Tessera

UC IPM - Urban & Community

@ucipmurban.bsky.social

Helping Californians manage pests in the home, garden, and landscape using safer and more sustainable methods. 🪴🐞🏡🧪 University of California IPM Program (UC IPM) https://ipm.ucanr.edu/

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UC IPM - Urban & Community @ucipmurban.bsky.social · 2w ago

Join us for this special webinar on July 30th to learn about the recent changes to the UC IPM website. We’ll review updates to the Home & Landscape section, how to navigate the website, and what other improvements are coming. Register: ucanr.zoom.us/webinar/regi...

Text reads, “Free IPM Webinar: Exploring UC IPM’s Website Changes. July 30, 12-1pm:” In the background you see a dark brown and orangish adult hover flyer on a pink five petaled flower with a yellow center.

UC IPM - Urban & Community @ucipmurban.bsky.social · 2w ago

UC IPM - Urban & Community @ucipmurban.bsky.social · 4w ago

Tune into our next webinar on July 16th, where we’ll be joined by Citrus IPM Advisor Dr. Sandipa Gautam, for an update on the Asian citrus psyllid. Link to register: ucanr.zoom.us/webinar/regi...

Text reads, “Free IPM Webinar: Update on Asian Citrus Psyllid in California. July 16, 12-1pm.” In the background you see a small moth-like insect (adult Asian citrus psyllid) with wings broadest in the apical half, mottled, and have a dark brown band around the outer half laying yellow almond shaped eggs on green leaves.

UC IPM - Urban & Community @ucipmurban.bsky.social · 3w ago

Earwigs, while not harmful to humans, can cause quite the ruckus in home gardens. Read our latest blog article to learn more about earwigs and what you can do to control them: ucanr.edu/blog/pests-u...

Text reads “Got earwigs in your garden?”. In the background you see an adult European earwig on a green leaf.

Text reads “Earwigs, sometimes also called pincherbugs, can be damaging or just a nuisance around our homes and gardens. They feed at night, damaging seedlings and chewing holes on vegetables, flowers, sweet corn, or plants with soft fruits.” In the background you see two images. One image is a close-up of an earwig eating at an apricot. In the other image you see damage to a seedling done by an earwig.

Text reads “Successful management of earwigs involves multiple actions, including trapping and sanitation. For more on how to control earwigs, check out our latest blog article!” In the background you see a low-sided can sunk into the ground and filled with vegetable oil and a drop of fish oil, typically used to trap earwigs in the garden.

UC IPM - Urban & Community @ucipmurban.bsky.social · 4w ago

Aquatic invasive species are a growing threat to California waterways. Learn more about what they are, how they spread, and what you can do to protect California’s waters in our latest blog article: ucanr.edu/blog/pests-u...

Text reads “Protect California from Aquatic Invasive Species!”. In the background you see hydrilla in the water.

Text reads “What are aquatic invasive species? Aquatic invasive species are non-native plants, fish, and mussels that live in fresh or marine water. They can cause harm in the environment, impact the economy, or negatively affect human health. Visit our blog to learn more about aquatic invasive species and what YOU can do to protect California’s waterways!”. In the background you see a picture of golden invasive mussels on a rock.

UC IPM - Urban & Community @ucipmurban.bsky.social · 4w ago

Tune into our next webinar on July 16th, where we’ll be joined by Citrus IPM Advisor Dr. Sandipa Gautam, for an update on the Asian citrus psyllid. Link to register: ucanr.zoom.us/webinar/regi...

UC IPM - Urban & Community @ucipmurban.bsky.social · last mo.

July is here! Use the Seasonal Landscape IPM Checklist to help you figure out what to do in your region each month to keep your landscapes healthy and pest-free! Visit the UC IPM website to use this tool: ipm.ucanr.edu/home-and-lan...

Text reads “IPM Tips for July. Clean up fallen fruit or nuts to avoid attracting or harboring pests. Check your vegetable plants for aphids and their natural enemies. Spray aphids with a strong stream of water to knock them off sturdy plants. Cover fruit trees with netting to exclude birds and other vertebrate pests. Maintain a fire safe landscape. Thin out thick vegetation and eliminate fuel ladders that allow fire to climb up trees or structures.” In the background you see yellow flowers and a fruit tree growing in a home landscape.

