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- All about citrus
- Ornamental grasses
- Beneficial insects
- Preventing a codling moth invasion
- Stop snails in their tracks
- Winter garden color
- Caring for holiday gift plants
- Artichokes
- Propagating native plants
- Japanese maples
- Container gardening
- Growing gorgeous camellias
- Redwood trees
- Pomegranates: an ancient tree
- Bulbs for spring
- Nothing quite like a freshly picked bouquet
- Seeds hold the miracle of life, so save, swap and share them
- Sold on Salvia
- Sudden Oak Death: a million trees gone and counting
- Habitat gardens
- Growing In Your Garden Now - Fava Beans
- Using water effectively in the garden
- Yikes, thrips
- Growing a salad in a pot
- Rain gardens: an attractive solution to a challenging environmental problem
- How to select bare root roses
- Lovely birds... or pests?
- Australian plants in winter
- Get a head start on spring with cold frames
- Snails and slugs: keep them out of the garden
- Sow seeds now for flowers in spring and summer
- Fire-safe landscaping
- Plants made for the shade
- Chinese pistache tree glows in autumn
- Attracting honey and native bees to your garden
- Sow wildflower seeds in fall for spring show
- Native shrubs create a visual anchor in landscapes - fast
- What to plant in the fall-winter veggie garden
- Proper pruning of wisteria for a plethora of blossoms
- Compost for every corner of your spring garden
- All about mushrooms
- Butterflies in the garden
- Growing blueberries
- How to plant a fruit tree
- Protecting plants from frost
- What's that plant?
- Bright spots of color lift the drabness of the winter garden
- Books for Marin gardeners
- Benefits of School Gardens
- Trees: not just nice to look at
- Dealing with mosquitos
- Epilobium – California fuchsia
- Why bees matter, and how you can help
- Picking the Right Plant for the Right Place in Your Garden
- What's That Plant?
- Pollination
- Keeping Cut Flowers Fresh
- Late Summer Color
- Growing Summer Squash
- Short on space? Containers!
- Herbs: tough, attractive, practical
- These plants are true companions
- Companion planting in the vegetable garden
- Get Grounded – Healthy Soil Does Matter
- Mushrooms on the March
- Our Gentle Winters are Good for Vegetables
- Rodents like it Warm
- Know What Makes an Invasive Species Invasive
- California Natives - Plant Like a Native
- Consider a Simple Water-Catchment System and Rain Garden/Bioswale Before Winter Rains Arrive
- Have You Scheduled a FREE Bay-Friendly Garden Walk?
- A Green Autumn
- Rx for Pests: Ants
- Fine Tune Your Garden
- Colorful Drought-Tolerant Plants Thrive in Marin
- Water Restrictions and Recognizing Signs of Water Stress
- UC Researcher Is Helping Plants Survive the Drought
- Summer Is Perfect For Peppers
- Do the Leaves on Your Trees Look Scorched?
- Fine Tune Your Garden
- How to Recognize Drought and Water Stress
- Spring is the Time for Potatoes, Asparagus and Citrus
- Don't Let Stink Bugs... Bug Your Vegetables
- Harvesting Berries
- Water Heroes
- Natural Cold Storage
- Fruit Trees; Why We Treat Them in Dormancy
- Fondness for Old Friends
- What Happens to Garden Bad Guys in Winter?
- Plants that aren't blown away by the wind
- A hill o' beans
- Fruit tree thinning
- Fragrant plants: Add some chocolate or Kool-Aid to your garden
- Top 10 resolutions for Marin gardeners
- Trees with interesting bark shine in winter
- Who says your garden has to be green?
- Plant bulbs now for spring beauty
- Gardener's checklist for fall
- Cover crops boost soil in vegetable beds
- Rx: Living with deer
- Growing berries in Marin
- How to build healthy soil
- Gardener's checklist for summer
- Water-saving tips for the home garden
- Gardener's checklist for spring
- Stop the popping - Controlling hairy bittercress
- How to control aphids
- Brightening up the winter garden
- Selecting a fruit tree
- What to plant and harvest in the winter vegetable garden
- Rain, rain, don't go away
- Gardener's checklist for winter
- Getting rid of rats
- Fall: a time for planning and planting
- Asparagus: spears for years
- Lawn: use it or lose it
- Rx for powdery mildew
- Community Outreach Projects of UC Marin Master Gardeners
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Getting rid of rats
Rats are one of the most common pests in Marin County, destroying crops and wreaking serious havoc in the home and garden. They also elicit some of the most visceral reactions from gardeners, who find their beady-eyed presence downright creepy. But make no mistake: Marin is teeming with these unwelcomed critters.
