour and spending 5 minutes per unit — including walking in between units, opening doors, taking breaks, etc.
In April Aib exam guide, Miller and team placed three sticky traps in each unit for 24 hours: They returned the next day to pick up the traps and count the cockroaches.
She used large, low-laying traps so she could see the differences between units. Students collected the traps to determine baseline infestations, counted 8, cockroaches in 83 units and selected 40 of those units for testing.
For statistical replication each formulation was to be used in two different buildings and no building would have more than one bait. The team planned to put bait out and monitor at days 3, 7, 14, 30, 60 and Soon after, Miller learned the manufacturer would not be able to supply the experimental bait until July.
Since the contract pest management company was to conduct a quarterly treatment in June, Miller was concerned that treatment would ruin the testing and felt it was best to look for another site.
These units posed a new challenge due to shower stalls that had been remodeled with vinyl covering, which was a major source of infestation.
We trapped an average of cockroaches per unit over a hour period. Shortly after the bait was available, Miller learned that the RRHA was still experiencing heavy infestations and wanted her team to come back and continue where they left off.
On Day 1, all units received 30 grams of bait. Additional bait was applied on Day 14, depending on the infestation level see Table 1, on the right.
They also cut up straws and placed bait inside. They were able to tape these horizontally above kitchen windows, to sink cabinets and under microwaves.
And there were enough cockroaches crawling around that I promise you in 24 hours we had no bait left. The company had been using one of the same bait formulations, and when residents saw that Miller and her team was using it, they doubted its effectiveness.
I said give me three days. They were impressed, and after three days, everybody loved us. In Richmond, by Day 60 using all of the bait formulations, they had a 90 percent decrease in population; Petersburg saw a 70 to 90 percent decrease. Trapping also had an impact on population levels.
In Richmond, trapping alone removed more than 47, cockroaches from April through July.
In Petersburg, trapping removed nearly 46, in 30 days, due to the summer increase in population. Even in the controls there was a decrease as the sticky traps were taking out enough cockroaches to have an impact.
Using heavy bait volume worked very well, and this was during summer. Miller says that previous failures to reduce the population were not due to bait failure, but due to lack of bait volume, and the bait burritos and cockroach cannolis were key to getting bait distributed in a timely fashion.
To get the reductions Miller and her team required an average application of 50 grams per unit over the course of two applications. The average application rate was 10 minutes to apply 20 grams in a unit. Finally, a January start would reduce overall costs. They need to start treatment using monitoring to identify the top 25 worst units for first three months, and treat only those units.
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