UC IPM - Urban & Community @ucipmurban.bsky.social · last mo.

Pruning is considered a form of IPM and can be helpful in maintaining a tree’s structure and health. To learn more about proper tree pruning, including timing, different pruning approaches, and how to prevent disease spread, read the full article on our blog: ucanr.edu/blog/pests-u...

The text reads “Pruning and tree physiology”. In the background you see sunlight streaming through the leaves of a tree canopy.

The text reads “Effects of pruning on tree physiology: Reduces the tree’s ability to capture energy because there are fewer leaves. Reduces stored energy reserves when branches are removed. Changes the growth pattern of a tree since more water and nutrients are directed into shoots left after pruning.” Above the text you see a picture of someone pruning stems with bypass pruners with red handles.

The text reads “Effects of pruning on tree defense systems: Pruning affects a tree’s ability to resist pathogens and insects in both direct and indirect ways. Pruning wounds present a way for pathogens to get into trees. Large-scale pruning reduces stored energy reserves, limiting the tree’s capacity to defend itself from insects or pathogens.” Next to the text you see a picture of a tree wound colonized by a heart rot decay fungus after a large avocado limb was pruned.

The text reads “Tips for pruning: (1) Prune small - prune often! and limit the total amount of branches removed. (2) Prune well! by making correct cuts; with clean tools; timed to avoid insects and diseases; and disposing of pruned material appropriately. (3) Respect the natural form! by remembering that we can’t make a round-headed redwood by pruning or a pole-like coast live oak without severely stressing the tree. In the background you see sunlight streaming through the leaves of a tree canopy.

UC IPM - Urban & Community @ucipmurban.bsky.social · 2mo ago

Vegetable plants can get diseases just like people or other animals do, making them appear "sick". Visit our blog, to learn about the types of diseases and disorders that can affect your vegetable garden and how to manage them: ucanr.edu/blog/pests-u...

Text reads, “ Vegetable Garden Diseases & Disorders”. In the background you see a sweet pea plant with powdery mildew.

Text reads, “Common Diseases of Vegetables. Downy mildew: Symptoms appear as necrotic (dead) or chlorotic (yellow) patches on the top of leaves. Spores are produced on the undersides of leaves, forming white to brown velvety patches. Soft rot: Plant becomes water-soaked, mushy, and can have a foul-smelling odor. Mosaic Viruses: Symptoms include leaf twisting and distortion, a chlorotic mosaic pattern, and stunting.” In the background you see: head of cabage with necrotic and chlorotic patches, showing signs of downy mildew; cross sections of garlic bulbs showing rot of inner scales; and the leaves of a squash plant showing a chlorotic mosaic pattern.

Text reads, “Common Disorders of Vegetables. Sunscald and heat disorders: Symptoms include tip-burning of leaves, wilting, leaf-rolling, and dropping of blossoms. Blossom-end rot: Causes the end of immature fruit to have sunken brown or black lesions as fruit ripen. Read more about all the types of diseases and disorders that can affect your vegetable garden on our blog!” In the background you see: a watermelon showing signs of sunscald and heat distress; a tomato plant exhibiting symptoms of blossom-end rot.

UC IPM - Urban & Community @ucipmurban.bsky.social · 2mo ago

Last month, we announced that some resources would be temporarily be removed from the UC IPM website to comply with federal accessibility requirements. Since then, the deadline has been extended and our tools are available once again! To read the full update, visit: ucanr.edu/blog/pests-u...

Text reads, "UC IPM Tools are Back Online". In the background you see a home landscape with orange and purple flowers and some shrubs and trees in the foreground.

Text reads, “Certain online resources and tools that had previously been taken down from the UC IPM website are available once again! This includes: Plant Pest Diagnostic Tool; Wildlife Pest Identification Tool; Key to Identifying Common Household Ants; Key to weeds in turf and landscapes; UC Guide to Healthy Lawns; More to follow!” In the background you see a home landscape with orange and purple flowers and some shrubs and trees in the foreground.

