Pests & Diseases

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sooty mold
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Sooty Mold

Grows on plants and other surfaces covered with honeydew, a sticky substance created by some certain insects. Doesn’t infect plants, but the mold can indirectly do damage by coating leaves to the point that sunlight can’t reach the leaf surface. Without adequate sunlight, the plant cannot effectively…
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verticillium wilt dahlias
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Verticillium Wilt

Verticillium Wilt, one of the most widespread and destructive soil-borne diseases of plants, attacks many woody and herbaceous species throughout the world. The causal fungus, verticillium dahliae, infects susceptible plants through the roots and invades and plugs the water conducting tissues. Verticlllium…
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mosaic Virus
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Zucchini Yellow Mosaic Virus

Virus transmitted by aphids. After feeding on an infected plant, aphids are only able to transmit this virus for very short periods of time (minutes to a few hours). In general, spread of potyviruses in the field occurs when aphid activity is high and is often very rapid and localized. …
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Deer
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Deer

Two most common are mule deer and black-tailed deer. Both eat shrubs, vines, fruit and nut trees, garden vegetables, grasses, and small flowering plants. Deer dislike some plants, especially when other more palatable plants are available.Signs/SymptomsHoof prints two to three inches long, split in the middle…
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Gopher
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Gophers

 Small burrowing rodents that feed on roots of plants. A single gopher can inflict considerable damage in a short time. They live up to three years and eat a wide variety of vegetation, usually what they encounter while digging. Sometimes feed above ground, venturing only a body length or so from their…
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raccoons
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Raccoons

Smart, dexterous, and can become very aggressive when cornered. When searching for den or food, they can be extremely destructive to homes and gardens. Communicate using a variety of sounds including purring, growling, hissing, and whistling. Eat plants and animals, including berries, nuts, acorns, pet food,…
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skunk
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Skunks

Triangular-shaped head, short legs and long, sharp, non-retractable claws. Spray can be squirted accurately as far as six to 10 feet away as a defense mechanism. Live in burrows. Eat a varied diet. Excellent sense of smell and good hearing, but very poor vision. Healthy skunks are mild-tempered. They prefer…
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Gopher
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Pest Profiles: Vertebrates

Solving Problems | Top 20 Problems | Garden Pests | Weeds & Invasives | Extreme Conditions | Other Garden Problems | Biological Control & Natural Enemies | Reducing Harmful Chemicals in the Garden Vertebrate Pests - Birds, Mammals, and Reptiles A vertebrate is an animal with a backbone…
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thrips
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Pest Profiles: Invertebrates

Solving Problems | Top 20 Problems | Garden Pests | Weeds & Invasives | Extreme Conditions | Other Garden Problems | Biological Control & Natural Enemies | Reducing Harmful Chemicals in the Garden Invertebrate pests – insects, spiders and mites, snails, and slugs An invertebrate is any…
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Ask Our Helpline

Something in your garden or home bugging you? Do your roses have strange spots? Is something eating your tomatoes? The Merced Master Gardeners are here to help! Contact our Helpline to get answers to your garden challenges and pest problems. Send an email to anrmgmerced@ucanr.edu.
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