On a brighter note, there are many strategies to both prevent and eradicate rats. The first step is to understand how and why rats show up and what they need to survive. Here’s how to beat them at their own game.
1. Know your enemy. There are two non-native rats that call Marin home: roof rats and Norway rats. The larger Norway rat (Rattus norvegicus), also known as brown, sewer or wharf rats, are stocky, with a blunt nose and a tail shorter than their body. Moving in an area up to 150 feet in diameter, Norway rats burrow along building foundations, beneath rubbish or woodpiles, and moist areas in and around gardens and fields. Indoors, they usually frequent the ground floor or the basement. Mostly nocturnal, their poor eyesight is offset with keen senses of hearing, smell, taste and touch. They constantly explore and learn about their environment, memorizing pathways, obstacles and locations of food and water.


2. Recognize the signs of infestation. The pitter-patter of tiny but speedy feet across your roof at dusk or dawn, birdseed that seemingly disappears overnight, tomatoes with chunks missing or large comma-shaped droppings all are indicators of rats. And you'll not likely see them, just their damage. They eat nearly any type of food: fruits, nuts, pet and bird food, fresh grain, meat and fish, even slugs and snails. They can gnaw through food containers, electrical wires, doors, walls and insulation. Burrowing types can undermine building foundations and slabs, damage garden crops and ornamental plantings.
3. Do not create inviting rat habitat. Most living creatures need food, water and shelter to survive. Rats are no different. They often show up in search of one or more of these requirements and end up staying when they find it. This is especially true when they find a food source. Here are some common ways of stopping a potential rat visit:
- Harvest or pick up fruit, nuts and vegetables as they ripen.
- Feed your pets during daylight and remove uneaten food right away.
- Keep garbage and recycling cans covered.
- Store bulk foods, birdseed and dry pet food in rat-proof, covered metal containers.
- Use rodent-proof birdfeeders.
- Remove excess garden debris.
- Trim trees, shrubs and vines to at least 4 feet away from roofs and utility poles.
- Thin heavy vegetation from around buildings or fences.
- Stack wood and household items at least 18 inches above the ground and 12 inches from fences and walls.
- Seal any opening larger than the size of a dime with rodent-proof material such as metal, hardware cloth, mortar, concrete or copper mesh wool.
- Weatherstrip front, side and garage doors so they close tightly.
- Repair damaged ventilation screens.
4. Get a handle on an infestation quickly. If you need to eliminate rats, trapping is environmentally safe and effective. Large snap traps are inexpensive and can be reused. Location is crucial to their effectiveness: place them in natural travel ways so the rodents will have to pass over them. Put the short side of the trap containing the trigger against the wall or runway. Setting multiple traps 10 to 20 feet apart will improve the chances of catching one. Bait the trap with nuts, dried fruit, pet food or bacon, and secure it to the trigger with light string, fine wire or even glue. Leaving traps unset with unsecured bait until the bait has been taken at least once can improve trapping success.
There are many readily available poison bait products that kill rats or any other animal that may consume it directly (like a dog or cat). Unfortunately, these products can also inadvertently injure or kill animals that may eat a poisoned rat, and symptoms of poisoning may take hours or days to see. When used indoors, the animal may die within wall or attic spaces resulting in significant odor problems and a swarm of flies.
Rats are potential vectors of disease, so do not touch a dead rat with bare hands and wash hands thoroughly after handling traps. Wearing protective gloves, place a dead rat in a plastic bag, seal it and place it in your garbage can.
Learn more about how to get rid of rats from the University of California Integrated Pest Management online resource. The Marin/Sonoma Mosquito and Victor Control District is another good source of rat control information, including their rat control pamphlet.
Contributors:
Nanette Londeree, Marie Narlock