UC IPM - Urban & Community @ucipmurban.bsky.social · 2mo ago

Want to learn more about how to manage pests when they arrive in your compost? Join us on June 18th to learn about the common mishaps to avoid when composting and how to deal with those pesky pests! Register for this free IPM webinar: ucanr.zoom.us/webinar/regi...

Text reads, “Free IPM webinar: When Composting Goes Rotten. June 18th, 12pm-1pm.” In the background you see an assorted variety of decomposing fruits and veggies in a compost bin.

UC IPM - Urban & Community @ucipmurban.bsky.social · 2mo ago

Invasive pest prevention is a year-round effort! As California Invasive Species Action Week wraps up, remember these simple actions you can take to help. Visit the UC IPM blog to read the full article: ucanr.edu/blog/pests-u... #CISAW #InvasiveSpecies #California #InvasivePests

Text reads, “California Invasive Species Action Week: What Can You Do? Don’t pack or plant a pest! Avoid accidentally transporting pests on fruits, vegetables, plants, seeds, or firewood. Be on the lookout! Keep an eye out for invasive species and report to the California Department of Food and Agriculture (CDFA). Recreate responsibly. Clean, drain, & dry to avoid unintentionally spreading aquatic invasive species.” In the background you see big periwinkle foliage and flowers.

UC IPM - Urban & Community @ucipmurban.bsky.social · 2mo ago

Aquatic invasive species like golden mussels are threatening California’s lakes and rivers by impeding water delivery systems, damaging recreation areas, and harming wetland ecosystems. Visit the California Department of Fish and Wildlife’s webpage to learn more: wildlife.ca.gov/Conservation...

Text reads, “California Invasive Species Action Week 2026: Invasive Pest Spotlight: Golden Mussels. Bivalve mollusk about the size of a thumbnail (up to 1 and ¾ inch long), dark brown to gold in color. Lives in fresh or brackish water. Clogs pipes, boat motors, and other man-made objects. Causes problems with water delivery, flood control, the environment, and recreation. In the background you see dark brown bivalve mollusks.

UC IPM - Urban & Community @ucipmurban.bsky.social · 2mo ago

Rats are among the most troublesome and damaging rodents in residential areas. Roof rats can travel up to 300 feet or more for food! Read more about roof rats and what you can do to manage them on the UC IPM website: ipm.ucanr.edu#gsc.tab=0 #CISAW #InvasiveSpecies #California #InvasivePests

Text reads, “California Invasive Species Action Week 2026: Invasive Pest Spotlight: Roof Rats. Nests in enclosed elevated spaces, such as attics, wall voids, ceiling voids, and cabinets. Eats a variety of foods, but prefers fruits, tree nuts, berries, slugs, snails, young birds, and bird eggs. Can cause problems by gnawing on electrical wires and wooden structures, and by shredding insulative materials in walls and ceilings for use in their nests. Has the potential to carry and transmit diseases to people, their pets, and livestock. In the background you see an adult roof rat, with light brown fur, large ears and eyes, pointed nose and a tail longer than the head and body.

UC IPM - Urban & Community @ucipmurban.bsky.social · 2mo ago

The invasive shothole borer (ISHB) are tiny beetles that attack trees and infect them with a fungal disease. Destructive pests like these are often moved to new areas on infested firewood. To learn more about ISHB, read our latest blog post: ucanr.edu/blog/pests-u...

Text reads, “California Invasive Species Action Week 2026: Invasive Pest Spotlight: Invasive Shothole Borer (ISHB). Tiny wood-boring beetles that “farm” and eat a fungus (Fusarium species) inside susceptible trees. 3 known species in California. Many tree species are hosts, and some tree hosts can be killed by the Fusarium fungi including maples, California sycamore, and valley oak. Found mainly in coastal areas in Southern CA, but in the last few years, detected in Northern CA.” in the background you see an adult female invasive shothole borer. The beetle is small and cylindrical, with clear short bristles on its back and brown club-shaped antenna.

