San Diego County, San Diego Rat Control Situation:
Hi David, Is a UV blacklight still useful, exterior-wise, if it rains after the rodents leave their urine stains? I am in the process of performing exterior maintenance to better exclude my roof rats. 1) I have a 25 year old cedar shake roof in San Diego California with openings under each shake along the rake edge of the roof at the gable ends of my house. There's no drip edge, i.e. under the shakes I have roofing paper (now somewhat curled) that runs more or less up to and rests right atop the fascia board. Because I have skip sheathing, and since the cross section of a shake is a wedge that is up to one inch at the upper, thick end, this appears to create many huge entry points along the rake edges even though the sheathing is rabbeted into the fascia board. As a result, I'm thinking of getting a UV blacklight to use outside the house to sleuth for urine stains along the upper edge of the gable end shakes and fascia boards. My question is, how easily does the winter rain wash away the urine, rendering this a pointless exercise? 2) I noticed a new product called "rat-out gel" and was thinking of applying it along the rake edges mentioned above. Or, maybe I should just buy many rolls of X-Clude and use that instead. Or maybe both. Any comment? Thanks very much for your website, Doug
My response: First off, I do not have experience using UV lights to detect rat urine. But I do suspect that rain will severely limit the effectiveness of this approach. I have never heard of Rat-Out Gel or XClude, but I typically stick to physical barriers rather than repellent type devices. If your roof makes this impossible, you might have a tough time keeping the rats out.
San Diego Rat Control Tip of The Week
Will Rats Hide From People?
The survival instinct of rats leads them to be cautious animals. The fear of being eaten by other predators makes them live in dark places and avoid being seen in broad daylight. People who come in contact with a rat may have several reactions, but the most common one is panic trying to shoo it away or kill it with whatever they have on hand. This situation causes fear in rodents who will look for hiding places and avoid being seen again.
The Mystery Of Smell
Rats use their powerful sense of smell as an effective survival technique. Through odors, a rat can perceive a predator, including species that are still unknown to the animal. Surprisingly, rats flee from cats not only because they know they may be eaten, but also because cat saliva contains chemicals that cause fear when rodents detect them.
Rats Are Pests To Humans
Farmers usually farm in warm places with relative humidity. Likewise, city dwellers tend to have a busy lifestyle, so their environment can quickly lead to clutter and disorder. Both scenarios are perfect for rodents who need the shelter and food provided by a barn, a dump, a messy house, or a sewer.
Rats are quite practical and, if necessary, can adapt to living anywhere, even in a somewhat messy house. The conditions for living comfortably and reproducing are emphasized in people's homes.
Human beings can unknowingly provide rodents with everything they need to survive, turning them into a pest. Rats, being able to take advantage of everything, from rigorously stored food to napkins thrown away, are able to grow as a population. The main consequence of a growing rodent population is the damage to people's health.