UC IPM - Urban & Community @ucipmurban.bsky.social · 2mo ago

The glassy-winged sharpshooter (GWSS) is a large leafhopper that can transmit a bacterium which causes a fatal grapevine disease (called Pierce’s disease). Check our blog to learn more about GWSS and the recent detection in NorCal: ucanr.edu/blog/pests-u... #CISAW #InvasiveSpecies #California

Text reads, “California Invasive Species Action Week 2026: Invasive Pest Spotlight: Glassy-winged Sharpshooter (GWSS). Large, dark brown leafhopper insect (adults 1/2 inch long) that sucks out the plant juices. Can transmit the bacterium that causes Pierce’s disease, a deadly disease of grapevines. Found in Southern California and parts of the San Joaquin Valley, though localized infestations have occurred in other parts of the state. Recently detected on grapevines sold at select Northern California Costco’s.” In the background you see an adult glassy-winged sharpshooter and (out-of-focus nymph on a green lemon twig.

UC IPM - Urban & Community @ucipmurban.bsky.social · 2mo ago

Help raise awareness of invasive species by participating in the California Invasive Species Action Week (CISAW) held June 6-14, 2026! 🪲 Join us this week to learn about important invasive species, their impacts, and actions you can take. Read the full blog post here: ucanr.edu/blog/pests-u...

Text reads, “California Invasive Species Action Week (CISAW) is June 6-14, 2026! There are many ways to help manage and prevent the spread of invasive species. Even small actions can make a big difference!” In the background you see Pampas grass an invasive ornamental plant.

UC IPM - Urban & Community @ucipmurban.bsky.social · 2mo ago

Re-post from the California Department of Food and Agriculture (with an updated list of impacted counties): Did you buy a grapevine at a Northern California Costco between April 21 and May 19? Learn what to do right now and get all of the details here: bit.ly/GWSS-Costco

Text reads “Did you buy grapevines from a Nor Cal Costco? It could have an invasive insect that spreads a disease fatal to plants! Costco is not at fault and is cooperating with our response. What to do:” Picture in the background of a glassy-winged sharpshooter (GWSS). White arrow pointing to the right.

Text reads “If you bought grapevines from a Northern California Costco between April 21 and May 19: (1) ISOLATE THE PLANT: Keep the plant in its original pot or container and away from other plants; Do not put the plant in the ground if you haven't already; If possible, place the plant in two trash bags, one inside the other, and seal them closed; Do not return, transport or relocate the plant; Do not place the plant in the trash or compost bin.

If you bought grapevines from a Northern California Costco between April 21 and May 19: (2) CONTACT YOUR LOCAL COUNTY AGRICULTURE DEPARTMENT: An agricultural inspector will come to look at the plant and other nearby host plants. If inspectors find GWSS on the grapevine, they will safely remove the pests) and dispose of the plant. GWSS monitoring traps may be placed on the property. Contact your local ag department: bit.ly/GWSS-costco.”

Text reads “Impacted Costcos as of 5/28/2026 at 1:00 p.m. Alameda County, Butte County, Contra Costa County, Humboldt County, Kings County, Marin County, Mendocino County, Merced County, Monterrey County, Napa County, Placer County, Sacramento County, San Joaquin County, San Mateo County, Santa Clara County, Santa Cruz County, Shasta County, Solano County, Sonoma County, Stanislaus County, Yolo County, Yuba County. Contact your local ag department: bit.ly/GWSS-costco.”

UC IPM - Urban & Community @ucipmurban.bsky.social · 2mo ago

Glassy-winged sharpshooter (GWSS), an invasive pest, has been found on grapevine shipments sold at select Costco locations in Northern California between April 21 and May 19, 2026. Visit the UC IPM blog to read the full update: ucanr.edu/blog/pests-u...

Text reads ”Pest Alert! Glassy-winged sharpshooter (GWSS), has been found in Northern California. Glassy-winged sharpshooter, an invasive insect, has been found on grapevine shipments sold at select Costco locations in Northern California between April 21 and May 19, 2026.” In the background is an image of a glassy-winged sharpshooter adult and (out-of-focus) nymph on green lemon twig.

Text reads “GWSS has been confirmed on plants shipped to the following counties: Alameda, Marin, Placer, Sacramento, San Mateo, Solano, Stanislaus, Sutter, Yolo, Yuba. Officials are still evaluating additional suspect samples from several other counties: Butte, Contra Costa, Humboldt, Merced, Napa, Sonoma”. In the background is an image of a glassy-winged sharpshooter leafhopper adult on crape myrtle.

Text reads “What to do if you purchased a plant: Isolate the plant; contact your local County Agricultural Commissioner’s Office right away. Visit the UC IPM blog to read the full update. Help share the word to limit the spread of this insect and the disease it carries.” In the background is an image of a glassy-winged sharpshooter next to brown-lined lump of egg blister on lower leaf surface.

UC IPM - Urban & Community @ucipmurban.bsky.social · 2mo ago

As many uses of rodenticides are being restricted, dogs are being employed to help better detect rodent pest problems. Read our blog to learn more about JJ, a rodent detection dog and the work he does in the field of pest management: ucanr.edu/blog/pests-u...

A group of people listens to a speaker outdoors, with a dog in the foreground.

UC IPM - Urban & Community @ucipmurban.bsky.social · 3mo ago

Jump into summer with these FREE IPM webinars! Join us every month from 12:00 to 1:00pm. Get answers to your pest questions and learn about pest identification, prevention, and management around the home, garden, and landscape! Register at: ucanr.edu/site/urban-c...

UC IPM - Urban & Community @ucipmurban.bsky.social · 3mo ago

Emerald Ash Borer (EAB) Awareness Week is May 17-23, 2026! Tune into a free webinar hosted by the organization Don’t Move Firewood to learn about this invasive pest. Visit dontmovefirewood.org/eabweek2026 to sign up for a free webinar.

Image of a tree showing symptoms of Emerald Ash Borer infestation, overlayed with the text "Webinar Alert! May 19, 20, 21. Don't Move Firewood Emerald Ash Borer Awareness Week Webinar Series 2026. Register at dontmovefirewood.org/eabweek2026."

UC IPM - Urban & Community @ucipmurban.bsky.social · 3mo ago

What’s that pest?! Join us for this interactive webinar on May 21st where we will “quiz” attendees on look-alike pests, causes of plant damage, good bug vs. bad bug, weed ID, and more. Register at ucanr.zoom.us/webinar/regi...

A photo of green peach leaves with thick, puckered greenish and red spots with text that says “Free IPM webinar: Test Your Pest ID Knowledge. May 21, 12:00-1:00pm."

UC IPM - Urban & Community @ucipmurban.bsky.social · 3mo ago

Conditions are perfect for fire blight, a damaging disease of pome fruit trees and their relatives. 🌳🍎 To learn how to keep an eye out for and manage this garden pest, visit our blog: ucanr.edu/blog/pests-u... #ipm #gardening

A photo of apple tree foliage with patches of dead, brown leaves affected by fire blight with text: “Look out for fire blight!”

A photo of a black, wilted pear blossom impacted by fire blight and text: “Fire blight is a bacterial disease that can infect pome fruit trees like pear and apple. Recent warm weather followed by rain means conditions are ideal for this disease. Visit our blog for more information on identifying and managing fire blight!”

UC IPM - Urban & Community @ucipmurban.bsky.social · 4mo ago

Spring has arrived! 🌼 Along with warmer weather and blooming flowers, you may have also noticed more insects and spiders roaming your home. If these unwanted houseguests have you thinking about clearing up some clutter, tune in on April 16, 2026. Register at ucanr.zoom.us/webinar/regi...

A photo of a bright yellow daffodil with text that says “Free IPM webinar; Spring Cleaning: Where Indoor Pests Could Be Hiding; April 16 12:00 to 1:00pm.”

UC IPM - Urban & Community @ucipmurban.bsky.social · 4mo ago

Spring has arrived! 🌱 Along with warmer weather and blooming flowers, you may have also noticed more insects and spiders roaming your home. If these unwanted houseguests have you thinking about clearing up some clutter, tune into our next webinar on April 16, 2026: ucanr.zoom.us/webinar/regi...

Children's artwork, with a plastic googly eye, white yarn, and other decorations glued to pink construction paper, infested with small, fuzzy, white and black carpet beetle larvae. Text on top of the image says "Free IPM Webinar: Spring Cleaning: Where Indoor Pests Could Be Hiding, April 16 12:00 - 1:00pm.

UC IPM - Urban & Community @ucipmurban.bsky.social · 4mo ago

With citrus season in full swing, there are pests you should be on the lookout for. 🍊🍋🐛 Read more about how to identify these pests, their damage, and how to manage them on our blog: ucanr.edu/blog/pests-u... #IPM #gardening

Several green, unripe citrus fruits hanging from a branch with many blotchy yellow and green leaves indicating disease. Also, text that says "When life gives you citrus (and pests)... Swipe right to learn more about pests that can affect your citrus trees.

Two circular photos with images of pests, next to text describing the damage they cause to citrus trees. The first photo is a close-up of a light green citrus leaf with a dark, serpentine tunnel visible underneath the surface of the leaf where a leafminer larva has burrowed, and an adult leafminer, which is a small, slender, silver-colored moth with feathery wing tips. The accompanying text box says “Citrus Leafminer: Citrus leaves damaged by citrus leafminer larvae are rolled and distorted.” The second photo is of a white, fuzzy cottony-cushion scale insect resting on a citrus tree twig. The accompanying text box says “Cottony-cushion scale: Damages citrus by sucking plant juices as they feed. Can produce profuse amounts of honeydew which attracts ants and allows growth of sooty mold.”

Two circular photos with images of pests, next to text describing the damage they cause to citrus trees. The first photo is a green, unripe citrus fruit covered with fuzzy, white, mealy-looking mealybug insects. The accompanying text says “Mealybugs: Like, cottony cushion scale, mealybugs damage citrus by sucking plant juices as they feed and can produce profuse amounts of honeydew which attracts ants and allows growth of sooty mold.” The second photo is a small, mottled brown Asian citrus psyllid insect feeding on a citrus twig at a 45 degree angle and blotchy yellow and green citrus leaves. The accompanying text says “Asian Citrus Psyllid (ACP): Damages citrus leaves by feeding on new leaf growth, causing the leaves to twist or notch as they mature. ACP can infect citrus trees with the deadly disease huanglongbing (HLB), which can kill a citrus tree in as little as 5 years.”

UC IPM - Urban & Community @ucipmurban.bsky.social · 5mo ago

Four-leaf clovers may be a sign of good luck, but some clovers can be a garden nuisance. 🍀 Visit our blog to learn more: ucanr.edu/blog/pests-u... #ipm #gardening #saintpatricksday

A text box with the words “Shamrocks, clovers, or weeds?” over a background of clover plants with deep green, compound leaves with three leaflets and pinkish-white, globe-like flowers.

UC IPM - Urban & Community @ucipmurban.bsky.social · 5mo ago

Join us on March 19th for a brief introduction to biopesticides — what they are, how they work, and how some have been discovered. You will also learn how to use them effectively as part of a sustainable pest management approach. 🌱🧪 Register at ucanr.zoom.us/webinar/regi... #ipm #gardening

A close-up of a large chrysanthemum flower with white petals, a textured yellow center, and green leaves with sharp lobes. Below the flower is text that says “Free IPM webinar: The Secret Life of Biopesticides, March 19 12:00 - 1:00pm.”

UC IPM - Urban & Community @ucipmurban.bsky.social · 5mo ago

In January 2026, Dr. Amy Murillo fascinated our webinar attendees about pests of backyard chickens. Visit the UC IPM blog for a link to the webinar recording and to read some answers from the live Q&A: ucanr.edu/blog/pests-u... Photo of Cheery Littlebottom the chicken by Belinda Messenger-Sikes.🐓

A large chicken with reddish-brown feathers tipped with white and a red comb and wattle standing on a fence with a white thought bubble and text that says “Oh no, do I have pests?!”